HttpHeaders (Spring Framework 5.3.39 API)

java.lang.Object
- org.springframework.http.HttpHeaders

All Implemented Interfaces:

Serializable, Map<String,List<String>>, MultiValueMap<String,String>

Direct Known Subclasses:

WebSocketHttpHeaders
```
public class HttpHeaders
extends Object
implements MultiValueMap<String,String>, Serializable
```
A data structure representing HTTP request or response headers, mapping String header names to a list of String values, also offering accessors for common application-level data types.
In addition to the regular methods defined by Map, this class offers many common convenience methods, for example:
- getFirst(String) returns the first value associated with a given header name
- add(String, String) adds a header value to the list of values for a header name
- set(String, String) sets the header value to a single string value
Note that HttpHeaders generally treats header names in a case-insensitive manner.
Since:

3.0

Author:

Arjen Poutsma, Sebastien Deleuze, Brian Clozel, Juergen Hoeller, Josh Long, Sam Brannen

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K,V>

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`ACCEPT` The HTTP `Accept` header field name.
`static String`	`ACCEPT_CHARSET` The HTTP `Accept-Charset` header field name.
`static String`	`ACCEPT_ENCODING` The HTTP `Accept-Encoding` header field name.
`static String`	`ACCEPT_LANGUAGE` The HTTP `Accept-Language` header field name.
`static String`	`ACCEPT_PATCH` The HTTP `Accept-Patch` header field name.
`static String`	`ACCEPT_RANGES` The HTTP `Accept-Ranges` header field name.
`static String`	`ACCESS_CONTROL_ALLOW_CREDENTIALS` The CORS `Access-Control-Allow-Credentials` response header field name.
`static String`	`ACCESS_CONTROL_ALLOW_HEADERS` The CORS `Access-Control-Allow-Headers` response header field name.
`static String`	`ACCESS_CONTROL_ALLOW_METHODS` The CORS `Access-Control-Allow-Methods` response header field name.
`static String`	`ACCESS_CONTROL_ALLOW_ORIGIN` The CORS `Access-Control-Allow-Origin` response header field name.
`static String`	`ACCESS_CONTROL_EXPOSE_HEADERS` The CORS `Access-Control-Expose-Headers` response header field name.
`static String`	`ACCESS_CONTROL_MAX_AGE` The CORS `Access-Control-Max-Age` response header field name.
`static String`	`ACCESS_CONTROL_REQUEST_HEADERS` The CORS `Access-Control-Request-Headers` request header field name.
`static String`	`ACCESS_CONTROL_REQUEST_METHOD` The CORS `Access-Control-Request-Method` request header field name.
`static String`	`AGE` The HTTP `Age` header field name.
`static String`	`ALLOW` The HTTP `Allow` header field name.
`static String`	`AUTHORIZATION` The HTTP `Authorization` header field name.
`static String`	`CACHE_CONTROL` The HTTP `Cache-Control` header field name.
`static String`	`CONNECTION` The HTTP `Connection` header field name.
`static String`	`CONTENT_DISPOSITION` The HTTP `Content-Disposition` header field name.
`static String`	`CONTENT_ENCODING` The HTTP `Content-Encoding` header field name.
`static String`	`CONTENT_LANGUAGE` The HTTP `Content-Language` header field name.
`static String`	`CONTENT_LENGTH` The HTTP `Content-Length` header field name.
`static String`	`CONTENT_LOCATION` The HTTP `Content-Location` header field name.
`static String`	`CONTENT_RANGE` The HTTP `Content-Range` header field name.
`static String`	`CONTENT_TYPE` The HTTP `Content-Type` header field name.
`static String`	`COOKIE` The HTTP `Cookie` header field name.
`static String`	`DATE` The HTTP `Date` header field name.
`static HttpHeaders`	`EMPTY` An empty `HttpHeaders` instance (immutable).
`static String`	`ETAG` The HTTP `ETag` header field name.
`static String`	`EXPECT` The HTTP `Expect` header field name.
`static String`	`EXPIRES` The HTTP `Expires` header field name.
`static String`	`FROM` The HTTP `From` header field name.
`static String`	`HOST` The HTTP `Host` header field name.
`static String`	`IF_MATCH` The HTTP `If-Match` header field name.
`static String`	`IF_MODIFIED_SINCE` The HTTP `If-Modified-Since` header field name.
`static String`	`IF_NONE_MATCH` The HTTP `If-None-Match` header field name.
`static String`	`IF_RANGE` The HTTP `If-Range` header field name.
`static String`	`IF_UNMODIFIED_SINCE` The HTTP `If-Unmodified-Since` header field name.
`static String`	`LAST_MODIFIED` The HTTP `Last-Modified` header field name.
`static String`	`LINK` The HTTP `Link` header field name.
`static String`	`LOCATION` The HTTP `Location` header field name.
`static String`	`MAX_FORWARDS` The HTTP `Max-Forwards` header field name.
`static String`	`ORIGIN` The HTTP `Origin` header field name.
`static String`	`PRAGMA` The HTTP `Pragma` header field name.
`static String`	`PROXY_AUTHENTICATE` The HTTP `Proxy-Authenticate` header field name.
`static String`	`PROXY_AUTHORIZATION` The HTTP `Proxy-Authorization` header field name.
`static String`	`RANGE` The HTTP `Range` header field name.
`static String`	`REFERER` The HTTP `Referer` header field name.
`static String`	`RETRY_AFTER` The HTTP `Retry-After` header field name.
`static String`	`SERVER` The HTTP `Server` header field name.
`static String`	`SET_COOKIE` The HTTP `Set-Cookie` header field name.
`static String`	`SET_COOKIE2` The HTTP `Set-Cookie2` header field name.
`static String`	`TE` The HTTP `TE` header field name.
`static String`	`TRAILER` The HTTP `Trailer` header field name.
`static String`	`TRANSFER_ENCODING` The HTTP `Transfer-Encoding` header field name.
`static String`	`UPGRADE` The HTTP `Upgrade` header field name.
`static String`	`USER_AGENT` The HTTP `User-Agent` header field name.
`static String`	`VARY` The HTTP `Vary` header field name.
`static String`	`VIA` The HTTP `Via` header field name.
`static String`	`WARNING` The HTTP `Warning` header field name.
`static String`	`WWW_AUTHENTICATE` The HTTP `WWW-Authenticate` header field name.

Constructor Summary

Constructors
Constructor and Description
`HttpHeaders()` Construct a new, empty instance of the `HttpHeaders` object.
`HttpHeaders(MultiValueMap<String,String> headers)` Construct a new `HttpHeaders` instance backed by an existing map.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`add(String headerName, String headerValue)` Add the given, single header value under the given name.
`void`	`addAll(MultiValueMap<String,String> values)` Add all the values of the given `MultiValueMap` to the current values.
`void`	`addAll(String key, List<? extends String> values)` Add all the values of the given list to the current list of values for the given key.
`void`	`clear()`
`void`	`clearContentHeaders()` Remove the well-known `"Content-*"` HTTP headers.
`boolean`	`containsKey(Object key)`
`boolean`	`containsValue(Object value)`
`static String`	`encodeBasicAuth(String username, String password, Charset charset)` Encode the given username and password into Basic Authentication credentials.
`Set<Map.Entry<String,List<String>>>`	`entrySet()`
`boolean`	`equals(Object other)`
`static String`	`formatHeaders(MultiValueMap<String,String> headers)` Helps to format HTTP header values, as HTTP header values themselves can contain comma-separated values, can become confusing with regular `Map` formatting that also uses commas between entries.
`List<String>`	`get(Object key)`
`List<MediaType>`	`getAccept()` Return the list of acceptable media types, as specified by the `Accept` header.
`List<Charset>`	`getAcceptCharset()` Return the list of acceptable charsets, as specified by the `Accept-Charset` header.
`List<Locale.LanguageRange>`	`getAcceptLanguage()` Return the language ranges from the "Accept-Language" header.
`List<Locale>`	`getAcceptLanguageAsLocales()` A variant of `getAcceptLanguage()` that converts each `Locale.LanguageRange` to a `Locale`.
`List<MediaType>`	`getAcceptPatch()` Return the list of acceptable media types for `PATCH` methods, as specified by the `Accept-Patch` header.
`boolean`	`getAccessControlAllowCredentials()` Return the value of the `Access-Control-Allow-Credentials` response header.
`List<String>`	`getAccessControlAllowHeaders()` Return the value of the `Access-Control-Allow-Headers` response header.
`List<HttpMethod>`	`getAccessControlAllowMethods()` Return the value of the `Access-Control-Allow-Methods` response header.
`String`	`getAccessControlAllowOrigin()` Return the value of the `Access-Control-Allow-Origin` response header.
`List<String>`	`getAccessControlExposeHeaders()` Return the value of the `Access-Control-Expose-Headers` response header.
`long`	`getAccessControlMaxAge()` Return the value of the `Access-Control-Max-Age` response header.
`List<String>`	`getAccessControlRequestHeaders()` Return the value of the `Access-Control-Request-Headers` request header.
`HttpMethod`	`getAccessControlRequestMethod()` Return the value of the `Access-Control-Request-Method` request header.
`Set<HttpMethod>`	`getAllow()` Return the set of allowed `HTTP methods`, as specified by the `Allow` header.
`String`	`getCacheControl()` Return the value of the `Cache-Control` header.
`List<String>`	`getConnection()` Return the value of the `Connection` header.
`ContentDisposition`	`getContentDisposition()` Return a parsed representation of the Content-Disposition header.
`Locale`	`getContentLanguage()` Get the first `Locale` of the content languages, as specified by the `Content-Language` header.
`long`	`getContentLength()` Return the length of the body in bytes, as specified by the `Content-Length` header.
`MediaType`	`getContentType()` Return the media type of the body, as specified by the `Content-Type` header.
`long`	`getDate()` Return the date and time at which the message was created, as specified by the `Date` header.
`String`	`getETag()` Return the entity tag of the body, as specified by the `ETag` header.
`protected List<String>`	`getETagValuesAsList(String name)` Retrieve a combined result from the field values of the ETag header.
`long`	`getExpires()` Return the date and time at which the message is no longer valid, as specified by the `Expires` header.
`protected String`	`getFieldValues(String headerName)` Retrieve a combined result from the field values of multivalued headers.
`String`	`getFirst(String headerName)` Return the first header value for the given header name, if any.
`long`	`getFirstDate(String headerName)` Parse the first header value for the given header name as a date, return -1 if there is no value, or raise `IllegalArgumentException` if the value cannot be parsed as a date.
`ZonedDateTime`	`getFirstZonedDateTime(String headerName)` Parse the first header value for the given header name as a date, return `null` if there is no value, or raise `IllegalArgumentException` if the value cannot be parsed as a date.
`InetSocketAddress`	`getHost()` Return the value of the `Host` header, if available.
`List<String>`	`getIfMatch()` Return the value of the `If-Match` header.
`long`	`getIfModifiedSince()` Return the value of the `If-Modified-Since` header.
`List<String>`	`getIfNoneMatch()` Return the value of the `If-None-Match` header.
`long`	`getIfUnmodifiedSince()` Return the value of the `If-Unmodified-Since` header.
`long`	`getLastModified()` Return the time the resource was last changed, as specified by the `Last-Modified` header.
`URI`	`getLocation()` Return the (new) location of a resource as specified by the `Location` header.
`List<String>`	`getOrEmpty(Object headerName)` Get the list of header values for the given header name, if any.
`String`	`getOrigin()` Return the value of the `Origin` header.
`String`	`getPragma()` Return the value of the `Pragma` header.
`List<HttpRange>`	`getRange()` Return the value of the `Range` header.
`String`	`getUpgrade()` Return the value of the `Upgrade` header.
`List<String>`	`getValuesAsList(String headerName)` Return all values of a given header name, even if this header is set multiple times.
`List<String>`	`getVary()` Return the request header names subject to content negotiation.
`int`	`hashCode()`
`boolean`	`isEmpty()`
`Set<String>`	`keySet()`
`List<String>`	`put(String key, List<String> value)`
`void`	`putAll(Map<? extends String,? extends List<String>> map)`
`static HttpHeaders`	`readOnlyHttpHeaders(HttpHeaders headers)` Apply a read-only `HttpHeaders` wrapper around the given headers, if necessary.
`static HttpHeaders`	`readOnlyHttpHeaders(MultiValueMap<String,String> headers)` Apply a read-only `HttpHeaders` wrapper around the given headers, if necessary.
`List<String>`	`remove(Object key)`
`void`	`set(String headerName, String headerValue)` Set the given, single header value under the given name.
`void`	`setAccept(List<MediaType> acceptableMediaTypes)` Set the list of acceptable media types, as specified by the `Accept` header.
`void`	`setAcceptCharset(List<Charset> acceptableCharsets)` Set the list of acceptable charsets, as specified by the `Accept-Charset` header.
`void`	`setAcceptLanguage(List<Locale.LanguageRange> languages)` Set the acceptable language ranges, as specified by the Accept-Language header.
`void`	`setAcceptLanguageAsLocales(List<Locale> locales)` Variant of `setAcceptLanguage(List)` using `Locale`'s.
`void`	`setAcceptPatch(List<MediaType> mediaTypes)` Set the list of acceptable media types for `PATCH` methods, as specified by the `Accept-Patch` header.
`void`	`setAccessControlAllowCredentials(boolean allowCredentials)` Set the (new) value of the `Access-Control-Allow-Credentials` response header.
`void`	`setAccessControlAllowHeaders(List<String> allowedHeaders)` Set the (new) value of the `Access-Control-Allow-Headers` response header.
`void`	`setAccessControlAllowMethods(List<HttpMethod> allowedMethods)` Set the (new) value of the `Access-Control-Allow-Methods` response header.
`void`	`setAccessControlAllowOrigin(String allowedOrigin)` Set the (new) value of the `Access-Control-Allow-Origin` response header.
`void`	`setAccessControlExposeHeaders(List<String> exposedHeaders)` Set the (new) value of the `Access-Control-Expose-Headers` response header.
`void`	`setAccessControlMaxAge(Duration maxAge)` Set the (new) value of the `Access-Control-Max-Age` response header.
`void`	`setAccessControlMaxAge(long maxAge)` Set the (new) value of the `Access-Control-Max-Age` response header.
`void`	`setAccessControlRequestHeaders(List<String> requestHeaders)` Set the (new) value of the `Access-Control-Request-Headers` request header.
`void`	`setAccessControlRequestMethod(HttpMethod requestMethod)` Set the (new) value of the `Access-Control-Request-Method` request header.
`void`	`setAll(Map<String,String> values)` Set the given values under.
`void`	`setAllow(Set<HttpMethod> allowedMethods)` Set the set of allowed `HTTP methods`, as specified by the `Allow` header.
`void`	`setBasicAuth(String encodedCredentials)` Set the value of the Authorization header to Basic Authentication based on the given encoded credentials.
`void`	`setBasicAuth(String username, String password)` Set the value of the Authorization header to Basic Authentication based on the given username and password.
`void`	`setBasicAuth(String username, String password, Charset charset)` Set the value of the Authorization header to Basic Authentication based on the given username and password.
`void`	`setBearerAuth(String token)` Set the value of the Authorization header to the given Bearer token.
`void`	`setCacheControl(CacheControl cacheControl)` Set a configured `CacheControl` instance as the new value of the `Cache-Control` header.
`void`	`setCacheControl(String cacheControl)` Set the (new) value of the `Cache-Control` header.
`void`	`setConnection(List<String> connection)` Set the (new) value of the `Connection` header.
`void`	`setConnection(String connection)` Set the (new) value of the `Connection` header.
`void`	`setContentDisposition(ContentDisposition contentDisposition)` Set the Content-Disposition header.
`void`	`setContentDispositionFormData(String name, String filename)` Set the `Content-Disposition` header when creating a `"multipart/form-data"` request.
`void`	`setContentLanguage(Locale locale)` Set the `Locale` of the content language, as specified by the Content-Language header.
`void`	`setContentLength(long contentLength)` Set the length of the body in bytes, as specified by the `Content-Length` header.
`void`	`setContentType(MediaType mediaType)` Set the media type of the body, as specified by the `Content-Type` header.
`void`	`setDate(Instant date)` Set the date and time at which the message was created, as specified by the `Date` header.
`void`	`setDate(long date)` Set the date and time at which the message was created, as specified by the `Date` header.
`void`	`setDate(String headerName, long date)` Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter.
`void`	`setDate(ZonedDateTime date)` Set the date and time at which the message was created, as specified by the `Date` header.
`void`	`setETag(String etag)` Set the (new) entity tag of the body, as specified by the `ETag` header.
`void`	`setExpires(Instant expires)` Set the date and time at which the message is no longer valid, as specified by the `Expires` header.
`void`	`setExpires(long expires)` Set the date and time at which the message is no longer valid, as specified by the `Expires` header.
`void`	`setExpires(ZonedDateTime expires)` Set the duration after which the message is no longer valid, as specified by the `Expires` header.
`void`	`setHost(InetSocketAddress host)` Set the (new) value of the `Host` header.
`void`	`setIfMatch(List<String> ifMatchList)` Set the (new) value of the `If-Match` header.
`void`	`setIfMatch(String ifMatch)` Set the (new) value of the `If-Match` header.
`void`	`setIfModifiedSince(Instant ifModifiedSince)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setIfModifiedSince(long ifModifiedSince)` Set the (new) value of the `If-Modified-Since` header.
`void`	`setIfModifiedSince(ZonedDateTime ifModifiedSince)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setIfNoneMatch(List<String> ifNoneMatchList)` Set the (new) values of the `If-None-Match` header.
`void`	`setIfNoneMatch(String ifNoneMatch)` Set the (new) value of the `If-None-Match` header.
`void`	`setIfUnmodifiedSince(Instant ifUnmodifiedSince)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setIfUnmodifiedSince(long ifUnmodifiedSince)` Set the (new) value of the `If-Unmodified-Since` header.
`void`	`setIfUnmodifiedSince(ZonedDateTime ifUnmodifiedSince)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setInstant(String headerName, Instant date)` Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter.
`void`	`setLastModified(Instant lastModified)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setLastModified(long lastModified)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setLastModified(ZonedDateTime lastModified)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setLocation(URI location)` Set the (new) location of a resource, as specified by the `Location` header.
`void`	`setOrigin(String origin)` Set the (new) value of the `Origin` header.
`void`	`setPragma(String pragma)` Set the (new) value of the `Pragma` header.
`void`	`setRange(List<HttpRange> ranges)` Sets the (new) value of the `Range` header.
`void`	`setUpgrade(String upgrade)` Set the (new) value of the `Upgrade` header.
`void`	`setVary(List<String> requestHeaders)` Set the request header names (e.g.
`void`	`setZonedDateTime(String headerName, ZonedDateTime date)` Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter.
`int`	`size()`
`protected String`	`toCommaDelimitedString(List<String> headerValues)` Turn the given list of header values into a comma-delimited result.
`Map<String,String>`	`toSingleValueMap()` Return a `Map` with the first values contained in this `MultiValueMap`.
`String`	`toString()`
`Collection<List<String>>`	`values()`
`static HttpHeaders`	`writableHttpHeaders(HttpHeaders headers)` Remove any read-only wrapper that may have been previously applied around the given headers via `readOnlyHttpHeaders(HttpHeaders)`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.springframework.util.MultiValueMap
addIfAbsent

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

- Field Detail
  - ACCEPT
```
public static final String ACCEPT
```
    The HTTP Accept header field name.
    
    See Also:
    
    Section 5.3.2 of RFC 7231, Constant Field Values
  - ACCEPT_CHARSET
```
public static final String ACCEPT_CHARSET
```
    The HTTP Accept-Charset header field name.
    
    See Also:
    
    Section 5.3.3 of RFC 7231, Constant Field Values
  - ACCEPT_ENCODING
```
public static final String ACCEPT_ENCODING
```
    The HTTP Accept-Encoding header field name.
    
    See Also:
    
    Section 5.3.4 of RFC 7231, Constant Field Values
  - ACCEPT_LANGUAGE
```
public static final String ACCEPT_LANGUAGE
```
    The HTTP Accept-Language header field name.
    
    See Also:
    
    Section 5.3.5 of RFC 7231, Constant Field Values
  - ACCEPT_PATCH
```
public static final String ACCEPT_PATCH
```
    The HTTP Accept-Patch header field name.
    
    Since:
    
    5.3.6
    
    See Also:
    
    Section 3.1 of RFC 5789, Constant Field Values
  - ACCEPT_RANGES
```
public static final String ACCEPT_RANGES
```
    The HTTP Accept-Ranges header field name.
    
    See Also:
    
    Section 5.3.5 of RFC 7233, Constant Field Values
  - ACCESS_CONTROL_ALLOW_CREDENTIALS
```
public static final String ACCESS_CONTROL_ALLOW_CREDENTIALS
```
    The CORS Access-Control-Allow-Credentials response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_ALLOW_HEADERS
```
public static final String ACCESS_CONTROL_ALLOW_HEADERS
```
    The CORS Access-Control-Allow-Headers response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_ALLOW_METHODS
```
public static final String ACCESS_CONTROL_ALLOW_METHODS
```
    The CORS Access-Control-Allow-Methods response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_ALLOW_ORIGIN
```
public static final String ACCESS_CONTROL_ALLOW_ORIGIN
```
    The CORS Access-Control-Allow-Origin response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_EXPOSE_HEADERS
```
public static final String ACCESS_CONTROL_EXPOSE_HEADERS
```
    The CORS Access-Control-Expose-Headers response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_MAX_AGE
```
public static final String ACCESS_CONTROL_MAX_AGE
```
    The CORS Access-Control-Max-Age response header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_REQUEST_HEADERS
```
public static final String ACCESS_CONTROL_REQUEST_HEADERS
```
    The CORS Access-Control-Request-Headers request header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - ACCESS_CONTROL_REQUEST_METHOD
```
public static final String ACCESS_CONTROL_REQUEST_METHOD
```
    The CORS Access-Control-Request-Method request header field name.
    
    See Also:
    
    CORS W3C recommendation, Constant Field Values
  - AGE
```
public static final String AGE
```
    The HTTP Age header field name.
    
    See Also:
    
    Section 5.1 of RFC 7234, Constant Field Values
  - ALLOW
```
public static final String ALLOW
```
    The HTTP Allow header field name.
    
    See Also:
    
    Section 7.4.1 of RFC 7231, Constant Field Values
  - AUTHORIZATION
```
public static final String AUTHORIZATION
```
    The HTTP Authorization header field name.
    
    See Also:
    
    Section 4.2 of RFC 7235, Constant Field Values
  - CACHE_CONTROL
```
public static final String CACHE_CONTROL
```
    The HTTP Cache-Control header field name.
    
    See Also:
    
    Section 5.2 of RFC 7234, Constant Field Values
  - CONNECTION
```
public static final String CONNECTION
```
    The HTTP Connection header field name.
    
    See Also:
    
    Section 6.1 of RFC 7230, Constant Field Values
  - CONTENT_ENCODING
```
public static final String CONTENT_ENCODING
```
    The HTTP Content-Encoding header field name.
    
    See Also:
    
    Section 3.1.2.2 of RFC 7231, Constant Field Values
  - CONTENT_DISPOSITION
```
public static final String CONTENT_DISPOSITION
```
    The HTTP Content-Disposition header field name.
    
    See Also:
    
    RFC 6266, Constant Field Values
  - CONTENT_LANGUAGE
```
public static final String CONTENT_LANGUAGE
```
    The HTTP Content-Language header field name.
    
    See Also:
    
    Section 3.1.3.2 of RFC 7231, Constant Field Values
  - CONTENT_LENGTH
```
public static final String CONTENT_LENGTH
```
    The HTTP Content-Length header field name.
    
    See Also:
    
    Section 3.3.2 of RFC 7230, Constant Field Values
  - CONTENT_LOCATION
```
public static final String CONTENT_LOCATION
```
    The HTTP Content-Location header field name.
    
    See Also:
    
    Section 3.1.4.2 of RFC 7231, Constant Field Values
  - CONTENT_RANGE
```
public static final String CONTENT_RANGE
```
    The HTTP Content-Range header field name.
    
    See Also:
    
    Section 4.2 of RFC 7233, Constant Field Values
  - CONTENT_TYPE
```
public static final String CONTENT_TYPE
```
    The HTTP Content-Type header field name.
    
    See Also:
    
    Section 3.1.1.5 of RFC 7231, Constant Field Values
  - COOKIE
```
public static final String COOKIE
```
    The HTTP Cookie header field name.
    
    See Also:
    
    Section 4.3.4 of RFC 2109, Constant Field Values
  - DATE
```
public static final String DATE
```
    The HTTP Date header field name.
    
    See Also:
    
    Section 7.1.1.2 of RFC 7231, Constant Field Values
  - ETAG
```
public static final String ETAG
```
    The HTTP ETag header field name.
    
    See Also:
    
    Section 2.3 of RFC 7232, Constant Field Values
  - EXPECT
```
public static final String EXPECT
```
    The HTTP Expect header field name.
    
    See Also:
    
    Section 5.1.1 of RFC 7231, Constant Field Values
  - EXPIRES
```
public static final String EXPIRES
```
    The HTTP Expires header field name.
    
    See Also:
    
    Section 5.3 of RFC 7234, Constant Field Values
  - FROM
```
public static final String FROM
```
    The HTTP From header field name.
    
    See Also:
    
    Section 5.5.1 of RFC 7231, Constant Field Values
  - HOST
```
public static final String HOST
```
    The HTTP Host header field name.
    
    See Also:
    
    Section 5.4 of RFC 7230, Constant Field Values
  - IF_MATCH
```
public static final String IF_MATCH
```
    The HTTP If-Match header field name.
    
    See Also:
    
    Section 3.1 of RFC 7232, Constant Field Values
  - IF_MODIFIED_SINCE
```
public static final String IF_MODIFIED_SINCE
```
    The HTTP If-Modified-Since header field name.
    
    See Also:
    
    Section 3.3 of RFC 7232, Constant Field Values
  - IF_NONE_MATCH
```
public static final String IF_NONE_MATCH
```
    The HTTP If-None-Match header field name.
    
    See Also:
    
    Section 3.2 of RFC 7232, Constant Field Values
  - IF_RANGE
```
public static final String IF_RANGE
```
    The HTTP If-Range header field name.
    
    See Also:
    
    Section 3.2 of RFC 7233, Constant Field Values
  - IF_UNMODIFIED_SINCE
```
public static final String IF_UNMODIFIED_SINCE
```
    The HTTP If-Unmodified-Since header field name.
    
    See Also:
    
    Section 3.4 of RFC 7232, Constant Field Values
  - LAST_MODIFIED
```
public static final String LAST_MODIFIED
```
    The HTTP Last-Modified header field name.
    
    See Also:
    
    Section 2.2 of RFC 7232, Constant Field Values
  - LINK
```
public static final String LINK
```
    The HTTP Link header field name.
    
    See Also:
    
    RFC 5988, Constant Field Values
  - LOCATION
```
public static final String LOCATION
```
    The HTTP Location header field name.
    
    See Also:
    
    Section 7.1.2 of RFC 7231, Constant Field Values
  - MAX_FORWARDS
```
public static final String MAX_FORWARDS
```
    The HTTP Max-Forwards header field name.
    
    See Also:
    
    Section 5.1.2 of RFC 7231, Constant Field Values
  - ORIGIN
```
public static final String ORIGIN
```
    The HTTP Origin header field name.
    
    See Also:
    
    RFC 6454, Constant Field Values
  - PRAGMA
```
public static final String PRAGMA
```
    The HTTP Pragma header field name.
    
    See Also:
    
    Section 5.4 of RFC 7234, Constant Field Values
  - PROXY_AUTHENTICATE
```
public static final String PROXY_AUTHENTICATE
```
    The HTTP Proxy-Authenticate header field name.
    
    See Also:
    
    Section 4.3 of RFC 7235, Constant Field Values
  - PROXY_AUTHORIZATION
```
public static final String PROXY_AUTHORIZATION
```
    The HTTP Proxy-Authorization header field name.
    
    See Also:
    
    Section 4.4 of RFC 7235, Constant Field Values
  - RANGE
```
public static final String RANGE
```
    The HTTP Range header field name.
    
    See Also:
    
    Section 3.1 of RFC 7233, Constant Field Values
  - REFERER
```
public static final String REFERER
```
    The HTTP Referer header field name.
    
    See Also:
    
    Section 5.5.2 of RFC 7231, Constant Field Values
  - RETRY_AFTER
```
public static final String RETRY_AFTER
```
    The HTTP Retry-After header field name.
    
    See Also:
    
    Section 7.1.3 of RFC 7231, Constant Field Values
  - SERVER
```
public static final String SERVER
```
    The HTTP Server header field name.
    
    See Also:
    
    Section 7.4.2 of RFC 7231, Constant Field Values
  - SET_COOKIE
```
public static final String SET_COOKIE
```
    The HTTP Set-Cookie header field name.
    
    See Also:
    
    Section 4.2.2 of RFC 2109, Constant Field Values
  - SET_COOKIE2
```
public static final String SET_COOKIE2
```
    The HTTP Set-Cookie2 header field name.
    
    See Also:
    
    RFC 2965, Constant Field Values
  - TE
```
public static final String TE
```
    The HTTP TE header field name.
    
    See Also:
    
    Section 4.3 of RFC 7230, Constant Field Values
  - TRAILER
```
public static final String TRAILER
```
    The HTTP Trailer header field name.
    
    See Also:
    
    Section 4.4 of RFC 7230, Constant Field Values
  - TRANSFER_ENCODING
```
public static final String TRANSFER_ENCODING
```
    The HTTP Transfer-Encoding header field name.
    
    See Also:
    
    Section 3.3.1 of RFC 7230, Constant Field Values
  - UPGRADE
```
public static final String UPGRADE
```
    The HTTP Upgrade header field name.
    
    See Also:
    
    Section 6.7 of RFC 7230, Constant Field Values
  - USER_AGENT
```
public static final String USER_AGENT
```
    The HTTP User-Agent header field name.
    
    See Also:
    
    Section 5.5.3 of RFC 7231, Constant Field Values
  - VARY
```
public static final String VARY
```
    The HTTP Vary header field name.
    
    See Also:
    
    Section 7.1.4 of RFC 7231, Constant Field Values
  - VIA
```
public static final String VIA
```
    The HTTP Via header field name.
    
    See Also:
    
    Section 5.7.1 of RFC 7230, Constant Field Values
  - WARNING
```
public static final String WARNING
```
    The HTTP Warning header field name.
    
    See Also:
    
    Section 5.5 of RFC 7234, Constant Field Values
  - WWW_AUTHENTICATE
```
public static final String WWW_AUTHENTICATE
```
    The HTTP WWW-Authenticate header field name.
    
    See Also:
    
    Section 4.1 of RFC 7235, Constant Field Values
  - EMPTY
```
public static final HttpHeaders EMPTY
```
    An empty HttpHeaders instance (immutable).
    
    Since:
    
    5.0
- Constructor Detail
  - HttpHeaders
```
public HttpHeaders()
```
    Construct a new, empty instance of the HttpHeaders object.
    This is the common constructor, using a case-insensitive map structure.
  - HttpHeaders
```
public HttpHeaders(MultiValueMap<String,String> headers)
```
    Construct a new HttpHeaders instance backed by an existing map.
    This constructor is available as an optimization for adapting to existing headers map structures, primarily for internal use within the framework.
    
    Parameters:
    
    headers - the headers map (expected to operate with case-insensitive keys)
    
    Since:
    
    5.1
- Method Detail
  - getOrEmpty
```
public List<String> getOrEmpty(Object headerName)
```
    Get the list of header values for the given header name, if any.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the list of header values, or an empty list
    
    Since:
    
    5.2
  - setAccept
```
public void setAccept(List<MediaType> acceptableMediaTypes)
```
    Set the list of acceptable media types, as specified by the Accept header.
  - getAccept
```
public List<MediaType> getAccept()
```
    Return the list of acceptable media types, as specified by the Accept header.
    Returns an empty list when the acceptable media types are unspecified.
  - setAcceptLanguage
```
public void setAcceptLanguage(List<Locale.LanguageRange> languages)
```
    Set the acceptable language ranges, as specified by the Accept-Language header.
    
    Since:
    
    5.0
  - getAcceptLanguage
```
public List<Locale.LanguageRange> getAcceptLanguage()
```
    Return the language ranges from the "Accept-Language" header.
    If you only need sorted, preferred locales only use getAcceptLanguageAsLocales() or if you need to filter based on a list of supported locales you can pass the returned list to Locale.filter(List, Collection).
    
    Throws:
    
    IllegalArgumentException - if the value cannot be converted to a language range
    
    Since:
    
    5.0
  - setAcceptLanguageAsLocales
```
public void setAcceptLanguageAsLocales(List<Locale> locales)
```
    Variant of setAcceptLanguage(List) using Locale's.
    
    Since:
    
    5.0
  - getAcceptLanguageAsLocales
```
public List<Locale> getAcceptLanguageAsLocales()
```
    A variant of getAcceptLanguage() that converts each Locale.LanguageRange to a Locale.
    
    Returns:
    
    the locales or an empty list
    
    Throws:
    
    IllegalArgumentException - if the value cannot be converted to a locale
    
    Since:
    
    5.0
  - setAcceptPatch
```
public void setAcceptPatch(List<MediaType> mediaTypes)
```
    Set the list of acceptable media types for PATCH methods, as specified by the Accept-Patch header.
    
    Since:
    
    5.3.6
  - getAcceptPatch
```
public List<MediaType> getAcceptPatch()
```
    Return the list of acceptable media types for PATCH methods, as specified by the Accept-Patch header.
    Returns an empty list when the acceptable media types are unspecified.
    
    Since:
    
    5.3.6
  - setAccessControlAllowCredentials
```
public void setAccessControlAllowCredentials(boolean allowCredentials)
```
    Set the (new) value of the Access-Control-Allow-Credentials response header.
  - getAccessControlAllowCredentials
```
public boolean getAccessControlAllowCredentials()
```
    Return the value of the Access-Control-Allow-Credentials response header.
  - setAccessControlAllowHeaders
```
public void setAccessControlAllowHeaders(List<String> allowedHeaders)
```
    Set the (new) value of the Access-Control-Allow-Headers response header.
  - getAccessControlAllowHeaders
```
public List<String> getAccessControlAllowHeaders()
```
    Return the value of the Access-Control-Allow-Headers response header.
  - setAccessControlAllowMethods
```
public void setAccessControlAllowMethods(List<HttpMethod> allowedMethods)
```
    Set the (new) value of the Access-Control-Allow-Methods response header.
  - getAccessControlAllowMethods
```
public List<HttpMethod> getAccessControlAllowMethods()
```
    Return the value of the Access-Control-Allow-Methods response header.
  - setAccessControlAllowOrigin
```
public void setAccessControlAllowOrigin(@Nullable
                                        String allowedOrigin)
```
    Set the (new) value of the Access-Control-Allow-Origin response header.
  - getAccessControlAllowOrigin
```
@Nullable
public String getAccessControlAllowOrigin()
```
    Return the value of the Access-Control-Allow-Origin response header.
  - setAccessControlExposeHeaders
```
public void setAccessControlExposeHeaders(List<String> exposedHeaders)
```
    Set the (new) value of the Access-Control-Expose-Headers response header.
  - getAccessControlExposeHeaders
```
public List<String> getAccessControlExposeHeaders()
```
    Return the value of the Access-Control-Expose-Headers response header.
  - setAccessControlMaxAge
```
public void setAccessControlMaxAge(Duration maxAge)
```
    Set the (new) value of the Access-Control-Max-Age response header.
    
    Since:
    
    5.2
  - setAccessControlMaxAge
```
public void setAccessControlMaxAge(long maxAge)
```
    Set the (new) value of the Access-Control-Max-Age response header.
  - getAccessControlMaxAge
```
public long getAccessControlMaxAge()
```
    Return the value of the Access-Control-Max-Age response header.
    Returns -1 when the max age is unknown.
  - setAccessControlRequestHeaders
```
public void setAccessControlRequestHeaders(List<String> requestHeaders)
```
    Set the (new) value of the Access-Control-Request-Headers request header.
  - getAccessControlRequestHeaders
```
public List<String> getAccessControlRequestHeaders()
```
    Return the value of the Access-Control-Request-Headers request header.
  - setAccessControlRequestMethod
```
public void setAccessControlRequestMethod(@Nullable
                                          HttpMethod requestMethod)
```
    Set the (new) value of the Access-Control-Request-Method request header.
  - getAccessControlRequestMethod
```
@Nullable
public HttpMethod getAccessControlRequestMethod()
```
    Return the value of the Access-Control-Request-Method request header.
  - setAcceptCharset
```
public void setAcceptCharset(List<Charset> acceptableCharsets)
```
    Set the list of acceptable charsets, as specified by the Accept-Charset header.
  - getAcceptCharset
```
public List<Charset> getAcceptCharset()
```
    Return the list of acceptable charsets, as specified by the Accept-Charset header.
  - setAllow
```
public void setAllow(Set<HttpMethod> allowedMethods)
```
    Set the set of allowed HTTP methods, as specified by the Allow header.
  - getAllow
```
public Set<HttpMethod> getAllow()
```
    Return the set of allowed HTTP methods, as specified by the Allow header.
    Returns an empty set when the allowed methods are unspecified.
  - setBasicAuth
```
public void setBasicAuth(String username,
                         String password)
```
    Set the value of the Authorization header to Basic Authentication based on the given username and password.
    Note that this method only supports characters in the ISO-8859-1 character set.
    
    Parameters:
    
    username - the username
    
    password - the password
    
    Throws:
    
    IllegalArgumentException - if either user or password contain characters that cannot be encoded to ISO-8859-1
    
    Since:
    
    5.1
    
    See Also:
    
    setBasicAuth(String), setBasicAuth(String, String, Charset), encodeBasicAuth(String, String, Charset), RFC 7617
  - setBasicAuth
```
public void setBasicAuth(String username,
                         String password,
                         @Nullable
                         Charset charset)
```
    Set the value of the Authorization header to Basic Authentication based on the given username and password.
    
    Parameters:
    
    username - the username
    
    password - the password
    
    charset - the charset to use to convert the credentials into an octet sequence. Defaults to ISO-8859-1.
    
    Throws:
    
    IllegalArgumentException - if username or password contains characters that cannot be encoded to the given charset
    
    Since:
    
    5.1
    
    See Also:
    
    setBasicAuth(String), setBasicAuth(String, String), encodeBasicAuth(String, String, Charset), RFC 7617
  - setBasicAuth
```
public void setBasicAuth(String encodedCredentials)
```
    Set the value of the Authorization header to Basic Authentication based on the given encoded credentials.
    Favor this method over setBasicAuth(String, String) and setBasicAuth(String, String, Charset) if you wish to cache the encoded credentials.
    
    Parameters:
    
    encodedCredentials - the encoded credentials
    
    Throws:
    
    IllegalArgumentException - if supplied credentials string is null or blank
    
    Since:
    
    5.2
    
    See Also:
    
    setBasicAuth(String, String), setBasicAuth(String, String, Charset), encodeBasicAuth(String, String, Charset), RFC 7617
  - setBearerAuth
```
public void setBearerAuth(String token)
```
    Set the value of the Authorization header to the given Bearer token.
    
    Parameters:
    
    token - the Base64 encoded token
    
    Since:
    
    5.1
    
    See Also:
    
    RFC 6750
  - setCacheControl
```
public void setCacheControl(CacheControl cacheControl)
```
    Set a configured CacheControl instance as the new value of the Cache-Control header.
    
    Since:
    
    5.0.5
  - setCacheControl
```
public void setCacheControl(@Nullable
                            String cacheControl)
```
    Set the (new) value of the Cache-Control header.
  - getCacheControl
```
@Nullable
public String getCacheControl()
```
    Return the value of the Cache-Control header.
  - setConnection
```
public void setConnection(String connection)
```
    Set the (new) value of the Connection header.
  - setConnection
```
public void setConnection(List<String> connection)
```
    Set the (new) value of the Connection header.
  - getConnection
```
public List<String> getConnection()
```
    Return the value of the Connection header.
  - setContentDispositionFormData
```
public void setContentDispositionFormData(String name,
                                          @Nullable
                                          String filename)
```
    Set the Content-Disposition header when creating a "multipart/form-data" request.
    Applications typically would not set this header directly but rather prepare a MultiValueMap<String, Object>, containing an Object or a Resource for each part, and then pass that to the RestTemplate or WebClient.
    
    Parameters:
    
    name - the control name
    
    filename - the filename (may be null)
    
    See Also:
    
    getContentDisposition()
  - setContentDisposition
```
public void setContentDisposition(ContentDisposition contentDisposition)
```
    Set the Content-Disposition header.
    This could be used on a response to indicate if the content is expected to be displayed inline in the browser or as an attachment to be saved locally.
    It can also be used for a "multipart/form-data" request. For more details see notes on setContentDispositionFormData(java.lang.String, java.lang.String).
    
    Since:
    
    5.0
    
    See Also:
    
    getContentDisposition()
  - getContentDisposition
```
public ContentDisposition getContentDisposition()
```
    Return a parsed representation of the Content-Disposition header.
    
    Since:
    
    5.0
    
    See Also:
    
    setContentDisposition(ContentDisposition)
  - setContentLanguage
```
public void setContentLanguage(@Nullable
                               Locale locale)
```
    Set the Locale of the content language, as specified by the Content-Language header.
    Use put(CONTENT_LANGUAGE, list) if you need to set multiple content languages.
    
    Since:
    
    5.0
  - getContentLanguage
```
@Nullable
public Locale getContentLanguage()
```
    Get the first Locale of the content languages, as specified by the Content-Language header.
    Use getValuesAsList(String) if you need to get multiple content languages.
    
    Returns:
    
    the first Locale of the content languages, or null if unknown
    
    Since:
    
    5.0
  - setContentLength
```
public void setContentLength(long contentLength)
```
    Set the length of the body in bytes, as specified by the Content-Length header.
  - getContentLength
```
public long getContentLength()
```
    Return the length of the body in bytes, as specified by the Content-Length header.
    Returns -1 when the content-length is unknown.
  - setContentType
```
public void setContentType(@Nullable
                           MediaType mediaType)
```
    Set the media type of the body, as specified by the Content-Type header.
  - getContentType
```
@Nullable
public MediaType getContentType()
```
    Return the media type of the body, as specified by the Content-Type header.
    Returns null when the Content-Type header is not set.
    
    Throws:
    
    InvalidMediaTypeException - if the media type value cannot be parsed
  - setDate
```
public void setDate(ZonedDateTime date)
```
    Set the date and time at which the message was created, as specified by the Date header.
    
    Since:
    
    5.2
  - setDate
```
public void setDate(Instant date)
```
    Set the date and time at which the message was created, as specified by the Date header.
    
    Since:
    
    5.2
  - setDate
```
public void setDate(long date)
```
    Set the date and time at which the message was created, as specified by the Date header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
  - getDate
```
public long getDate()
```
    Return the date and time at which the message was created, as specified by the Date header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
    
    Throws:
    
    IllegalArgumentException - if the value cannot be converted to a date
  - setETag
```
public void setETag(@Nullable
                    String etag)
```
    Set the (new) entity tag of the body, as specified by the ETag header.
  - getETag
```
@Nullable
public String getETag()
```
    Return the entity tag of the body, as specified by the ETag header.
  - setExpires
```
public void setExpires(ZonedDateTime expires)
```
    Set the duration after which the message is no longer valid, as specified by the Expires header.
    
    Since:
    
    5.0.5
  - setExpires
```
public void setExpires(Instant expires)
```
    Set the date and time at which the message is no longer valid, as specified by the Expires header.
    
    Since:
    
    5.2
  - setExpires
```
public void setExpires(long expires)
```
    Set the date and time at which the message is no longer valid, as specified by the Expires header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
  - getExpires
```
public long getExpires()
```
    Return the date and time at which the message is no longer valid, as specified by the Expires header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
    
    See Also:
    
    getFirstZonedDateTime(String)
  - setHost
```
public void setHost(@Nullable
                    InetSocketAddress host)
```
    Set the (new) value of the Host header.
    If the given port is 0, the host header will only contain the host name.
    
    Since:
    
    5.0
  - getHost
```
@Nullable
public InetSocketAddress getHost()
```
    Return the value of the Host header, if available.
    If the header value does not contain a port, the port in the returned address will be 0.
    
    Since:
    
    5.0
  - setIfMatch
```
public void setIfMatch(String ifMatch)
```
    Set the (new) value of the If-Match header.
    
    Since:
    
    4.3
  - setIfMatch
```
public void setIfMatch(List<String> ifMatchList)
```
    Set the (new) value of the If-Match header.
    
    Since:
    
    4.3
  - getIfMatch
```
public List<String> getIfMatch()
```
    Return the value of the If-Match header.
    
    Throws:
    
    IllegalArgumentException - if parsing fails
    
    Since:
    
    4.3
  - setIfModifiedSince
```
public void setIfModifiedSince(ZonedDateTime ifModifiedSince)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setIfModifiedSince
```
public void setIfModifiedSince(Instant ifModifiedSince)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setIfModifiedSince
```
public void setIfModifiedSince(long ifModifiedSince)
```
    Set the (new) value of the If-Modified-Since header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
  - getIfModifiedSince
```
public long getIfModifiedSince()
```
    Return the value of the If-Modified-Since header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
    
    See Also:
    
    getFirstZonedDateTime(String)
  - setIfNoneMatch
```
public void setIfNoneMatch(String ifNoneMatch)
```
    Set the (new) value of the If-None-Match header.
  - setIfNoneMatch
```
public void setIfNoneMatch(List<String> ifNoneMatchList)
```
    Set the (new) values of the If-None-Match header.
  - getIfNoneMatch
```
public List<String> getIfNoneMatch()
```
    Return the value of the If-None-Match header.
    
    Throws:
    
    IllegalArgumentException - if parsing fails
  - setIfUnmodifiedSince
```
public void setIfUnmodifiedSince(ZonedDateTime ifUnmodifiedSince)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setIfUnmodifiedSince
```
public void setIfUnmodifiedSince(Instant ifUnmodifiedSince)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setIfUnmodifiedSince
```
public void setIfUnmodifiedSince(long ifUnmodifiedSince)
```
    Set the (new) value of the If-Unmodified-Since header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
    
    Since:
    
    4.3
  - getIfUnmodifiedSince
```
public long getIfUnmodifiedSince()
```
    Return the value of the If-Unmodified-Since header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
    
    Since:
    
    4.3
    
    See Also:
    
    getFirstZonedDateTime(String)
  - setLastModified
```
public void setLastModified(ZonedDateTime lastModified)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setLastModified
```
public void setLastModified(Instant lastModified)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    
    Since:
    
    5.1.4
  - setLastModified
```
public void setLastModified(long lastModified)
```
    Set the time the resource was last changed, as specified by the Last-Modified header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
  - getLastModified
```
public long getLastModified()
```
    Return the time the resource was last changed, as specified by the Last-Modified header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
    
    See Also:
    
    getFirstZonedDateTime(String)
  - setLocation
```
public void setLocation(@Nullable
                        URI location)
```
    Set the (new) location of a resource, as specified by the Location header.
  - getLocation
```
@Nullable
public URI getLocation()
```
    Return the (new) location of a resource as specified by the Location header.
    Returns null when the location is unknown.
  - setOrigin
```
public void setOrigin(@Nullable
                      String origin)
```
    Set the (new) value of the Origin header.
  - getOrigin
```
@Nullable
public String getOrigin()
```
    Return the value of the Origin header.
  - setPragma
```
public void setPragma(@Nullable
                      String pragma)
```
    Set the (new) value of the Pragma header.
  - getPragma
```
@Nullable
public String getPragma()
```
    Return the value of the Pragma header.
  - setRange
```
public void setRange(List<HttpRange> ranges)
```
    Sets the (new) value of the Range header.
  - getRange
```
public List<HttpRange> getRange()
```
    Return the value of the Range header.
    Returns an empty list when the range is unknown.
  - setUpgrade
```
public void setUpgrade(@Nullable
                       String upgrade)
```
    Set the (new) value of the Upgrade header.
  - getUpgrade
```
@Nullable
public String getUpgrade()
```
    Return the value of the Upgrade header.
  - setVary
```
public void setVary(List<String> requestHeaders)
```
    Set the request header names (e.g. "Accept-Language") for which the response is subject to content negotiation and variances based on the value of those request headers.
    
    Parameters:
    
    requestHeaders - the request header names
    
    Since:
    
    4.3
  - getVary
```
public List<String> getVary()
```
    Return the request header names subject to content negotiation.
    
    Since:
    
    4.3
  - setZonedDateTime
```
public void setZonedDateTime(String headerName,
                             ZonedDateTime date)
```
    Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter. The equivalent of set(String, String) but for date headers.
    
    Since:
    
    5.0
  - setInstant
```
public void setInstant(String headerName,
                       Instant date)
```
    Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter. The equivalent of set(String, String) but for date headers.
    
    Since:
    
    5.1.4
  - setDate
```
public void setDate(String headerName,
                    long date)
```
    Set the given date under the given header name after formatting it as a string using the RFC-1123 date-time formatter. The equivalent of set(String, String) but for date headers.
    
    Since:
    
    3.2.4
    
    See Also:
    
    setZonedDateTime(String, ZonedDateTime)
  - getFirstDate
```
public long getFirstDate(String headerName)
```
    Parse the first header value for the given header name as a date, return -1 if there is no value, or raise IllegalArgumentException if the value cannot be parsed as a date.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the parsed date header, or -1 if none
    
    Since:
    
    3.2.4
    
    See Also:
    
    getFirstZonedDateTime(String)
  - getFirstZonedDateTime
```
@Nullable
public ZonedDateTime getFirstZonedDateTime(String headerName)
```
    Parse the first header value for the given header name as a date, return null if there is no value, or raise IllegalArgumentException if the value cannot be parsed as a date.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the parsed date header, or null if none
    
    Since:
    
    5.0
  - getValuesAsList
```
public List<String> getValuesAsList(String headerName)
```
    Return all values of a given header name, even if this header is set multiple times.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    all associated values
    
    Since:
    
    4.3
  - clearContentHeaders
```
public void clearContentHeaders()
```
    Remove the well-known "Content-*" HTTP headers.
    Such headers should be cleared from the response if the intended body can't be written due to errors.
    
    Since:
    
    5.2.3
  - getETagValuesAsList
```
protected List<String> getETagValuesAsList(String name)
```
    Retrieve a combined result from the field values of the ETag header.
    
    Parameters:
    
    name - the header name
    
    Returns:
    
    the combined result
    
    Throws:
    
    IllegalArgumentException - if parsing fails
    
    Since:
    
    4.3
  - getFieldValues
```
@Nullable
protected String getFieldValues(String headerName)
```
    Retrieve a combined result from the field values of multivalued headers.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the combined result
    
    Since:
    
    4.3
  - toCommaDelimitedString
```
protected String toCommaDelimitedString(List<String> headerValues)
```
    Turn the given list of header values into a comma-delimited result.
    
    Parameters:
    
    headerValues - the list of header values
    
    Returns:
    
    a combined result with comma delimitation
  - getFirst
```
@Nullable
public String getFirst(String headerName)
```
    Return the first header value for the given header name, if any.
    
    Specified by:
    
    getFirst in interface MultiValueMap<String,String>
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the first header value, or null if none
  - add
```
public void add(String headerName,
                @Nullable
                String headerValue)
```
    Add the given, single header value under the given name.
    
    Specified by:
    
    add in interface MultiValueMap<String,String>
    
    Parameters:
    
    headerName - the header name
    
    headerValue - the header value
    
    Throws:
    
    UnsupportedOperationException - if adding headers is not supported
    
    See Also:
    
    put(String, List), set(String, String)
  - addAll
```
public void addAll(String key,
                   List<? extends String> values)
```
    Description copied from interface: MultiValueMap
    
    Add all the values of the given list to the current list of values for the given key.
    
    Specified by:
    
    addAll in interface MultiValueMap<String,String>
    
    Parameters:
    
    key - they key
    
    values - the values to be added
  - addAll
```
public void addAll(MultiValueMap<String,String> values)
```
    Description copied from interface: MultiValueMap
    
    Add all the values of the given MultiValueMap to the current values.
    
    Specified by:
    
    addAll in interface MultiValueMap<String,String>
    
    Parameters:
    
    values - the values to be added
  - set
```
public void set(String headerName,
                @Nullable
                String headerValue)
```
    Set the given, single header value under the given name.
    
    Specified by:
    
    set in interface MultiValueMap<String,String>
    
    Parameters:
    
    headerName - the header name
    
    headerValue - the header value
    
    Throws:
    
    UnsupportedOperationException - if adding headers is not supported
    
    See Also:
    
    put(String, List), add(String, String)
  - setAll
```
public void setAll(Map<String,String> values)
```
    Description copied from interface: MultiValueMap
    
    Set the given values under.
    
    Specified by:
    
    setAll in interface MultiValueMap<String,String>
    
    Parameters:
    
    values - the values.
  - toSingleValueMap
```
public Map<String,String> toSingleValueMap()
```
    Description copied from interface: MultiValueMap
    
    Return a Map with the first values contained in this MultiValueMap.
    
    Specified by:
    
    toSingleValueMap in interface MultiValueMap<String,String>
    
    Returns:
    
    a single value representation of this map
  - size
```
public int size()
```
    Specified by:
    
    size in interface Map<String,List<String>>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Map<String,List<String>>
  - containsKey
```
public boolean containsKey(Object key)
```
    Specified by:
    
    containsKey in interface Map<String,List<String>>
  - containsValue
```
public boolean containsValue(Object value)
```
    Specified by:
    
    containsValue in interface Map<String,List<String>>
  - get
```
@Nullable
public List<String> get(Object key)
```
    Specified by:
    
    get in interface Map<String,List<String>>
  - put
```
public List<String> put(String key,
                        List<String> value)
```
    Specified by:
    
    put in interface Map<String,List<String>>
  - remove
```
public List<String> remove(Object key)
```
    Specified by:
    
    remove in interface Map<String,List<String>>
  - putAll
```
public void putAll(Map<? extends String,? extends List<String>> map)
```
    Specified by:
    
    putAll in interface Map<String,List<String>>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Map<String,List<String>>
  - keySet
```
public Set<String> keySet()
```
    Specified by:
    
    keySet in interface Map<String,List<String>>
  - values
```
public Collection<List<String>> values()
```
    Specified by:
    
    values in interface Map<String,List<String>>
  - entrySet
```
public Set<Map.Entry<String,List<String>>> entrySet()
```
    Specified by:
    
    entrySet in interface Map<String,List<String>>
  - equals
```
public boolean equals(@Nullable
                      Object other)
```
    Specified by:
    
    equals in interface Map<String,List<String>>
    
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Map<String,List<String>>
    
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - readOnlyHttpHeaders
```
public static HttpHeaders readOnlyHttpHeaders(MultiValueMap<String,String> headers)
```
    Apply a read-only HttpHeaders wrapper around the given headers, if necessary.
    Also caches the parsed representations of the "Accept" and "Content-Type" headers.
    
    Parameters:
    
    headers - the headers to expose
    
    Returns:
    
    a read-only variant of the headers, or the original headers as-is (in case it happens to be a read-only HttpHeaders instance already)
    
    Since:
    
    5.3
  - readOnlyHttpHeaders
```
public static HttpHeaders readOnlyHttpHeaders(HttpHeaders headers)
```
    Apply a read-only HttpHeaders wrapper around the given headers, if necessary.
    Also caches the parsed representations of the "Accept" and "Content-Type" headers.
    
    Parameters:
    
    headers - the headers to expose
    
    Returns:
    
    a read-only variant of the headers, or the original headers as-is
  - writableHttpHeaders
```
public static HttpHeaders writableHttpHeaders(HttpHeaders headers)
```
    Remove any read-only wrapper that may have been previously applied around the given headers via readOnlyHttpHeaders(HttpHeaders).
    
    Parameters:
    
    headers - the headers to expose
    
    Returns:
    
    a writable variant of the headers, or the original headers as-is
    
    Since:
    
    5.1.1
  - formatHeaders
```
public static String formatHeaders(MultiValueMap<String,String> headers)
```
    Helps to format HTTP header values, as HTTP header values themselves can contain comma-separated values, can become confusing with regular Map formatting that also uses commas between entries.
    
    Parameters:
    
    headers - the headers to format
    
    Returns:
    
    the headers to a String
    
    Since:
    
    5.1.4
  - encodeBasicAuth
```
public static String encodeBasicAuth(String username,
                                     String password,
                                     @Nullable
                                     Charset charset)
```
    Encode the given username and password into Basic Authentication credentials.
    The encoded credentials returned by this method can be supplied to setBasicAuth(String) to set the Basic Authentication header.
    
    Parameters:
    
    username - the username
    
    password - the password
    
    charset - the charset to use to convert the credentials into an octet sequence. Defaults to ISO-8859-1.
    
    Throws:
    
    IllegalArgumentException - if username or password contains characters that cannot be encoded to the given charset
    
    Since:
    
    5.2
    
    See Also:
    
    setBasicAuth(String), setBasicAuth(String, String), setBasicAuth(String, String, Charset), RFC 7617

Class HttpHeaders

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.springframework.util.MultiValueMap

Methods inherited from interface java.util.Map

Field Detail

ACCEPT

ACCEPT_CHARSET

ACCEPT_ENCODING

ACCEPT_LANGUAGE

ACCEPT_PATCH

ACCEPT_RANGES

ACCESS_CONTROL_ALLOW_CREDENTIALS

ACCESS_CONTROL_ALLOW_HEADERS

ACCESS_CONTROL_ALLOW_METHODS

ACCESS_CONTROL_ALLOW_ORIGIN

ACCESS_CONTROL_EXPOSE_HEADERS

ACCESS_CONTROL_MAX_AGE

ACCESS_CONTROL_REQUEST_HEADERS

ACCESS_CONTROL_REQUEST_METHOD

AGE

ALLOW

AUTHORIZATION

CACHE_CONTROL

CONNECTION

CONTENT_ENCODING

CONTENT_DISPOSITION

CONTENT_LANGUAGE

CONTENT_LENGTH

CONTENT_LOCATION

CONTENT_RANGE

CONTENT_TYPE

COOKIE

DATE

ETAG

EXPECT

EXPIRES

FROM

HOST

IF_MATCH

IF_MODIFIED_SINCE

IF_NONE_MATCH

IF_RANGE

IF_UNMODIFIED_SINCE

LAST_MODIFIED

LINK

LOCATION

MAX_FORWARDS

ORIGIN

PRAGMA

PROXY_AUTHENTICATE

PROXY_AUTHORIZATION

RANGE

REFERER

RETRY_AFTER

SERVER

SET_COOKIE

SET_COOKIE2

TE

TRAILER

TRANSFER_ENCODING

UPGRADE

USER_AGENT

VARY

VIA

WARNING

WWW_AUTHENTICATE

EMPTY

Constructor Detail

HttpHeaders

HttpHeaders

Method Detail

getOrEmpty

setAccept

getAccept

setAcceptLanguage