HttpHeaders

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

All Implemented Interfaces:

java.io.Serializable, java.util.Map<java.lang.String,java.util.List<java.lang.String>>, MultiValueMap<java.lang.String,java.lang.String>

Direct Known Subclasses:

ServletServerHttpResponse.ServletResponseHttpHeaders, WebSocketHttpHeaders
```
public class HttpHeaders
extends java.lang.Object
implements MultiValueMap<java.lang.String,java.lang.String>, java.io.Serializable
```
Represents HTTP request and response headers, mapping string header names to a list of string values.
In addition to the normal methods defined by Map, this class offers the following convenience methods:
- 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
Inspired by com.sun.net.httpserver.Headers.
Since:

3.0

Author:

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

See Also:

Serialized Form

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

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`ACCEPT` The HTTP `Accept` header field name.
`static java.lang.String`	`ACCEPT_CHARSET` The HTTP `Accept-Charset` header field name.
`static java.lang.String`	`ACCEPT_ENCODING` The HTTP `Accept-Encoding` header field name.
`static java.lang.String`	`ACCEPT_LANGUAGE` The HTTP `Accept-Language` header field name.
`static java.lang.String`	`ACCEPT_RANGES` The HTTP `Accept-Ranges` header field name.
`static java.lang.String`	`ACCESS_CONTROL_ALLOW_CREDENTIALS` The CORS `Access-Control-Allow-Credentials` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_ALLOW_HEADERS` The CORS `Access-Control-Allow-Headers` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_ALLOW_METHODS` The CORS `Access-Control-Allow-Methods` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_ALLOW_ORIGIN` The CORS `Access-Control-Allow-Origin` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_EXPOSE_HEADERS` The CORS `Access-Control-Expose-Headers` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_MAX_AGE` The CORS `Access-Control-Max-Age` response header field name.
`static java.lang.String`	`ACCESS_CONTROL_REQUEST_HEADERS` The CORS `Access-Control-Request-Headers` request header field name.
`static java.lang.String`	`ACCESS_CONTROL_REQUEST_METHOD` The CORS `Access-Control-Request-Method` request header field name.
`static java.lang.String`	`AGE` The HTTP `Age` header field name.
`static java.lang.String`	`ALLOW` The HTTP `Allow` header field name.
`static java.lang.String`	`AUTHORIZATION` The HTTP `Authorization` header field name.
`static java.lang.String`	`CACHE_CONTROL` The HTTP `Cache-Control` header field name.
`static java.lang.String`	`CONNECTION` The HTTP `Connection` header field name.
`static java.lang.String`	`CONTENT_DISPOSITION` The HTTP `Content-Disposition` header field name
`static java.lang.String`	`CONTENT_ENCODING` The HTTP `Content-Encoding` header field name.
`static java.lang.String`	`CONTENT_LANGUAGE` The HTTP `Content-Language` header field name.
`static java.lang.String`	`CONTENT_LENGTH` The HTTP `Content-Length` header field name.
`static java.lang.String`	`CONTENT_LOCATION` The HTTP `Content-Location` header field name.
`static java.lang.String`	`CONTENT_RANGE` The HTTP `Content-Range` header field name.
`static java.lang.String`	`CONTENT_TYPE` The HTTP `Content-Type` header field name.
`static java.lang.String`	`COOKIE` The HTTP `Cookie` header field name.
`static java.lang.String`	`DATE` The HTTP `Date` header field name.
`private static java.lang.String[]`	`DATE_FORMATS` Date formats as specified in the HTTP RFC
`private static java.text.DecimalFormatSymbols`	`DECIMAL_FORMAT_SYMBOLS`
`static java.lang.String`	`ETAG` The HTTP `ETag` header field name.
`private static java.util.regex.Pattern`	`ETAG_HEADER_VALUE_PATTERN` Pattern matching ETag multiple field values in headers such as "If-Match", "If-None-Match"
`static java.lang.String`	`EXPECT` The HTTP `Expect` header field name.
`static java.lang.String`	`EXPIRES` The HTTP `Expires` header field name.
`static java.lang.String`	`FROM` The HTTP `From` header field name.
`private static java.util.TimeZone`	`GMT`
`private java.util.Map<java.lang.String,java.util.List<java.lang.String>>`	`headers`
`static java.lang.String`	`HOST` The HTTP `Host` header field name.
`static java.lang.String`	`IF_MATCH` The HTTP `If-Match` header field name.
`static java.lang.String`	`IF_MODIFIED_SINCE` The HTTP `If-Modified-Since` header field name.
`static java.lang.String`	`IF_NONE_MATCH` The HTTP `If-None-Match` header field name.
`static java.lang.String`	`IF_RANGE` The HTTP `If-Range` header field name.
`static java.lang.String`	`IF_UNMODIFIED_SINCE` The HTTP `If-Unmodified-Since` header field name.
`static java.lang.String`	`LAST_MODIFIED` The HTTP `Last-Modified` header field name.
`static java.lang.String`	`LINK` The HTTP `Link` header field name.
`static java.lang.String`	`LOCATION` The HTTP `Location` header field name.
`static java.lang.String`	`MAX_FORWARDS` The HTTP `Max-Forwards` header field name.
`static java.lang.String`	`ORIGIN` The HTTP `Origin` header field name.
`static java.lang.String`	`PRAGMA` The HTTP `Pragma` header field name.
`static java.lang.String`	`PROXY_AUTHENTICATE` The HTTP `Proxy-Authenticate` header field name.
`static java.lang.String`	`PROXY_AUTHORIZATION` The HTTP `Proxy-Authorization` header field name.
`static java.lang.String`	`RANGE` The HTTP `Range` header field name.
`static java.lang.String`	`REFERER` The HTTP `Referer` header field name.
`static java.lang.String`	`RETRY_AFTER` The HTTP `Retry-After` header field name.
`private static long`	`serialVersionUID`
`static java.lang.String`	`SERVER` The HTTP `Server` header field name.
`static java.lang.String`	`SET_COOKIE` The HTTP `Set-Cookie` header field name.
`static java.lang.String`	`SET_COOKIE2` The HTTP `Set-Cookie2` header field name.
`static java.lang.String`	`TE` The HTTP `TE` header field name.
`static java.lang.String`	`TRAILER` The HTTP `Trailer` header field name.
`static java.lang.String`	`TRANSFER_ENCODING` The HTTP `Transfer-Encoding` header field name.
`static java.lang.String`	`UPGRADE` The HTTP `Upgrade` header field name.
`static java.lang.String`	`USER_AGENT` The HTTP `User-Agent` header field name.
`static java.lang.String`	`VARY` The HTTP `Vary` header field name.
`static java.lang.String`	`VIA` The HTTP `Via` header field name.
`static java.lang.String`	`WARNING` The HTTP `Warning` header field name.
`static java.lang.String`	`WWW_AUTHENTICATE` The HTTP `WWW-Authenticate` header field name.

Constructor Summary

Constructors
Modifier	Constructor and Description
	`HttpHeaders()` Constructs a new, empty instance of the `HttpHeaders` object.
`private`	`HttpHeaders(java.util.Map<java.lang.String,java.util.List<java.lang.String>> headers, boolean readOnly)` Private constructor that can create read-only `HttpHeader` instances.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`add(java.lang.String headerName, java.lang.String headerValue)` Add the given, single header value under the given name.
`void`	`addAll(java.lang.String key, java.util.List<java.lang.String> values)` Add all the values of the given list to the current list of values for the given key.
`void`	`clear()`
`boolean`	`containsKey(java.lang.Object key)`
`boolean`	`containsValue(java.lang.Object value)`
`java.util.Set<java.util.Map.Entry<java.lang.String,java.util.List<java.lang.String>>>`	`entrySet()`
`boolean`	`equals(java.lang.Object other)`
`java.util.List<java.lang.String>`	`get(java.lang.Object key)`
`java.util.List<MediaType>`	`getAccept()` Return the list of acceptable media types, as specified by the `Accept` header.
`java.util.List<java.nio.charset.Charset>`	`getAcceptCharset()` Return the list of acceptable charsets, as specified by the `Accept-Charset` header.
`java.util.List<java.util.Locale.LanguageRange>`	`getAcceptLanguage()` Return the acceptable language ranges from the Accept-Language header
`java.util.Locale`	`getAcceptLanguageAsLocale()` A variant of `getAcceptLanguage()` that converts each `Locale.LanguageRange` to a `Locale` and returns the first one on the list.
`boolean`	`getAccessControlAllowCredentials()` Return the value of the `Access-Control-Allow-Credentials` response header.
`java.util.List<java.lang.String>`	`getAccessControlAllowHeaders()` Return the value of the `Access-Control-Allow-Headers` response header.
`java.util.List<HttpMethod>`	`getAccessControlAllowMethods()` Return the value of the `Access-Control-Allow-Methods` response header.
`java.lang.String`	`getAccessControlAllowOrigin()` Return the value of the `Access-Control-Allow-Origin` response header.
`java.util.List<java.lang.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.
`java.util.List<java.lang.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.
`java.util.Set<HttpMethod>`	`getAllow()` Return the set of allowed `HTTP methods`, as specified by the `Allow` header.
`java.lang.String`	`getCacheControl()` Return the value of the `Cache-Control` header.
`java.util.List<java.lang.String>`	`getConnection()` Return the value of the `Connection` header.
`ContentDisposition`	`getContentDisposition()` Return the Content-Disposition header parsed as a `ContentDisposition` instance.
`java.util.Locale`	`getContentLanguage()` Return 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.
`java.lang.String`	`getETag()` Return the entity tag of the body, as specified by the `ETag` header.
`protected java.util.List<java.lang.String>`	`getETagValuesAsList(java.lang.String headerName)` 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 java.lang.String`	`getFieldValues(java.lang.String headerName)` Retrieve a combined result from the field values of multi-valued headers.
`java.lang.String`	`getFirst(java.lang.String headerName)` Return the first header value for the given header name, if any.
`long`	`getFirstDate(java.lang.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.
`private long`	`getFirstDate(java.lang.String headerName, boolean rejectInvalid)` Parse the first header value for the given header name as a date, return -1 if there is no value or also in case of an invalid value (if `rejectInvalid=false`), or raise `IllegalArgumentException` if the value cannot be parsed as a date.
`java.net.InetSocketAddress`	`getHost()` Return the value of the required `Host` header.
`java.util.List<java.lang.String>`	`getIfMatch()` Return the value of the `If-Match` header.
`long`	`getIfModifiedSince()` Return the value of the `If-Modified-Since` header.
`java.util.List<java.lang.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.
`java.net.URI`	`getLocation()` Return the (new) location of a resource as specified by the `Location` header.
`java.lang.String`	`getOrigin()` Return the value of the `Origin` header.
`java.lang.String`	`getPragma()` Return the value of the `Pragma` header.
`java.util.List<HttpRange>`	`getRange()` Return the value of the `Range` header.
`java.lang.String`	`getUpgrade()` Return the value of the `Upgrade` header.
`java.util.List<java.lang.String>`	`getValuesAsList(java.lang.String headerName)` Return all values of a given header name, even if this header is set multiple times.
`java.util.List<java.lang.String>`	`getVary()` Return the request header names subject to content negotiation.
`int`	`hashCode()`
`boolean`	`isEmpty()`
`java.util.Set<java.lang.String>`	`keySet()`
`java.util.List<java.lang.String>`	`put(java.lang.String key, java.util.List<java.lang.String> value)`
`void`	`putAll(java.util.Map<? extends java.lang.String,? extends java.util.List<java.lang.String>> map)`
`static HttpHeaders`	`readOnlyHttpHeaders(HttpHeaders headers)` Return a `HttpHeaders` object that can only be read, not written to.
`java.util.List<java.lang.String>`	`remove(java.lang.Object key)`
`void`	`set(java.lang.String headerName, java.lang.String headerValue)` Set the given, single header value under the given name.
`void`	`setAccept(java.util.List<MediaType> acceptableMediaTypes)` Set the list of acceptable media types, as specified by the `Accept` header.
`void`	`setAcceptCharset(java.util.List<java.nio.charset.Charset> acceptableCharsets)` Set the list of acceptable charsets, as specified by the `Accept-Charset` header.
`void`	`setAcceptLanguage(java.util.List<java.util.Locale.LanguageRange> languages)` Set the acceptable language ranges, as specified by the Accept-Language header.
`void`	`setAcceptLanguageAsLocale(java.util.Locale locale)` A variant of `setAcceptLanguage(List)` that sets the Accept-Language header value to the specified locale.
`void`	`setAccessControlAllowCredentials(boolean allowCredentials)` Set the (new) value of the `Access-Control-Allow-Credentials` response header.
`void`	`setAccessControlAllowHeaders(java.util.List<java.lang.String> allowedHeaders)` Set the (new) value of the `Access-Control-Allow-Headers` response header.
`void`	`setAccessControlAllowMethods(java.util.List<HttpMethod> allowedMethods)` Set the (new) value of the `Access-Control-Allow-Methods` response header.
`void`	`setAccessControlAllowOrigin(java.lang.String allowedOrigin)` Set the (new) value of the `Access-Control-Allow-Origin` response header.
`void`	`setAccessControlExposeHeaders(java.util.List<java.lang.String> exposedHeaders)` Set the (new) value of the `Access-Control-Expose-Headers` response header.
`void`	`setAccessControlMaxAge(long maxAge)` Set the (new) value of the `Access-Control-Max-Age` response header.
`void`	`setAccessControlRequestHeaders(java.util.List<java.lang.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(java.util.Map<java.lang.String,java.lang.String> values)` Set the given values under.
`void`	`setAllow(java.util.Set<HttpMethod> allowedMethods)` Set the set of allowed `HTTP methods`, as specified by the `Allow` header.
`void`	`setCacheControl(java.lang.String cacheControl)` Set the (new) value of the `Cache-Control` header.
`void`	`setConnection(java.util.List<java.lang.String> connection)` Set the (new) value of the `Connection` header.
`void`	`setConnection(java.lang.String connection)` Set the (new) value of the `Connection` header.
`void`	`setContentDisposition(ContentDisposition contentDisposition)` Set the (new) value of the Content-Disposition header.
`void`	`setContentDispositionFormData(java.lang.String name, java.lang.String filename)` Set the (new) value of the `Content-Disposition` header for `form-data`.
`void`	`setContentDispositionFormData(java.lang.String name, java.lang.String filename, java.nio.charset.Charset charset)` Set the (new) value of the `Content-Disposition` header for `form-data`, optionally encoding the filename using the RFC 5987.
`void`	`setContentLanguage(java.util.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(long date)` Set the date and time at which the message was created, as specified by the `Date` header.
`void`	`setDate(java.lang.String headerName, long date)` Set the given date under the given header name after formatting it as a string using the pattern `"EEE, dd MMM yyyy HH:mm:ss zzz"`.
`void`	`setETag(java.lang.String eTag)` Set the (new) entity tag of the body, as specified by the `ETag` 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`	`setHost(java.net.InetSocketAddress host)` Set the (new) value of the `Host` header.
`void`	`setIfMatch(java.util.List<java.lang.String> ifMatchList)` Set the (new) value of the `If-Match` header.
`void`	`setIfMatch(java.lang.String ifMatch)` Set the (new) value of the `If-Match` header.
`void`	`setIfModifiedSince(long ifModifiedSince)` Set the (new) value of the `If-Modified-Since` header.
`void`	`setIfNoneMatch(java.util.List<java.lang.String> ifNoneMatchList)` Set the (new) values of the `If-None-Match` header.
`void`	`setIfNoneMatch(java.lang.String ifNoneMatch)` Set the (new) value of the `If-None-Match` header.
`void`	`setIfUnmodifiedSince(long ifUnmodifiedSince)` Set the (new) value of the `If-Unmodified-Since` header.
`void`	`setLastModified(long lastModified)` Set the time the resource was last changed, as specified by the `Last-Modified` header.
`void`	`setLocation(java.net.URI location)` Set the (new) location of a resource, as specified by the `Location` header.
`void`	`setOrigin(java.lang.String origin)` Set the (new) value of the `Origin` header.
`void`	`setPragma(java.lang.String pragma)` Set the (new) value of the `Pragma` header.
`void`	`setRange(java.util.List<HttpRange> ranges)` Sets the (new) value of the `Range` header.
`void`	`setUpgrade(java.lang.String upgrade)` Set the (new) value of the `Upgrade` header.
`void`	`setVary(java.util.List<java.lang.String> requestHeaders)` Set the request header names (e.g.
`int`	`size()`
`protected java.lang.String`	`toCommaDelimitedString(java.util.List<java.lang.String> headerValues)` Turn the given list of header values into a comma-delimited result.
`java.util.Map<java.lang.String,java.lang.String>`	`toSingleValueMap()` Returns the first values contained in this `MultiValueMap`.
`java.lang.String`	`toString()`
`java.util.Collection<java.util.List<java.lang.String>>`	`values()`

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

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

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - ACCEPT
```
public static final java.lang.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 java.lang.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 java.lang.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 java.lang.String ACCEPT_LANGUAGE
```
    The HTTP Accept-Language header field name.
    
    See Also:
    
    Section 5.3.5 of RFC 7231, Constant Field Values
  - ACCEPT_RANGES
```
public static final java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.String AGE
```
    The HTTP Age header field name.
    
    See Also:
    
    Section 5.1 of RFC 7234, Constant Field Values
  - ALLOW
```
public static final java.lang.String ALLOW
```
    The HTTP Allow header field name.
    
    See Also:
    
    Section 7.4.1 of RFC 7231, Constant Field Values
  - AUTHORIZATION
```
public static final java.lang.String AUTHORIZATION
```
    The HTTP Authorization header field name.
    
    See Also:
    
    Section 4.2 of RFC 7235, Constant Field Values
  - CACHE_CONTROL
```
public static final java.lang.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 java.lang.String CONNECTION
```
    The HTTP Connection header field name.
    
    See Also:
    
    Section 6.1 of RFC 7230, Constant Field Values
  - CONTENT_ENCODING
```
public static final java.lang.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 java.lang.String CONTENT_DISPOSITION
```
    The HTTP Content-Disposition header field name
    
    See Also:
    
    RFC 6266, Constant Field Values
  - CONTENT_LANGUAGE
```
public static final java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.String COOKIE
```
    The HTTP Cookie header field name.
    
    See Also:
    
    Section 4.3.4 of RFC 2109, Constant Field Values
  - DATE
```
public static final java.lang.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 java.lang.String ETAG
```
    The HTTP ETag header field name.
    
    See Also:
    
    Section 2.3 of RFC 7232, Constant Field Values
  - EXPECT
```
public static final java.lang.String EXPECT
```
    The HTTP Expect header field name.
    
    See Also:
    
    Section 5.1.1 of RFC 7231, Constant Field Values
  - EXPIRES
```
public static final java.lang.String EXPIRES
```
    The HTTP Expires header field name.
    
    See Also:
    
    Section 5.3 of RFC 7234, Constant Field Values
  - FROM
```
public static final java.lang.String FROM
```
    The HTTP From header field name.
    
    See Also:
    
    Section 5.5.1 of RFC 7231, Constant Field Values
  - HOST
```
public static final java.lang.String HOST
```
    The HTTP Host header field name.
    
    See Also:
    
    Section 5.4 of RFC 7230, Constant Field Values
  - IF_MATCH
```
public static final java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.String LINK
```
    The HTTP Link header field name.
    
    See Also:
    
    RFC 5988, Constant Field Values
  - LOCATION
```
public static final java.lang.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 java.lang.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 java.lang.String ORIGIN
```
    The HTTP Origin header field name.
    
    See Also:
    
    RFC 6454, Constant Field Values
  - PRAGMA
```
public static final java.lang.String PRAGMA
```
    The HTTP Pragma header field name.
    
    See Also:
    
    Section 5.4 of RFC 7234, Constant Field Values
  - PROXY_AUTHENTICATE
```
public static final java.lang.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 java.lang.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 java.lang.String RANGE
```
    The HTTP Range header field name.
    
    See Also:
    
    Section 3.1 of RFC 7233, Constant Field Values
  - REFERER
```
public static final java.lang.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 java.lang.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 java.lang.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 java.lang.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 java.lang.String SET_COOKIE2
```
    The HTTP Set-Cookie2 header field name.
    
    See Also:
    
    RFC 2965, Constant Field Values
  - TE
```
public static final java.lang.String TE
```
    The HTTP TE header field name.
    
    See Also:
    
    Section 4.3 of RFC 7230, Constant Field Values
  - TRAILER
```
public static final java.lang.String TRAILER
```
    The HTTP Trailer header field name.
    
    See Also:
    
    Section 4.4 of RFC 7230, Constant Field Values
  - TRANSFER_ENCODING
```
public static final java.lang.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 java.lang.String UPGRADE
```
    The HTTP Upgrade header field name.
    
    See Also:
    
    Section 6.7 of RFC 7230, Constant Field Values
  - USER_AGENT
```
public static final java.lang.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 java.lang.String VARY
```
    The HTTP Vary header field name.
    
    See Also:
    
    Section 7.1.4 of RFC 7231, Constant Field Values
  - VIA
```
public static final java.lang.String VIA
```
    The HTTP Via header field name.
    
    See Also:
    
    Section 5.7.1 of RFC 7230, Constant Field Values
  - WARNING
```
public static final java.lang.String WARNING
```
    The HTTP Warning header field name.
    
    See Also:
    
    Section 5.5 of RFC 7234, Constant Field Values
  - WWW_AUTHENTICATE
```
public static final java.lang.String WWW_AUTHENTICATE
```
    The HTTP WWW-Authenticate header field name.
    
    See Also:
    
    Section 4.1 of RFC 7235, Constant Field Values
  - DATE_FORMATS
```
private static final java.lang.String[] DATE_FORMATS
```
    Date formats as specified in the HTTP RFC
    
    See Also:
    
    Section 7.1.1.1 of RFC 7231
  - ETAG_HEADER_VALUE_PATTERN
```
private static final java.util.regex.Pattern ETAG_HEADER_VALUE_PATTERN
```
    Pattern matching ETag multiple field values in headers such as "If-Match", "If-None-Match"
    
    See Also:
    
    Section 2.3 of RFC 7232
  - DECIMAL_FORMAT_SYMBOLS
```
private static final java.text.DecimalFormatSymbols DECIMAL_FORMAT_SYMBOLS
```
  - GMT
```
private static java.util.TimeZone GMT
```
  - headers
```
private final java.util.Map<java.lang.String,java.util.List<java.lang.String>> headers
```
- Constructor Detail
  - HttpHeaders
```
public HttpHeaders()
```
    Constructs a new, empty instance of the HttpHeaders object.
  - HttpHeaders
```
private HttpHeaders(java.util.Map<java.lang.String,java.util.List<java.lang.String>> headers,
                    boolean readOnly)
```
    Private constructor that can create read-only HttpHeader instances.
- Method Detail
  - setAccept
```
public void setAccept(java.util.List<MediaType> acceptableMediaTypes)
```
    Set the list of acceptable media types, as specified by the Accept header.
  - getAccept
```
public java.util.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(java.util.List<java.util.Locale.LanguageRange> languages)
```
    Set the acceptable language ranges, as specified by the Accept-Language header.
    
    Since:
    
    5.0
  - getAcceptLanguage
```
public java.util.List<java.util.Locale.LanguageRange> getAcceptLanguage()
```
    Return the acceptable language ranges from the Accept-Language header
    If you only need the most preferred locale use getAcceptLanguageAsLocale() or if you need to filter based on a list of supporeted locales you can pass the returned list to Locale.filter(List, Collection).
    
    Since:
    
    5.0
  - setAcceptLanguageAsLocale
```
public void setAcceptLanguageAsLocale(java.util.Locale locale)
```
    A variant of setAcceptLanguage(List) that sets the Accept-Language header value to the specified locale.
    
    Since:
    
    5.0
  - getAcceptLanguageAsLocale
```
public java.util.Locale getAcceptLanguageAsLocale()
```
    A variant of getAcceptLanguage() that converts each Locale.LanguageRange to a Locale and returns the first one on the list.
    
    Since:
    
    5.0
  - 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(java.util.List<java.lang.String> allowedHeaders)
```
    Set the (new) value of the Access-Control-Allow-Headers response header.
  - getAccessControlAllowHeaders
```
public java.util.List<java.lang.String> getAccessControlAllowHeaders()
```
    Return the value of the Access-Control-Allow-Headers response header.
  - setAccessControlAllowMethods
```
public void setAccessControlAllowMethods(java.util.List<HttpMethod> allowedMethods)
```
    Set the (new) value of the Access-Control-Allow-Methods response header.
  - getAccessControlAllowMethods
```
public java.util.List<HttpMethod> getAccessControlAllowMethods()
```
    Return the value of the Access-Control-Allow-Methods response header.
  - setAccessControlAllowOrigin
```
public void setAccessControlAllowOrigin(java.lang.String allowedOrigin)
```
    Set the (new) value of the Access-Control-Allow-Origin response header.
  - getAccessControlAllowOrigin
```
public java.lang.String getAccessControlAllowOrigin()
```
    Return the value of the Access-Control-Allow-Origin response header.
  - setAccessControlExposeHeaders
```
public void setAccessControlExposeHeaders(java.util.List<java.lang.String> exposedHeaders)
```
    Set the (new) value of the Access-Control-Expose-Headers response header.
  - getAccessControlExposeHeaders
```
public java.util.List<java.lang.String> getAccessControlExposeHeaders()
```
    Return the value of the Access-Control-Expose-Headers response header.
  - 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(java.util.List<java.lang.String> requestHeaders)
```
    Set the (new) value of the Access-Control-Request-Headers request header.
  - getAccessControlRequestHeaders
```
public java.util.List<java.lang.String> getAccessControlRequestHeaders()
```
    Return the value of the Access-Control-Request-Headers request header.
  - setAccessControlRequestMethod
```
public void setAccessControlRequestMethod(HttpMethod requestMethod)
```
    Set the (new) value of the Access-Control-Request-Method request header.
  - getAccessControlRequestMethod
```
public HttpMethod getAccessControlRequestMethod()
```
    Return the value of the Access-Control-Request-Method request header.
  - setAcceptCharset
```
public void setAcceptCharset(java.util.List<java.nio.charset.Charset> acceptableCharsets)
```
    Set the list of acceptable charsets, as specified by the Accept-Charset header.
  - getAcceptCharset
```
public java.util.List<java.nio.charset.Charset> getAcceptCharset()
```
    Return the list of acceptable charsets, as specified by the Accept-Charset header.
  - setAllow
```
public void setAllow(java.util.Set<HttpMethod> allowedMethods)
```
    Set the set of allowed HTTP methods, as specified by the Allow header.
  - getAllow
```
public java.util.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.
  - setCacheControl
```
public void setCacheControl(java.lang.String cacheControl)
```
    Set the (new) value of the Cache-Control header.
  - getCacheControl
```
public java.lang.String getCacheControl()
```
    Return the value of the Cache-Control header.
  - setConnection
```
public void setConnection(java.lang.String connection)
```
    Set the (new) value of the Connection header.
  - setConnection
```
public void setConnection(java.util.List<java.lang.String> connection)
```
    Set the (new) value of the Connection header.
  - getConnection
```
public java.util.List<java.lang.String> getConnection()
```
    Return the value of the Connection header.
  - setContentDispositionFormData
```
public void setContentDispositionFormData(java.lang.String name,
                                          java.lang.String filename)
```
    Set the (new) value of the Content-Disposition header for form-data.
    
    Parameters:
    
    name - the control name
    
    filename - the filename (may be null)
    
    See Also:
    
    setContentDisposition(ContentDisposition), getContentDisposition()
  - setContentDispositionFormData
```
public void setContentDispositionFormData(java.lang.String name,
                                          java.lang.String filename,
                                          java.nio.charset.Charset charset)
```
    Set the (new) value of the Content-Disposition header for form-data, optionally encoding the filename using the RFC 5987.
    Only the US-ASCII, UTF-8 and ISO-8859-1 charsets are supported.
    
    Parameters:
    
    name - the control name
    
    filename - the filename (may be null)
    
    charset - the charset used for the filename (may be null)
    
    Since:
    
    4.3.3
    
    See Also:
    
    setContentDisposition(ContentDisposition), getContentDisposition(), RFC 7230 Section 3.2.4
  - setContentDisposition
```
public void setContentDisposition(ContentDisposition contentDisposition)
```
    Set the (new) value of the Content-Disposition header. Supports the disposition type and filename, filename* (encoded according to RFC 5987, only the US-ASCII, UTF-8 and ISO-8859-1 charsets are supported), name, size parameters.
    
    Since:
    
    5.0
    
    See Also:
    
    getContentDisposition()
  - getContentDisposition
```
public ContentDisposition getContentDisposition()
```
    Return the Content-Disposition header parsed as a ContentDisposition instance. Supports the disposition type and filename, filename* (encoded according to RFC 5987, only the US-ASCII, UTF-8 and ISO-8859-1 charsets are supported), name, size parameters.
    
    Since:
    
    5.0
    
    See Also:
    
    setContentDisposition(ContentDisposition)
  - setContentLanguage
```
public void setContentLanguage(java.util.Locale locale)
```
    Set the Locale of the content language, as specified by the Content-Language header.
    Use set(CONTENT_LANGUAGE, ...) if you need to set multiple content languages.
    
    Since:
    
    5.0
  - getContentLanguage
```
public java.util.Locale getContentLanguage()
```
    Return the first Locale of the content languages, as specified by the Content-Language header.
    Returns null when the content language is unknown.
    Use getValuesAsList(CONTENT_LANGUAGE) if you need to get multiple content languages.
    
    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(MediaType mediaType)
```
    Set the media type of the body, as specified by the Content-Type header.
  - getContentType
```
public MediaType getContentType()
```
    Return the media type of the body, as specified by the Content-Type header.
    Returns null when the content-type is unknown.
  - 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:
    
    java.lang.IllegalArgumentException - if the value can't be converted to a date
  - setETag
```
public void setETag(java.lang.String eTag)
```
    Set the (new) entity tag of the body, as specified by the ETag header.
  - getETag
```
public java.lang.String getETag()
```
    Return the entity tag of the body, as specified by the ETag header.
  - 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.
  - setHost
```
public void setHost(java.net.InetSocketAddress host)
```
    Set the (new) value of the Host header.
    If the given port is 0, the host header will only contain the hostname.
    
    Since:
    
    5.0
  - getHost
```
public java.net.InetSocketAddress getHost()
```
    Return the value of the required Host header.
    If the header value does not contain a port, the returned port will be 0.
    
    Since:
    
    5.0
  - setIfMatch
```
public void setIfMatch(java.lang.String ifMatch)
```
    Set the (new) value of the If-Match header.
    
    Since:
    
    4.3
  - setIfMatch
```
public void setIfMatch(java.util.List<java.lang.String> ifMatchList)
```
    Set the (new) value of the If-Match header.
    
    Since:
    
    4.3
  - getIfMatch
```
public java.util.List<java.lang.String> getIfMatch()
```
    Return the value of the If-Match header.
    
    Since:
    
    4.3
  - 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.
  - setIfNoneMatch
```
public void setIfNoneMatch(java.lang.String ifNoneMatch)
```
    Set the (new) value of the If-None-Match header.
  - setIfNoneMatch
```
public void setIfNoneMatch(java.util.List<java.lang.String> ifNoneMatchList)
```
    Set the (new) values of the If-None-Match header.
  - getIfNoneMatch
```
public java.util.List<java.lang.String> getIfNoneMatch()
```
    Return the value of the If-None-Match header.
  - 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
  - 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.
  - setLocation
```
public void setLocation(java.net.URI location)
```
    Set the (new) location of a resource, as specified by the Location header.
  - getLocation
```
public java.net.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(java.lang.String origin)
```
    Set the (new) value of the Origin header.
  - getOrigin
```
public java.lang.String getOrigin()
```
    Return the value of the Origin header.
  - setPragma
```
public void setPragma(java.lang.String pragma)
```
    Set the (new) value of the Pragma header.
  - getPragma
```
public java.lang.String getPragma()
```
    Return the value of the Pragma header.
  - setRange
```
public void setRange(java.util.List<HttpRange> ranges)
```
    Sets the (new) value of the Range header.
  - getRange
```
public java.util.List<HttpRange> getRange()
```
    Return the value of the Range header.
    Returns an empty list when the range is unknown.
  - setUpgrade
```
public void setUpgrade(java.lang.String upgrade)
```
    Set the (new) value of the Upgrade header.
  - getUpgrade
```
public java.lang.String getUpgrade()
```
    Return the value of the Upgrade header.
  - setVary
```
public void setVary(java.util.List<java.lang.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 java.util.List<java.lang.String> getVary()
```
    Return the request header names subject to content negotiation.
    
    Since:
    
    4.3
  - setDate
```
public void setDate(java.lang.String headerName,
                    long date)
```
    Set the given date under the given header name after formatting it as a string using the pattern "EEE, dd MMM yyyy HH:mm:ss zzz". The equivalent of set(String, String) but for date headers.
    
    Since:
    
    3.2.4
  - getFirstDate
```
public long getFirstDate(java.lang.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
  - getFirstDate
```
private long getFirstDate(java.lang.String headerName,
                          boolean rejectInvalid)
```
    Parse the first header value for the given header name as a date, return -1 if there is no value or also in case of an invalid value (if rejectInvalid=false), or raise IllegalArgumentException if the value cannot be parsed as a date.
    
    Parameters:
    
    headerName - the header name
    
    rejectInvalid - whether to reject invalid values with an IllegalArgumentException (true) or rather return -1 in that case (false)
    
    Returns:
    
    the parsed date header, or -1 if none (or invalid)
  - getValuesAsList
```
public java.util.List<java.lang.String> getValuesAsList(java.lang.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
  - getETagValuesAsList
```
protected java.util.List<java.lang.String> getETagValuesAsList(java.lang.String headerName)
```
    Retrieve a combined result from the field values of the ETag header.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the combined result
    
    Since:
    
    4.3
  - getFieldValues
```
protected java.lang.String getFieldValues(java.lang.String headerName)
```
    Retrieve a combined result from the field values of multi-valued headers.
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the combined result
    
    Since:
    
    4.3
  - toCommaDelimitedString
```
protected java.lang.String toCommaDelimitedString(java.util.List<java.lang.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
```
public java.lang.String getFirst(java.lang.String headerName)
```
    Return the first header value for the given header name, if any.
    
    Specified by:
    
    getFirst in interface MultiValueMap<java.lang.String,java.lang.String>
    
    Parameters:
    
    headerName - the header name
    
    Returns:
    
    the first header value, or null if none
  - add
```
public void add(java.lang.String headerName,
                java.lang.String headerValue)
```
    Add the given, single header value under the given name.
    
    Specified by:
    
    add in interface MultiValueMap<java.lang.String,java.lang.String>
    
    Parameters:
    
    headerName - the header name
    
    headerValue - the header value
    
    Throws:
    
    java.lang.UnsupportedOperationException - if adding headers is not supported
    
    See Also:
    
    put(String, List), set(String, String)
  - addAll
```
public void addAll(java.lang.String key,
                   java.util.List<java.lang.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<java.lang.String,java.lang.String>
    
    Parameters:
    
    key - they key
    
    values - the values to be added
  - set
```
public void set(java.lang.String headerName,
                java.lang.String headerValue)
```
    Set the given, single header value under the given name.
    
    Specified by:
    
    set in interface MultiValueMap<java.lang.String,java.lang.String>
    
    Parameters:
    
    headerName - the header name
    
    headerValue - the header value
    
    Throws:
    
    java.lang.UnsupportedOperationException - if adding headers is not supported
    
    See Also:
    
    put(String, List), add(String, String)
  - setAll
```
public void setAll(java.util.Map<java.lang.String,java.lang.String> values)
```
    Description copied from interface: MultiValueMap
    
    Set the given values under.
    
    Specified by:
    
    setAll in interface MultiValueMap<java.lang.String,java.lang.String>
    
    Parameters:
    
    values - the values.
  - toSingleValueMap
```
public java.util.Map<java.lang.String,java.lang.String> toSingleValueMap()
```
    Description copied from interface: MultiValueMap
    
    Returns the first values contained in this MultiValueMap.
    
    Specified by:
    
    toSingleValueMap in interface MultiValueMap<java.lang.String,java.lang.String>
    
    Returns:
    
    a single value representation of this map
  - size
```
public int size()
```
    Specified by:
    
    size in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - containsKey
```
public boolean containsKey(java.lang.Object key)
```
    Specified by:
    
    containsKey in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - containsValue
```
public boolean containsValue(java.lang.Object value)
```
    Specified by:
    
    containsValue in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - get
```
public java.util.List<java.lang.String> get(java.lang.Object key)
```
    Specified by:
    
    get in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - put
```
public java.util.List<java.lang.String> put(java.lang.String key,
                                            java.util.List<java.lang.String> value)
```
    Specified by:
    
    put in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - remove
```
public java.util.List<java.lang.String> remove(java.lang.Object key)
```
    Specified by:
    
    remove in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - putAll
```
public void putAll(java.util.Map<? extends java.lang.String,? extends java.util.List<java.lang.String>> map)
```
    Specified by:
    
    putAll in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - keySet
```
public java.util.Set<java.lang.String> keySet()
```
    Specified by:
    
    keySet in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - values
```
public java.util.Collection<java.util.List<java.lang.String>> values()
```
    Specified by:
    
    values in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - entrySet
```
public java.util.Set<java.util.Map.Entry<java.lang.String,java.util.List<java.lang.String>>> entrySet()
```
    Specified by:
    
    entrySet in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
  - equals
```
public boolean equals(java.lang.Object other)
```
    Specified by:
    
    equals in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
    
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface java.util.Map<java.lang.String,java.util.List<java.lang.String>>
    
    Overrides:
    
    hashCode in class java.lang.Object
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - readOnlyHttpHeaders
```
public static HttpHeaders readOnlyHttpHeaders(HttpHeaders headers)
```
    Return a HttpHeaders object that can only be read, not written to.

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 java.util.Map

Field Detail

serialVersionUID

ACCEPT

ACCEPT_CHARSET

ACCEPT_ENCODING

ACCEPT_LANGUAGE

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

DATE_FORMATS

ETAG_HEADER_VALUE_PATTERN

DECIMAL_FORMAT_SYMBOLS

GMT

headers

Constructor Detail

HttpHeaders

HttpHeaders

Method Detail

setAccept