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>
```
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 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 Headers.
Since:

3.0

Author:

Arjen Poutsma

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
`private static java.lang.String`	`ACCEPT`
`private static java.lang.String`	`ACCEPT_CHARSET`
`private static java.lang.String`	`ALLOW`
`private static java.lang.String`	`CACHE_CONTROL`
`private static java.lang.String`	`CONTENT_DISPOSITION`
`private static java.lang.String`	`CONTENT_LENGTH`
`private static java.lang.String`	`CONTENT_TYPE`
`private static java.lang.String`	`DATE`
`private static java.lang.String[]`	`DATE_FORMATS`
`private static java.lang.String`	`ETAG`
`private static java.lang.String`	`EXPIRES`
`private static java.util.TimeZone`	`GMT`
`private java.util.Map<java.lang.String,java.util.List<java.lang.String>>`	`headers`
`private static java.lang.String`	`IF_MODIFIED_SINCE`
`private static java.lang.String`	`IF_NONE_MATCH`
`private static java.lang.String`	`LAST_MODIFIED`
`private static java.lang.String`	`LOCATION`
`private static java.lang.String`	`PRAGMA`
`private static long`	`serialVersionUID`

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

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`	`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.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.
`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.
`long`	`getExpires()` Return the date and time at which the message is no longer valid, as specified by the `Expires` header.
`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.
`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`	`getIfNotModifiedSince()` Deprecated. use `getIfModifiedSince()`
`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`	`getPragma()` Return the value of the `Pragma` header.
`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)` Returns `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`	`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`	`setContentDispositionFormData(java.lang.String name, java.lang.String filename)` Set the (new) value of the `Content-Disposition` header for `form-data`.
`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`	`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`	`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`	`setPragma(java.lang.String pragma)` Set the (new) value of the `Pragma` header.
`int`	`size()`
`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

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    Constant Field Values
  - ACCEPT
```
private static final java.lang.String ACCEPT
```
    See Also:
    Constant Field Values
  - ACCEPT_CHARSET
```
private static final java.lang.String ACCEPT_CHARSET
```
    See Also:
    Constant Field Values
  - ALLOW
```
private static final java.lang.String ALLOW
```
    See Also:
    Constant Field Values
  - CACHE_CONTROL
```
private static final java.lang.String CACHE_CONTROL
```
    See Also:
    Constant Field Values
  - CONTENT_DISPOSITION
```
private static final java.lang.String CONTENT_DISPOSITION
```
    See Also:
    Constant Field Values
  - CONTENT_LENGTH
```
private static final java.lang.String CONTENT_LENGTH
```
    See Also:
    Constant Field Values
  - CONTENT_TYPE
```
private static final java.lang.String CONTENT_TYPE
```
    See Also:
    Constant Field Values
  - DATE
```
private static final java.lang.String DATE
```
    See Also:
    Constant Field Values
  - ETAG
```
private static final java.lang.String ETAG
```
    See Also:
    Constant Field Values
  - EXPIRES
```
private static final java.lang.String EXPIRES
```
    See Also:
    Constant Field Values
  - IF_MODIFIED_SINCE
```
private static final java.lang.String IF_MODIFIED_SINCE
```
    See Also:
    Constant Field Values
  - IF_NONE_MATCH
```
private static final java.lang.String IF_NONE_MATCH
```
    See Also:
    Constant Field Values
  - LAST_MODIFIED
```
private static final java.lang.String LAST_MODIFIED
```
    See Also:
    Constant Field Values
  - LOCATION
```
private static final java.lang.String LOCATION
```
    See Also:
    Constant Field Values
  - PRAGMA
```
private static final java.lang.String PRAGMA
```
    See Also:
    Constant Field Values
  - DATE_FORMATS
```
private static final java.lang.String[] DATE_FORMATS
```
  - 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
```
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.
  - HttpHeaders
```
public HttpHeaders()
```
    Constructs a new, empty instance of the HttpHeaders object.
- Method Detail
  - readOnlyHttpHeaders
```
public static HttpHeaders readOnlyHttpHeaders(HttpHeaders headers)
```
    Returns HttpHeaders object that can only be read, not written to.
  - 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.
  - 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.
  - 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)
  - 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.
  - 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.
  - getIfNotModifiedSince
```
@Deprecated
public long getIfNotModifiedSince()
```
    Deprecated. use getIfModifiedSince()
    
    Return the value of the IfModifiedSince header.
    The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
  - 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.
  - 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.
  - 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.
  - 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.
  - 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.
  - 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)
  - 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

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

Field Detail

serialVersionUID

ACCEPT

ACCEPT_CHARSET

ALLOW

CACHE_CONTROL

CONTENT_DISPOSITION

CONTENT_LENGTH

CONTENT_TYPE

DATE

ETAG

EXPIRES

IF_MODIFIED_SINCE

IF_NONE_MATCH

LAST_MODIFIED

LOCATION

PRAGMA

DATE_FORMATS

GMT

headers

Constructor Detail

HttpHeaders

HttpHeaders

Method Detail

readOnlyHttpHeaders

setAccept

getAccept

setAcceptCharset

getAcceptCharset

setAllow

getAllow

setCacheControl

getCacheControl

setContentDispositionFormData

setContentLength

getContentLength

setContentType

getContentType

setDate

getDate

setETag

getETag

setExpires

getExpires

setIfModifiedSince

getIfNotModifiedSince

getIfModifiedSince

setIfNoneMatch

setIfNoneMatch

getIfNoneMatch

setLastModified

getLastModified

setLocation

getLocation

setPragma

getPragma

getFirstDate

setDate

getFirst

add

set

setAll

toSingleValueMap

size

isEmpty

containsKey

containsValue

get

put

remove

putAll

clear

keySet