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

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`	`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()` Returns 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()` Returns the date and time at which the message was created, as specified by the `Date` header.
`java.lang.String`	`getETag()` Returns the entity tag of the body, as specified by the `ETag` header.
`long`	`getExpires()` Returns 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.
`private long`	`getFirstDate(java.lang.String headerName)`
`java.util.List<java.lang.String>`	`getIfNoneMatch()` Returns the value of the `If-None-Match` header.
`long`	`getIfNotModifiedSince()` Returns the value of the `IfModifiedSince` header.
`long`	`getLastModified()` Returns 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()` Returns 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>> m)`
`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)` Sets the (new) value of the `Cache-Control` header.
`void`	`setContentDispositionFormData(java.lang.String name, java.lang.String filename)` Sets 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)` Sets the date and time at which the message was created, as specified by the `Date` header.
`private void`	`setDate(java.lang.String headerName, long date)`
`void`	`setETag(java.lang.String eTag)` Sets the (new) entity tag of the body, as specified by the `ETag` header.
`void`	`setExpires(long expires)` Sets the date and time at which the message is no longer valid, as specified by the `Expires` header.
`void`	`setIfModifiedSince(long ifModifiedSince)` Sets the (new) value of the `If-Modified-Since` header.
`void`	`setIfNoneMatch(java.util.List<java.lang.String> ifNoneMatchList)` Sets the (new) values of the `If-None-Match` header.
`void`	`setIfNoneMatch(java.lang.String ifNoneMatch)` Sets the (new) value of the `If-None-Match` header.
`void`	`setLastModified(long lastModified)` Sets 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)` Sets 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

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
```
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.
    
    Parameters:
    acceptableMediaTypes - the acceptable media types
  - 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.
    
    Returns:
    the acceptable media types
  - 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.
    
    Parameters:
    acceptableCharsets - the acceptable charsets
  - getAcceptCharset
```
public java.util.List<java.nio.charset.Charset> getAcceptCharset()
```
    Return the list of acceptable charsets, as specified by the Accept-Charset header.
    
    Returns:
    the acceptable charsets
  - setAllow
```
public void setAllow(java.util.Set<HttpMethod> allowedMethods)
```
    Set the set of allowed HTTP methods, as specified by the Allow header.
    
    Parameters:
    allowedMethods - the allowed methods
  - 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.
    
    Returns:
    the allowed methods
  - setCacheControl
```
public void setCacheControl(java.lang.String cacheControl)
```
    Sets the (new) value of the Cache-Control header.
    
    Parameters:
    cacheControl - the value of the header
  - getCacheControl
```
public java.lang.String getCacheControl()
```
    Returns the value of the Cache-Control header.
    
    Returns:
    the value of the header
  - setContentDispositionFormData
```
public void setContentDispositionFormData(java.lang.String name,
                                 java.lang.String filename)
```
    Sets 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.
    
    Parameters:
    contentLength - the content length
  - 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.
    
    Returns:
    the content length
  - setContentType
```
public void setContentType(MediaType mediaType)
```
    Set the media type of the body, as specified by the Content-Type header.
    
    Parameters:
    mediaType - the media type
  - 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.
    
    Returns:
    the content type
  - setDate
```
public void setDate(long date)
```
    Sets 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.
    
    Parameters:
    date - the date
  - getDate
```
public long getDate()
```
    Returns 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.
    
    Returns:
    the creation date/time
    
    Throws:
    
    java.lang.IllegalArgumentException - if the value can't be converted to a date
  - setETag
```
public void setETag(java.lang.String eTag)
```
    Sets the (new) entity tag of the body, as specified by the ETag header.
    
    Parameters:
    eTag - the new entity tag
  - getETag
```
public java.lang.String getETag()
```
    Returns the entity tag of the body, as specified by the ETag header.
    
    Returns:
    the entity tag
  - setExpires
```
public void setExpires(long expires)
```
    Sets 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.
    
    Parameters:
    expires - the new expires header value
  - getExpires
```
public long getExpires()
```
    Returns 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.
    
    Returns:
    the expires value
  - setIfModifiedSince
```
public void setIfModifiedSince(long ifModifiedSince)
```
    Sets the (new) value of the If-Modified-Since header.
    The date should be specified as the number of milliseconds since January 1, 1970 GMT.
    
    Parameters:
    ifModifiedSince - the new value of the header
  - getIfNotModifiedSince
```
public long getIfNotModifiedSince()
```
    Returns 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.
    
    Returns:
    the header value
  - setIfNoneMatch
```
public void setIfNoneMatch(java.lang.String ifNoneMatch)
```
    Sets the (new) value of the If-None-Match header.
    
    Parameters:
    ifNoneMatch - the new value of the header
  - setIfNoneMatch
```
public void setIfNoneMatch(java.util.List<java.lang.String> ifNoneMatchList)
```
    Sets the (new) values of the If-None-Match header.
    
    Parameters:
    ifNoneMatchList - the new value of the header
  - getIfNoneMatch
```
public java.util.List<java.lang.String> getIfNoneMatch()
```
    Returns the value of the If-None-Match header.
    
    Returns:
    the header value
  - setLastModified
```
public void setLastModified(long lastModified)
```
    Sets 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.
    
    Parameters:
    lastModified - the last modified date
  - getLastModified
```
public long getLastModified()
```
    Returns 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.
    
    Returns:
    the last modified date
  - setLocation
```
public void setLocation(java.net.URI location)
```
    Set the (new) location of a resource, as specified by the Location header.
    
    Parameters:
    location - the location
  - 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.
    
    Returns:
    the location
  - setPragma
```
public void setPragma(java.lang.String pragma)
```
    Sets the (new) value of the Pragma header.
    
    Parameters:
    pragma - the value of the header
  - getPragma
```
public java.lang.String getPragma()
```
    Returns the value of the Pragma header.
    
    Returns:
    the value of the header
  - getFirstDate
```
private long getFirstDate(java.lang.String headerName)
```
  - setDate
```
private void setDate(java.lang.String headerName,
           long date)
```
  - 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
  - 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>> m)
```
    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

Methods inherited from interface java.util.Map

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

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