```
public interface HttpResponseHeader
```
A list of common response header constants of the HTTP protocol. See http://en.wikipedia.org/wiki/List_of_HTTP_header_fields.

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`AcceptRanges`	What partial content range types this server supports.
`static java.lang.String`	`AccessControlAllowOrigin`	Specifying which web sites can participate in cross-origin resource sharing.
`static java.lang.String`	`Age`	The age the object has been in a proxy cache in seconds.
`static java.lang.String`	`Allow`	Valid actions for a specified resource.
`static java.lang.String`	`CacheControl`	Tells all caching mechanisms from server to client whether they may cache this object.
`static java.lang.String`	`Connection`	Options that are desired for the connection.
`static java.lang.String`	`ContentDisposition`	An opportunity to raise a "File Download" dialogue box for a known MIME type with binary format or suggest a filename for dynamic content.
`static java.lang.String`	`ContentEncoding`	The type of encoding used on the data.
`static java.lang.String`	`ContentLanguage`	The language the content is in.
`static java.lang.String`	`ContentLength`	The length of the response body in octets (8-bit bytes).
`static java.lang.String`	`ContentLocation`	An alternate location for the returned data.
`static java.lang.String`	`ContentMD5`	A Base64-encoded binary MD5 sum of the content of the response.
`static java.lang.String`	`ContentRange`	Where in a full body message this partial message belongs.
`static java.lang.String`	`ContentType`	The MIME type of this content.
`static java.lang.String`	`Date`	The date and time that the message was sent (in "HTTP-date" format as defined by RFC 7231).
`static java.lang.String`	`ETag`	An identifier for a specific version of a resource, often a message digest.
`static java.lang.String`	`Expires`	Gives the date/time after which the response is considered stale.
`static java.lang.String`	`LastModified`	The last modified date for the requested object (in "HTTP-date" format as defined by RFC 7231).
`static java.lang.String`	`Link`	Used to express a typed relationship with another resource, where the relation type is defined by RFC 5988.
`static java.lang.String`	`Location`	Used in redirection, or when a new resource has been created.
`static java.lang.String`	`P3P`	This field is supposed to set P3P policy, in the form of P3P:CP="your_compact_policy".
`static java.lang.String`	`Pragma`	Implementation-specific fields that may have various effects anywhere along the request-response chain.
`static java.lang.String`	`ProxyAuthenticate`	Request authentication to access the proxy.
`static java.lang.String`	`Refresh`	Used in redirection, or when a new resource has been created.
`static java.lang.String`	`RetryAfter`	If an entity is temporarily unavailable, this instructs the client to try again later.
`static java.lang.String`	`Server`	A name for the server.
`static java.lang.String`	`SetCookie`	An HTTP cookie.
`static java.lang.String`	`Status`	CGI header field specifying the status of the HTTP response.
`static java.lang.String`	`StrictTransportSecurity`	A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.
`static java.lang.String`	`Trailer`	The Trailer general field value indicates that the given set of header fields is present in the trailer of a message encoded with chunked transfer coding.
`static java.lang.String`	`TransferEncoding`	The form of encoding used to safely transfer the entity to the user.
`static java.lang.String`	`Upgrade`	Ask the client to upgrade to another protocol.
`static java.lang.String`	`Vary`	Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server.
`static java.lang.String`	`Via`	Informs the client of proxies through which the response was sent.
`static java.lang.String`	`Warning`	A general warning about possible problems with the entity body.
`static java.lang.String`	`WWWAuthenticate`	Indicates the authentication scheme that should be used to access the requested entity.

- Field Detail
  - AccessControlAllowOrigin
```
static final java.lang.String AccessControlAllowOrigin
```
    Specifying which web sites can participate in cross-origin resource sharing.
    Example: Access-Control-Allow-Origin: *
    
    See Also:
    
    Constant Field Values
  - AcceptRanges
```
static final java.lang.String AcceptRanges
```
    What partial content range types this server supports.
    Example: Accept-Ranges: bytes
    
    See Also:
    
    Constant Field Values
  - Age
```
static final java.lang.String Age
```
    The age the object has been in a proxy cache in seconds.
    Example: Age: 12
    
    See Also:
    
    Constant Field Values
  - Allow
```
static final java.lang.String Allow
```
    Valid actions for a specified resource. To be used for a 405 Method not allowed.
    Example: Allow: GET, HEAD
    
    See Also:
    
    Constant Field Values
  - CacheControl
```
static final java.lang.String CacheControl
```
    Tells all caching mechanisms from server to client whether they may cache this object. It is measured in seconds.
    Example: Cache-Control: max-age=3600
    
    See Also:
    
    Constant Field Values
  - Connection
```
static final java.lang.String Connection
```
    Options that are desired for the connection.
    Example: Connection: close
    
    See Also:
    
    Constant Field Values
  - ContentEncoding
```
static final java.lang.String ContentEncoding
```
    The type of encoding used on the data. See HTTP compression.
    Example: Content-Encoding: gzip
    
    See Also:
    
    Constant Field Values
  - ContentLanguage
```
static final java.lang.String ContentLanguage
```
    The language the content is in.
    Example: Content-Language: da
    
    See Also:
    
    Constant Field Values
  - ContentLength
```
static final java.lang.String ContentLength
```
    The length of the response body in octets (8-bit bytes).
    Example: Content-Length: 348
    
    See Also:
    
    Constant Field Values
  - ContentLocation
```
static final java.lang.String ContentLocation
```
    An alternate location for the returned data.
    Example: Content-Location: /index.htm
    
    See Also:
    
    Constant Field Values
  - ContentMD5
```
static final java.lang.String ContentMD5
```
    A Base64-encoded binary MD5 sum of the content of the response.
    Example: Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ==
    
    See Also:
    
    Constant Field Values
  - ContentDisposition
```
static final java.lang.String ContentDisposition
```
    An opportunity to raise a "File Download" dialogue box for a known MIME type with binary format or suggest a filename for dynamic content. Quotes are necessary with special characters.
    Example: Content-Disposition: attachment; filename="fname.ext"
    
    See Also:
    
    Constant Field Values
  - ContentRange
```
static final java.lang.String ContentRange
```
    Where in a full body message this partial message belongs.
    Example: Content-Range: bytes 21010-47021/47022
    
    See Also:
    
    Constant Field Values
  - ContentType
```
static final java.lang.String ContentType
```
    The MIME type of this content.
    Example: Content-Type: text/html; charset=utf-8
    
    See Also:
    
    Constant Field Values
  - Date
```
static final java.lang.String Date
```
    The date and time that the message was sent (in "HTTP-date" format as defined by RFC 7231).
    Example: Date: Tue, 15 Nov 1994 08:12:31 GMT
    
    See Also:
    
    Constant Field Values
  - ETag
```
static final java.lang.String ETag
```
    An identifier for a specific version of a resource, often a message digest.
    Example: ETag: "737060cd8c284d8af7ad3082f209582d"
    
    See Also:
    
    Constant Field Values
  - Expires
```
static final java.lang.String Expires
```
    Gives the date/time after which the response is considered stale.
    Example: Expires: Thu, 01 Dec 1994 16:00:00 GMT
    
    See Also:
    
    Constant Field Values
  - LastModified
```
static final java.lang.String LastModified
```
    The last modified date for the requested object (in "HTTP-date" format as defined by RFC 7231).
    Example: Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT
    
    See Also:
    
    Constant Field Values
  - Link
```
static final java.lang.String Link
```
    Used to express a typed relationship with another resource, where the relation type is defined by RFC 5988.
    Example: Link: ; rel="alternate"
    
    See Also:
    
    Constant Field Values
  - Location
```
static final java.lang.String Location
```
    Used in redirection, or when a new resource has been created.
    Example: Location: http://www.w3.org/pub/WWW/People.html
    
    See Also:
    
    Constant Field Values
  - P3P
```
static final java.lang.String P3P
```
    This field is supposed to set P3P policy, in the form of P3P:CP="your_compact_policy". However, P3P did not take off, most browsers have never fully implemented it, a lot of websites set this field with fake policy text, that was enough to fool browsers the existence of P3P policy and grant permissions for third party cookies.
    Example: P3P: CP= "This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
    
    See Also:
    
    Constant Field Values
  - Pragma
```
static final java.lang.String Pragma
```
    Implementation-specific fields that may have various effects anywhere along the request-response chain.
    Example: Pragma: no-cache
    
    See Also:
    
    Constant Field Values
  - ProxyAuthenticate
```
static final java.lang.String ProxyAuthenticate
```
    Request authentication to access the proxy.
    Example: Proxy-Authenticate: Basic
    
    See Also:
    
    Constant Field Values
  - Refresh
```
static final java.lang.String Refresh
```
    Used in redirection, or when a new resource has been created. This refresh redirects after 5 seconds.
    Example: Refresh: 5; url=http://www.w3.org/pub/WWW/People.html
    
    See Also:
    
    Constant Field Values
  - RetryAfter
```
static final java.lang.String RetryAfter
```
    If an entity is temporarily unavailable, this instructs the client to try again later. Value could be a specified period of time (in seconds) or a HTTP-date.
    Example: Example 1: Retry-After: 120Example 2: Retry-After: Fri, 07 Nov 2014 23:59:59 GMT
    
    See Also:
    
    Constant Field Values
  - Server
```
static final java.lang.String Server
```
    A name for the server.
    Example: Server: Apache/2.4.1 (Unix)
    
    See Also:
    
    Constant Field Values
  - SetCookie
```
static final java.lang.String SetCookie
```
    An HTTP cookie.
    Example: Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1
    
    See Also:
    
    Constant Field Values
  - Status
```
static final java.lang.String Status
```
    CGI header field specifying the status of the HTTP response. Normal HTTP responses use a separate "Status-Line" instead, defined by RFC 7230.
    Example: Status: 200 OK
    
    See Also:
    
    Constant Field Values
  - StrictTransportSecurity
```
static final java.lang.String StrictTransportSecurity
```
    A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.
    Example: Strict-Transport-Security: max-age=16070400; includeSubDomains
    
    See Also:
    
    Constant Field Values
  - Trailer
```
static final java.lang.String Trailer
```
    The Trailer general field value indicates that the given set of header fields is present in the trailer of a message encoded with chunked transfer coding.
    Example: Trailer: Max-Forwards
    
    See Also:
    
    Constant Field Values
  - TransferEncoding
```
static final java.lang.String TransferEncoding
```
    The form of encoding used to safely transfer the entity to the user. Currently defined methods are: chunked, compress, deflate, gzip, identity.
    Example: Transfer-Encoding: chunked
    
    See Also:
    
    Constant Field Values
  - Upgrade
```
static final java.lang.String Upgrade
```
    Ask the client to upgrade to another protocol.
    Example: Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
    
    See Also:
    
    Constant Field Values
  - Vary
```
static final java.lang.String Vary
```
    Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server.
    Example: Vary: *
    
    See Also:
    
    Constant Field Values
  - Via
```
static final java.lang.String Via
```
    Informs the client of proxies through which the response was sent.
    Example: Via: 1.0 fred, 1.1 example.com (Apache/1.1)
    
    See Also:
    
    Constant Field Values
  - Warning
```
static final java.lang.String Warning
```
    A general warning about possible problems with the entity body.
    Example: Warning: 199 Miscellaneous warning
    
    See Also:
    
    Constant Field Values
  - WWWAuthenticate
```
static final java.lang.String WWWAuthenticate
```
    Indicates the authentication scheme that should be used to access the requested entity.
    Example: WWW-Authenticate: Basic
    
    See Also:
    
    Constant Field Values

Interface HttpResponseHeader

Field Summary

Field Detail

AccessControlAllowOrigin

AcceptRanges

Age

Allow

CacheControl

Connection

ContentEncoding

ContentLanguage

ContentLength

ContentLocation

ContentMD5

ContentDisposition

ContentRange

ContentType

Date

ETag

Expires

LastModified

Link

Location

P3P

Pragma

ProxyAuthenticate

Refresh

RetryAfter

Server

SetCookie

Status

StrictTransportSecurity

Trailer

TransferEncoding

Upgrade

Vary

Via

Warning

WWWAuthenticate