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HttpRequestHeader Enumeration

The HTTP headers that may be specified in a client request.

Namespace:  System.Net
Assembly:  System (in System.dll)

public enum class HttpRequestHeader

Member nameDescription
Supported by Portable Class LibraryCacheControlThe Cache-Control header, which specifies directives that must be obeyed by all cache control mechanisms along the request/response chain.
Supported by Portable Class LibraryConnectionThe Connection header, which specifies options that are desired for a particular connection.
Supported by Portable Class LibraryDateThe Date header, which specifies the date and time at which the request originated.
Supported by Portable Class LibraryKeepAliveThe Keep-Alive header, which specifies a parameter used into order to maintain a persistent connection.
Supported by Portable Class LibraryPragmaThe Pragma header, which specifies implementation-specific directives that might apply to any agent along the request/response chain.
Supported by Portable Class LibraryTrailerThe Trailer header, which specifies the header fields present in the trailer of a message encoded with chunked transfer-coding.
Supported by Portable Class LibraryTransferEncodingThe Transfer-Encoding header, which specifies what (if any) type of transformation that has been applied to the message body.
Supported by Portable Class LibraryUpgradeThe Upgrade header, which specifies additional communications protocols that the client supports.
Supported by Portable Class LibraryViaThe Via header, which specifies intermediate protocols to be used by gateway and proxy agents.
Supported by Portable Class LibraryWarningThe Warning header, which specifies additional information about that status or transformation of a message that might not be reflected in the message.
Supported by Portable Class LibraryAllowThe Allow header, which specifies the set of HTTP methods supported.
Supported by Portable Class LibraryContentLengthThe Content-Length header, which specifies the length, in bytes, of the accompanying body data.
Supported by Portable Class LibraryContentTypeThe Content-Type header, which specifies the MIME type of the accompanying body data.
Supported by Portable Class LibraryContentEncodingThe Content-Encoding header, which specifies the encodings that have been applied to the accompanying body data.
Supported by Portable Class LibraryContentLanguageThe Content-Langauge header, which specifies the natural language(s) of the accompanying body data.
Supported by Portable Class LibraryContentLocationThe Content-Location header, which specifies a URI from which the accompanying body may be obtained.
Supported by Portable Class LibraryContentMd5The Content-MD5 header, which specifies the MD5 digest of the accompanying body data, for the purpose of providing an end-to-end message integrity check.
Supported by Portable Class LibraryContentRangeThe Content-Range header, which specifies where in the full body the accompanying partial body data should be applied.
Supported by Portable Class LibraryExpiresThe Expires header, which specifies the date and time after which the accompanying body data should be considered stale.
Supported by Portable Class LibraryLastModifiedThe Last-Modified header, which specifies the date and time at which the accompanying body data was last modified.
Supported by Portable Class LibraryAcceptThe Accept header, which specifies the MIME types that are acceptable for the response.
Supported by Portable Class LibraryAcceptCharsetThe Accept-Charset header, which specifies the character sets that are acceptable for the response.
Supported by Portable Class LibraryAcceptEncodingThe Accept-Encoding header, which specifies the content encodings that are acceptable for the response.
Supported by Portable Class LibraryAcceptLanguageThe Accept-Langauge header, which specifies that natural languages that are preferred for the response.
Supported by Portable Class LibraryAuthorizationThe Authorization header, which specifies the credentials that the client presents in order to authenticate itself to the server.
Supported by Portable Class LibraryCookieThe Cookie header, which specifies cookie data presented to the server.
Supported by Portable Class LibraryExpectThe Expect header, which specifies particular server behaviors that are required by the client.
Supported by Portable Class LibraryFromThe From header, which specifies an Internet E-mail address for the human user who controls the requesting user agent.
Supported by Portable Class LibraryHostThe Host header, which specifies the host name and port number of the resource being requested.
Supported by Portable Class LibraryIfMatchThe If-Match header, which specifies that the requested operation should be performed only if the client's cached copy of the indicated resource is current.
Supported by Portable Class LibraryIfModifiedSinceThe If-Modified-Since header, which specifies that the requested operation should be performed only if the requested resource has been modified since the indicated data and time.
Supported by Portable Class LibraryIfNoneMatchThe If-None-Match header, which specifies that the requested operation should be performed only if none of client's cached copies of the indicated resources are current.
Supported by Portable Class LibraryIfRangeThe If-Range header, which specifies that only the specified range of the requested resource should be sent, if the client's cached copy is current.
Supported by Portable Class LibraryIfUnmodifiedSinceThe If-Unmodified-Since header, which specifies that the requested operation should be performed only if the requested resource has not been modified since the indicated date and time.
Supported by Portable Class LibraryMaxForwardsThe Max-Forwards header, which specifies an integer indicating the remaining number of times that this request may be forwarded.
Supported by Portable Class LibraryProxyAuthorizationThe Proxy-Authorization header, which specifies the credentials that the client presents in order to authenticate itself to a proxy.
Supported by Portable Class LibraryRefererThe Referer header, which specifies the URI of the resource from which the request URI was obtained.
Supported by Portable Class LibraryRangeThe Range header, which specifies the the sub-range(s) of the response that the client requests be returned in lieu of the entire response.
Supported by Portable Class LibraryTeThe TE header, which specifies the transfer encodings that are acceptable for the response.
Supported by Portable Class LibraryTranslateThe Translate header, a Microsoft extension to the HTTP specification used in conjunction with WebDAV functionality.
Supported by Portable Class LibraryUserAgentThe User-Agent header, which specifies information about the client agent.

The appropriate contents of various headers are described in detail in the HTTP/1.1 specification, available at rfc2616.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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