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HTTP Response Headers

The following list contains valid HTTP response headers. Use these headers to provide information about your HTML document in a meta tag, or to gather information about another document using HttpQueryInfo and QueryInfo.

Constant/valueDescription
ACCEPT
24

Acceptable media types.

ACCEPT-CHARSET
25

Acceptable character sets.

ACCEPT-ENCODING
26

Acceptable content-coding values.

ACCEPT-LANGUAGE
27

Acceptable natural languages.

ACCEPT-RANGES
42

Types of range requests that are accepted.

AGE
48

An estimate of the amount of time since the response was generated at the origin server.

ALLOW
7

Methods supported by the server.

AUTHORIZATION
28

Authorization credentials used for a request.

CACHE-CONTROL
49

Cache control directives.

CONNECTION
23

Options that are specified for a particular connection and must not be communicated by proxies over further connections.

CONTENT-BASE
50

Base URI for resolving relative URLs within the entity.

CONTENT-DESCRIPTION
4

Obsolete. Maintained for legacy application compatibility only.

CONTENT-DISPOSITION
47

Obsolete. Maintained for legacy application compatibility only.

CONTENT-ENCODING
29

Any additional content codings that have been applied to the entire resource.

CONTENT-ID
3

Content identification.

CONTENT-LANGUAGE
6

Language in which the content is presented.

CONTENT-LENGTH
5

Size of the resource, in bytes.

CONTENT-LOCATION
51

Resource location for the entity enclosed in the message.

CONTENT-MD5
52

MD5 digest of the entity-body for the purpose of providing an end-to-end message integrity check (MIC) for the entity-body. For more information, see RFC1864, The Content-MD5 Header Field, at RFC1864: The Content-MD5 Header Field.

CONTENT-RANGE
53

Location in the full entity-body where the partial entity-body should be inserted and the total size of the full entity-body.

CONTENT-TRANSFER_ENCODING
2

Additional content coding that has been applied to the resource.

CONTENT-TYPE
1

Content type of the resource (such as text/html).

COOKIE
44

Cookies associated with the request.

COST
15

Not supported.

DATE
9

Date and time at which the message was originated.

DERIVED-FROM
14

Not supported.

ECHO-HEADERS
73

Not implemented.

ECHO-HEADERS-CRLF
74

Not implemented.

ECHO-REPLY
72

Not implemented.

ECHO-REQUEST
71

Not implemented.

ETAG
54

Entity tag for the associated entity.

EXPECT
68

Expect header, which indicates whether the client application should expect 100 series responses.

EXPIRES
10

Date and time after which the resource should be considered outdated.

FORWARDED
30

Obsolete. Maintained for legacy application compatibility only.

FROM
31

E-mail address for the human user who controls the requesting user agent if the From header is given.

HOST
55

Internet host and port number of the resource being requested.

IF-MATCH
56

Contents of the If-Match request-header field.

IF-MODIFIED-SINCE
32

Contents of the If-Modified-Since header.

IF-NONE-MATCH
57

Contents of the If-None-Match request-header field.

IF-RANGE
58

Contents of the If-Range request-header field. This header allows the client application to check if the entity related to a partial copy of the entity in the client application's cache has not been updated. If the entity has not been updated, send the parts that the client application is missing. If the entity has been updated, send the entire updated entity.

IF-UNMODIFIED-SINCE
59

Contents of the If-Unmodified-Since request-header field.

LAST-MODIFIED
11

Date and time at which the server believes the resource was last modified.

LINK
16

Obsolete. Maintained for legacy application compatibility only.

LOCATION
33

Absolute URI.

MAX
75

Not a query flag. Indicates the maximum value of an * value.

MAX-FORWARDS
60

Number of proxies or gateways that can forward the request to the next inbound server.

MESSAGE-ID
12

Not supported.

MIME-VERSION
0

Version of the MIME protocol that was used to construct the message.

MSTHEMECOMPATIBLE

Internet Explorer 6 and later. Disables theming support for a Web page. The content attribute of the meta element must be set to no.

MSTHEMECOMPATIBLE

Disables theming support for a document. The content attribute of the meta element must be set to no.

ORIG-URI
34

Obsolete. Maintained for legacy application compatibility only.

PRAGMA
17

Implementation-specific directives that might apply to any recipient along the request/response chain.

PROXY-AUTHENTICATE
41

Authentication scheme and realm returned by the proxy.

PROXY-AUTHORIZATION
61

Header that is used to identify the user to a proxy that requires authentication. This header can only be retrieved before the request is sent to the server.

PROXY-CONNECTION
69

Proxy-Connection header.

PUBLIC
8

Methods available at this server.

RANGE
62

Byte range of an entity.

RAW-HEADERS
21

All the headers returned by the server. Each header is terminated by "\0". An additional "\0" terminates the list of headers.

RAW-HEADERS-CRLF
22

All the headers returned by the server. Each header is separated by a CR/LF sequence.

REFERER
35

URI of the resource where the requested URI was obtained.

REFRESH
46

Obsolete. Maintained for legacy application compatibility only.

REQUEST-METHOD
45

Verb that is used in the request, typically GET or POST.

RETRY-AFTER
36

Amount of time the service is expected to be unavailable.

SERVER
37

Information about the software used by the origin server to handle the request.

SET-COOKIE
43

Value of the cookie set for the request.

STATUS-CODE
19

Status code returned by the server. For a list of possible values, see HTTP Status Codes.

STATUS-TEXT
20

Any additional text returned by the server on the response line.

TITLE
38

Obsolete. Maintained for legacy application compatibility only.

TRANSFER-ENCODING
63

Type of transformation that has been applied to the message body so it can be safely transferred between the sender and recipient.

UNLESS-MODIFIED-SINCE
70

Unless-Modified-Since header.

UPGRADE
64

Additional communication protocols that are supported by the server.

URI
13

Some or all of the URIs by which the Request-URI resource can be identified.

USER-AGENT
39

Information about the user agent that made the request.

VARY
65

Header that indicates that the entity was selected from a number of available representations of the response using server-driven negotiation.

VERSION
18

Last response code returned by the server.

VIA
66

Intermediate protocols and recipients between the user agent and the server on requests, and between the origin server and the client on responses.

WARNING
67

Additional information about the status of a response that might not be reflected by the response status code.

WWW-AUTHENTICATE
40

Authentication scheme and realm returned by the server.

Remarks

A response header can be created using the HTTP-EQUIV attribute of the meta tag.

Corresponding values are provided for use with HttpQueryInfo and QueryInfo.

In Internet Explorer 6, The MSTHEMECOMPATIBLE constant disables theming support within Web pages.

Requirements

Minimum supported client

Windows XP

Minimum supported server

Windows 2000 Server

 

 

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