##  Request fields  [  [ edit
](/w/index.php?title=List_of_HTTP_header_fields&action=edit&section=5 "Edit
section: Request fields") ]

###  Standard request fields  [  [ edit
](/w/index.php?title=List_of_HTTP_header_fields&action=edit&section=6 "Edit
section: Standard request fields") ]

Name  |  Description  |  Example  |  Status  |  Standard   
---|---|---|---|---  
A-IM  |  Acceptable instance-manipulations for the request.  [11]  |  ` A-IM: feed ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 3229 ](https://datatracker.ietf.org/doc/html/rfc3229)  
Accept  |  [ Media type(s) ](/wiki/Media_type "Media type") that is/are acceptable for the response. See [ Content negotiation ](/wiki/Content_negotiation "Content negotiation") .  |  ` Accept: text/html ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Accept-Charset  |  Character sets that are acceptable.  |  ` Accept-Charset: utf-8 ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Accept-Datetime  |  Acceptable version in time.  |  ` Accept-Datetime: Thu, 31 May 2007 20:35:00 GMT ` |  Provisional  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 7089 ](https://datatracker.ietf.org/doc/html/rfc7089)  
Accept-Encoding  |  List of acceptable encodings. See [ HTTP compression ](/wiki/HTTP_compression "HTTP compression") .  |  ` Accept-Encoding: gzip, deflate ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Accept-Language  |  List of acceptable human languages for response. See [ Content negotiation ](/wiki/Content_negotiation "Content negotiation") .  |  ` Accept-Language: en-US ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Access-Control-Request-Method,  
Access-Control-Request-Headers  [12]  |  Initiates a request for [ cross-origin resource sharing ](/wiki/Cross-origin_resource_sharing "Cross-origin resource sharing") with  Origin  (below).  |  ` Access-Control-Request-Method: GET ` |  Permanent: standard  |   
Authorization  |  Authentication credentials for [ HTTP authentication ](/wiki/Basic_access_authentication "Basic access authentication") .  |  ` Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ== ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
[ Cache-Control ](/wiki/Cache-Control "Cache-Control") |  Used to specify directives that _must_ be obeyed by all caching mechanisms along the request-response chain.  |  ` Cache-Control: no-cache ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9111 ](https://datatracker.ietf.org/doc/html/rfc9111)  
Connection  |  Control options for the current connection and list of hop-by-hop request fields.  [13]  Must not be used with HTTP/2.  [14]  |  ` Connection: keep-alive ` ` [ Connection: Upgrade ](/wiki/HTTP/1.1_Upgrade_header "HTTP/1.1 Upgrade header") ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Content-Encoding  |  The type of encoding used on the data. See [ HTTP compression ](/wiki/HTTP_compression "HTTP compression") .  |  ` Content-Encoding: gzip ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Content-Length  |  The length of the request body in [ octets ](/wiki/Octet_\(computing\) "Octet \(computing\)") (8-bit bytes).  |  ` Content-Length: 348 ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Content-MD5  |  A [ Base64 ](/wiki/Base64 "Base64") -encoded binary [ MD5 ](/wiki/MD5 "MD5") sum of the content of