110)  
Content-Language  |  The natural language or languages of the intended audience for the enclosed content  [51]  |  ` Content-Language: da ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Content-Length  |  The length of the response 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-Location  |  An alternate location for the returned data  |  ` Content-Location: /index.htm ` |  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 the response  |  ` Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ== ` |  Obsolete  [15]  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 1544 ](https://datatracker.ietf.org/doc/html/rfc1544) , [ 1864 ](https://datatracker.ietf.org/doc/html/rfc1864) , [ 4021 ](https://datatracker.ietf.org/doc/html/rfc4021)  
Content-Range  |  Where in a full body message this partial message belongs  |  ` Content-Range: bytes 21010-47021/47022 ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Content-Type  |  The [ MIME type ](/wiki/MIME_type "MIME type") of this content  |  ` Content-Type: text/html; charset=utf-8 ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Date  |  The date and time that the message was sent (in "HTTP-date" format as defined by RFC 9110)  |  ` Date: Tue, 15 Nov 1994 08:12:31 GMT ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Delta-Base  |  Specifies the delta-encoding entity tag of the response.  [11]  |  ` Delta-Base: "abc" ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 3229 ](https://datatracker.ietf.org/doc/html/rfc3229)  
[ ETag ](/wiki/HTTP_ETag "HTTP ETag") |  An identifier for a specific version of a resource, often a [ message digest ](/wiki/Message_digest "Message digest") |  ` ETag: "737060cd8c284d8af7ad3082f209582d" ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Expires  |  Gives the date/time after which the response is considered stale (in "HTTP-date" format as defined by RFC 9110)  |  ` Expires: Thu, 01 Dec 1994 16:00:00 GMT ` |  Permanent: standard  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9111 ](https://datatracker.ietf.org/doc/html/rfc9111)  
IM  |  Instance-manipulations applied to the response.  [11]  |  ` IM: feed ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 3229 ](https://datatracker.ietf.org/doc/html/rfc3229)  
Last-Modified  |  The last modified date for the requested object (in "HTTP-date" format as defined by RFC 9110)  |  ` Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT ` |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 9110 ](https://datatracker.ietf.org/doc/html/rfc9110)  
Link  |  Used to express a typed relationship with another resource, where the relation type is defined by RFC 5988  |  ` Link: </feed>; rel="alternate" ` [52]  |  Permanent  |  [ RFC ](/wiki/RFC_\(identifier\) "RFC \(identifier\)") [ 5988 ](https://datatracker.ietf.org/doc/html/rfc5988)  
[ Location ](/wiki/HTTP_location "HTTP location") |  Used in [ redirection ](/wiki/URL_redirection "URL redirection") , or when a new resource has been created.  | 

  * Example 1: ` Location: http://www.w3.org/pub/WWW/People.html `
  * Example 2: ` Location: /pub/WWW/People.html `

|  Permanent  |  [ RFC ](/wiki/RFC_