An entity header is an HTTP header that can be used in an HTTP request or response, and describes the content of the body of themessage. Headers like Content-Length, Content-Language, Content-Encoding are entities headers.
Even if they are neither request, nor response headers, entity headers are often included in such terms.
A few request headers after a GET request:
In the following example, Content-Length is an entity header, while Host and User-Agent are requests headers:
POST /myform.html HTTP/1.1 Host: developer.mozilla.org User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:50.0) Gecko/20100101 Firefox/50.0 Content-Length: 128
Learn more
Technical knowledge
- List of all HTTP headers