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 the message. Headers like
Content-Encoding are entities headers.
Even if they are neither request, nor response headers, entity headers are often included in such terms.
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
- List of all HTTP headers