5. Mandatory HTTP Requests
An HTTP request is called a mandatory request if it includes at least
one mandatory extension declaration (using the Man or the C-Man header
fields). The method name of a mandatory request MUST be prefixed by
"M-". For example, a client might express the binding rights-
management constraints in an HTTP PUT request as follows:
M-PUT /a-resource HTTP/1.1
Man: "https://www.copyright.org/rights-management"; ns=16
16-copyright: https://www.copyright.org/COPYRIGHT.html
16-contributions: https://www.copyright.org/PATCHES.html
Host: www.w3.org
Content-Length: 1203
Content-Type: text/html
<!doctype html ...
https://www.w3.org/Protocols/HTTP/ietf-ext-wg/draft-frystyk-http-extensions-03
x x x
5. Mandatory HTTP Requests
An HTTP request is