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: "http://www.copyright.org/rights-management"; ns=16

    16-copyright: http://www.copyright.org/COPYRIGHT.html

    16-contributions: http://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

5.1 Fulfilling a Mandatory Request

A server MUST NOT claim to have fulfilled any mandatory request unless

it understood and obeyed all the mandatory extension declarations in

the request. This section defines a mechanism for conveying this

information to the client in such a way that it interoperates with

existing HTTP applications and prevents broken servers from giving the

false impression that an extended request was fulfilled by responding

with a 200 (Ok) response without understanding the method.

If any end-to-end mandatory extension declarations were among the

fulfilled extensions then the server MUST include an Ext response

header field in the response. In order to avoid that the Ext header

field inadvertently is cached in an HTTP/1.1 cache, the response MUST

contain a no-cache cache-control directive. If the response is

otherwise cachable, the no-cache cache-control directive SHOULD be

limited to only affect the Ext header field:

    HTTP/1.1 200 OK

    Ext:

    Cache-Control: no-cache="Ext"

    ...

If the mandatory request has been forwarded by an HTTP/1.0

intermediary proxy then this is indicated either directly in the

Request-Line or by the presence of an HTTP/1.1 Via header field. In

this case, the server MUST include an Expires header field with a date

equal to or earlier than the value of the Date header field. If the

response is otherwise cachable by HTTP/1.1 caches, the server SHOULD

include an appropriate max-age cache-control directive:

    HTTP/1.1 200 OK

    Date: Sun, 25 Oct 1998 08:12:31 GMT

    Expires: Sun, 25 Oct 1998 08:12:31 GMT

    Ext:

    Cache-Control: no-cache="Ext", max-age=3600

    ...

If any hop-by-hop mandatory extension declarations were among the

fulfilled extensions then the server MUST include a C-Ext response

header field in the response. The C-Ext header field MUST be protected

by a Connection header field (see [5], section 14.10).

    HTTP/1.1 200 OK

    C-Ext:

    Connection: C-Ext

Frystyk, et al                                           [Page 9]

INTERNET-DRAFT           HTTP Extensions        Wed, Jan 20, 1999

Note, that the Ext and C-Ext header fields are not mutually exclusive;

they can be both be present in a response when  fulfilling mandatory

request containing both hop-by-hop as well as end-to-end mandatory

extension declarations.

https://www.w3.org/Protocols/HTTP/ietf-ext-wg/draft-frystyk-http-extensions-02

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