HTTP Request Header Authorization

External

https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.8

Internal

• HTTP Request

Overview

A user agent that wishes to authenticate itself with a server may include an "Authorization: " request-header field with the request. The Authorization field value contains credentials:

Authorization: <credentials>

     HTTP access authentication is described in "HTTP Authentication:
     Basic and Digest Access Authentication" [43]. If a request is
     authenticated and a realm specified, the same credentials SHOULD
     be valid for all other requests within this realm (assuming that
     the authentication scheme itself does not require otherwise, such
     as credentials that vary according to a challenge value or using
     synchronized clocks).
     When a shared cache (see section 13.7) receives a request
     containing an Authorization field, it MUST NOT return the
     corresponding response as a reply to any other request, unless one
     of the following specific exceptions holds:
     1. If the response includes the "s-maxage" cache-control
        directive, the cache MAY use that response in replying to a
        subsequent request. But (if the specified maximum age has
        passed) a proxy cache MUST first revalidate it with the origin
        server, using the request-headers from the new request to allow
        the origin server to authenticate the new request. (This is the
        defined behavior for s-maxage.) If the response includes "s-
        maxage=0", the proxy MUST always revalidate it before re-using
        it.
     2. If the response includes the "must-revalidate" cache-control
        directive, the cache MAY use that response in replying to a
        subsequent request. But if the response is stale, all caches
        MUST first revalidate it with the origin server, using the
        request-headers from the new request to allow the origin server
        to authenticate the new request.
     3. If the response includes the "public" cache-control directive,
        it MAY be returned in reply to any subsequent request.