Network Working Group R. Fielding Request for Comments: 2616 ...

An example is:Location: http://www.w3.org/pub/WWW/People.htmlNote: The Content-Location header field (section 14.14) differsfrom Location in that the Content-Location identifies the originallocation of the entity enclosed in the request. It is thereforepossible for a response to contain header fields for both Locationand Content-Location. Also see section 13.10 for cacherequirements of some methods.Fielding, et al. Standards Track [Page 135]RFC 2616 HTTP/1.1 June 199914.31 Max-ForwardsThe Max-Forwards request-header field provides a mechanism with theTRACE (section 9.8) and OPTIONS (section 9.2) methods to limit thenumber of proxies or gateways that can forward the request to thenext inbound server. This can be useful when the client is attemptingto trace a request chain which appears to be failing or looping inmid-chain.Max-Forwards = "Max-Forwards" ":" 1*DIGITThe Max-Forwards value is a decimal integer indicating the remainingnumber of times this request message may be forwarded.Each proxy or gateway recipient of a TRACE or OPTIONS requestcontaining a Max-Forwards header field MUST check and update itsvalue prior to forwarding the request. If the received value is zero(0), the recipient MUST NOT forward the request; instead, it MUSTrespond as the final recipient. If the received Max-Forwards value isgreater than zero, then the forwarded message MUST contain an updatedMax-Forwards field with a value decremented by one (1).The Max-Forwards header field MAY be ignored for all other methodsdefined by this specification and for any extension methods for whichit is not explicitly referred to as part of that method definition.14.32 PragmaThe Pragma general-header field is used to include implementationspecificdirectives that might apply to any recipient along therequest/response chain. All pragma directives specify optionalbehavior from the viewpoint of the protocol; however, some systems