Some advice needed on how to use the Host header when using a proxy and confirming its limitations with respect to Host: based proxies.
- Consider a proxy proxy.com on port PA - Consider an origin server or gateway on server.com on port PB - Consider a URL: http://server.com[:PB]/foo.html >From RFC 2616 - 14.23 - the Host header MUST reprsent the naming authority of the origin server. (And one MUST use the Host: header when one is doing HTTP/1.1 (19.6.1.1 - assuming it applies to a client doing a proxy request)). So I need to do tcp-connect( IP-of("proxy.com"), PA) send( GET http://server.com:PB/foo.html HTTP/1.1 Host: server.com:PB ... And the proxy MUST discard the Host: header according to 5.2.1 as there is an absoluteURI. So questions - This is correct ? - Now how I connect to a Host: based proxy ? -> seems impossible. - Why is the Host: header there in this case - as it adds no information and it only can cause conflicts (i.e. an application for getting about 5.2.1). I.e. it seems to make that it almost makes more sense to do as a client during a proxy request: connect( IPof("proxy.com"), PA) send( GET http://server.com/foo.html HTTP/1.1 [Proxy-]Host: proxy.com:PA ..... much along the lines of Proxy-Authenticate et.al. DW -- Dirk-Willem van Gulik
