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Question:

How to make correct GET/POST with Host resolving proxy?

May 09 '13 at 20:24

Hey.

My Socks proxy resolves hostnames from "www.google.com.foo.bar" to "www.google.com". What do I have to do that the Google server gets the right host value "www.google.com" and not "www.google.com.foo.bar"?

            Uri uri = new Uri("http://www.google.com/search?q=chilikat");
            string googleHost= "www.google.com";
            string googleHostForResolvingSocksProxy= "www.google.com.foo.bar";

            Chilkat.HttpRequest req = new Chilkat.HttpRequest();
            req.Path = uri.PathAndQuery;
            req.AddHeader("Host", googleHost);

            if(postData!=null)
            {
                    req.HttpVerb = WebRequestMethods.Http.Post;
                    req.ContentType="application/x-www-form-urlencoded;";
                    req.AddParam("name","value");
            }

            Chilkat.HttpResponse resp = http.SynchronousRequest(googleHostForResolvingSocksProxy, 80, false, req);

I think GET is working well, but I can not check it yet (correct host and request headers). POST is definitly not working. I get a "Not Found" error. Probably because of wrong Host header.

What do I have to change? Could you help me please.

BlackMatrix

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Answer

You can see the exact HTTP request sent by setting the http.SessionLogFilename property to the path of a file that the Chilkat.Http object will create/append when sending requests. Once you see what is actually sent, it might provide the clue as to what is wrong..

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Answer

Ah, nice feature. Redirection was the problem. Chilikat is doing a bad request if you get redirected.

It doint the following redirecting GET request:

GET / HTTP/1.1
Accept: */*
Accept-Encoding: gzip
...
User-Agent: Chilkat/1.0.0 (+http://www.chilkatsoft.com/ChilkatHttpUA.asp)
Host: www.google.com
Connection: Keep-Alive

I think I have to define the order and the values of the Chilikat.Http object, not just for HttpRequest. Maybe then Redirection is working with the same headers as the HttpRequest object.

Question: I'm using Send- and SaveCookies from Chilikat.Http. How could I change the order of the headers? Cookie header must be before Connection: Keep-Alive not at the end like the following:

POST / HTTP/1.1
Host: www.google.com
Connection: Keep-Alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 10
Cookie: name=value