POST request using sockets C# -

i'm trying make auction sniper site. place bid need send 4 parameters(and cookies of course) /auction/place_bid. need use sockets, not httpwebrequest. here's code:

        string request1 = "post /auction/place_bid http/1.1\r\nhost: *host here*\r\nconnection: keep-alive\r\nuser-agent: mozilla/4.0 (compatible; msie 6.0; windows nt 5.2; .net clr 1.0.3705;)\r\naccept: /*\r\ncontent-type: application/x-www-form-urlencoded; charset=utf-8\r\nx-requested-with: xmlhttprequest\r\n" + cookies +"\r\n";         string request3 = "token=" + token + "&aid=" + aid + "&bidreq=" + ptzreq + "&recaptcha_challenge_field=" + rcf + "&recaptcha_response_field=" + rrf+"\r\n\r\n";         string request2 = "content-length: " + (encoding.utf8.getbytecount(request1+request3)+23).tostring() + "\r\n";         byte[] datasent = encoding.utf8.getbytes(request1+request2+request3);         byte[] datareceived = new byte[10000];         socket socket = connectsocket(server, 80);         if (socket == null)         {             return null;         }         socket.send(datasent, datasent.length, 0);         int bytes = 0;         string page = "";                 {             bytes = socket.receive(datareceived, datareceived.length, 0);             page = page + encoding.ascii.getstring(datareceived, 0, bytes);         }         while (bytes > 0);          return page; 

when i'm trying receive webpage visual studio says "operation on unblocked socket cannot completed immediatly", when add

socket.blocking = true; 

my application stops responsing , after ~1 minute returns page, it's empty! when i'm trying make request works perfect. hope me. way, first time when use sockets code pretty bad, sorry that.

*i'm using connectsocket class, given example @ msdn (the link leads russian msdn, sorry, didn't find same article in english, you'll understand code anyway)

the content-length header should indicate size of content. you're setting total size of headers and content.

encoding.utf8.getbytecount(request1+request3)+23).tostring() 

since content part of message request3, server patiently waiting bytecount(request1)+23 more bytes of content never send.

try instead:

"content-length: " + encoding.utf8.getbytecount(request3).tostring() + "\r\n" 

---

another issue looks loop:

do {     bytes = socket.receive(datareceived, datareceived.length, 0);     page = page + encoding.ascii.getstring(datareceived, 0, bytes); } while (bytes > 0); 

since non-blocking socket operations return whether or not they've completed yet, need loop keeps calling receive() until operation has completed. here, if call receive() returns 0 (which first time) exit loop.

you should @ least change while (bytes <= 0) @ least data (probably first packet's worth or so). ideally, should keep calling receive() until see content-length header in reply, continue calling receive() until end of headers, read content-length more bytes.

since you're using sockets, have re-implement http protocol.