MS Http Server API (< Win 8) and WebSockets - c++

Question

I try to realize WebSocket protocol at MS Http Server API under win server 2008 (haven't HTTP_SEND_RESPONSE_FLAG_OPAQUE flag).
HTTP_RESPONSE response={0};
const char upgrade_val[]="Websocket";
response.Headers.KnownHeaders[HttpHeaderUpgrade].RawValueLength=strlen(upgrade_val);
response.Headers.KnownHeaders[HttpHeaderUpgrade].pRawValue =upgrade_val;
const char connection_val[]="Upgrade";
response.Headers.KnownHeaders[HttpHeaderConnection].RawValueLength=strlen(connection_val);
response.Headers.KnownHeaders[HttpHeaderConnection].pRawValue =connection_val;
HTTP_UNKNOWN_HEADER unknown[1];
response.Headers.UnknownHeaderCount=1;
response.Headers.pUnknownHeaders =unknown;
const char accept_name[]="Sec-WebSocket-Accept";
unknown[0].NameLength =_countof(accept_name)-1;
unknown[0].pName =accept_name;
unknown[0].RawValueLength=HANDSHAKE_KEY_LENGTH;
unknown[0].pRawValue =base64_key;
response.Version.MajorVersion=1;
response.Version.MinorVersion=1;
response.StatusCode =HTTP_SWITCHING_PROTOCOLS;
const char reason[] ="Switching Protocols";
response.ReasonLength =strlen(reason);
response.pReason =reason;
HttpSendHttpResponse(iocp,RequestId,HTTP_SEND_RESPONSE_FLAG_MORE_DATA,&raw_response,NULL,NULL,NULL,NULL,NULL,NULL);
Browser send header (from Fiddler)
GET http://server.host/ HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: server.host
Origin: null
Pragma: no-cache
Cache-Control: no-cache
Sec-WebSocket-Key: V86c1TFOwWfZqhS42C0arA==
Sec-WebSocket-Version: 13
Sec-WebSocket-Extensions: x-webkit-deflate-frame
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.94 Safari/537.36
server's response (from Fiddler)
HTTP/1.1 101 Switching Protocols
Upgrade: Websocket
Server: Microsoft-HTTPAPI/2.0
Sec-WebSocket-Accept: 3io2SU7uJIeFlwy0+OFJUDNrA44=
Date: Tue, 28 May 2013 09:27:59 GMT
EndTime: 13:27:59.006
ReceivedBytes: 0
SentBytes: 0
and browser shows 1016 error.

Answer 1

Assuming your Sec-WebSocket-Accept header value is calculated correctly, and assuming your response variable is supposed to be named raw_response instead, then your response is missing the required Connection: Upgrade header despite your code assigning a value for it.

Answer 2

HTTP_SEND_RESPONSE_FLAG_OPAQUE (Windows 8 and later) is required for WebSockets.
WebSocket servers on Windows Server (2011-12-20)
As it stands right now, Server 2008/R2 boxes cannot host WebSockets.
At least, not whilst sharing ports 80 and 443 with IIS web server
Re: [hybi] WebSocket protocol as it stands (2010-11-06)
we need to tweak http.sys to recognize what is really a non-HTTP
request, as an HTTP request