HTTP Connection fails but returns an error code of 0

Quoted from Forex.com.bd-Editorial External answer — Stack Overflow Stack Exchange Author: Woody1193 Source score (net votes, not local likes): 0 Original post: https://stackoverflow.com/a/75586676 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I found the issue. It turns out that I was setting my flags and service improperly. First, according to this , INTERNET_OPEN_TYPE_DIRECT and INTERNET_OPEN_TYPE_PRECONFIG conflict with each other. So, I removed INTERNET_OPEN_TYPE_DIRECT to tell Windows that I would like to use the network settings stored in the registry. Next, I looked at the Windows documentation, here , and found out that, although INTERNET_SERVICE_HTTPS is defined, both HTTP and HTTPS requests are defined by the INTERNET_SERVICE_HTTP service flag. Finally, I was not including the INTERNET_FLAG_SECURE flag in the right place. I discovered, from this question , that this flag needs to be included on the call to HttpOpenRequestW and including it anywhere else would be redundant. After making all these changes, my code looks like this: HttpRequester::HttpRequester(const string verb, const string host, const string resource, const int port, const bool secure, const string referrer = NULL) { m_ready = false; ResetLastError(); // First, report to Windows the user agent that we'll request HTTP data with. If this fails // then return an error int flags = INTERNET_OPEN_TYPE_PRECONFIG | INTERNET_FLAG_NO_CACHE_WRITE; m_open_handle = InternetOpenW(GetUserAgentString(), flags, NULL, NULL, 0); if (m_open_handle == INTERNET_INVALID_HANDLE) { SetUserError(INTERNET_OPEN_FAILED_ERROR); return; } // Next, attempt to create an intenrnet connection to the URL at the desired port; // if this fails then return an error m_session_handle = InternetConnectW(m_open_handle, host, port, "", "", INTERNET_SERVICE_HTTP, flags, 0); if (m_session_handle == INTERNET_INVALID_HANDLE) { SetUserError(INTERNET_CONNECT_FAILED_ERROR); return; } // Now, if we want a secure connection then add the secure flag to the connection if (secure) { flags |= INTERNET_FLAG_SECURE; } // Finally, open the HTTP request with the session variable, verb and URL; if this fails // then log and return an error string accepts[]; m_request_handle = HttpOpenRequestW(m_session_handle, verb, resource, NULL, referrer, accepts, flags, 0); if (m_request_handle == INTERNET_INVALID_HANDLE) { SetUserError(INTERNET_OPEN_REQUEST_FAILED_ERROR); return; } m_ready = true; }

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