Getting error when sending POST request to server using MQL4

External question — Stack Overflow Stack Exchange Author: rerat Original post: https://stackoverflow.com/questions/71597695 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 am trying to post data using an MQL4 script to a local server on the same network and I am getting errors. Here is the code: #import "Wininet.dll" int InternetOpenW(string, int, string, string, int); int InternetConnectW(int, string, int, string, string, int, int, int); int InternetOpenUrlW(int, string, string, int, int, int); int InternetReadFile(int, string, int, int& OneInt[]); int InternetCloseHandle(int); int HttpOpenRequestW(int, string, string, string, string, string& AcceptTypes[], int, int); bool HttpSendRequestW(int, string, int, string, int); #import #import "kernel32.dll" int GetLastError(void); #import int OnInit() { string headers = "Content-Type: application/x-www-form-urlencoded"; string data = "test=test"; string acceptTypes[1] = {"*/*"}; int HttpOpen = InternetOpenW("HTTP_Client_Sample", 1, "", "", 0); int HttpConnect = InternetConnectW(HttpOpen, "http://192.168.0.201/api", 7777, "", "", 3, 0, 1); int HttpRequest = HttpOpenRequestW(HttpConnect, "POST", "/index.php", "HTTP/1.1", "", acceptTypes, 0, 1); bool result = HttpSendRequestW(HttpRequest, headers, StringLen(headers), data, StringLen(data)); Alert ("Last MSDN Error =: ", kernel32::GetLastError()); int read[1]; // not used Alert("This is the POST result: ", result); if (HttpOpen > 0) InternetCloseHandle(HttpOpen); if (HttpRequest > 0) InternetCloseHandle(HttpRequest); Alert("DONE"); } So the MSDN error is 6. Tried to look that up, but came up with nothing. The result is false, so obviously not working. Any suggestions would be great.