GetLastError returns 6 after call to WinHttpSendRequest

Question

I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this.

Thanks in advance.

i Have the following code:

void QtGuiApplication::getBtnClick() {
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer;
    BOOL  bResults = FALSE;
    HINTERNET  hSession = NULL,
        hConnect = NULL,
        hRequest = NULL;

    // Use WinHttpOpen to obtain a session handle.
    hSession = WinHttpOpen(L"WinHTTP Example/1.0",
        WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
        WINHTTP_NO_PROXY_NAME,
        WINHTTP_NO_PROXY_BYPASS, 0);

    // Specify an HTTP server.
    if (hSession) {

        hConnect = WinHttpConnect(hSession, L"127.0.0.1",
            INTERNET_DEFAULT_HTTP_PORT, 0);
    }
    else {
        qDebug("Error has WinHttpOpen");
        QString errorStr = QString::number(GetLastError());
        qDebug(qPrintable(errorStr));
    }



    // Create an HTTP request handle.
    if (hConnect) {
        hRequest = WinHttpOpenRequest(hConnect, L"GET", NULL,
            NULL, WINHTTP_NO_REFERER,
            WINHTTP_DEFAULT_ACCEPT_TYPES,
            WINHTTP_FLAG_SECURE);
    }
    else {
        qDebug("Error has WinHttpConnect");
        QString errorStr = QString::number(GetLastError());
        qDebug(qPrintable(errorStr));
    }


    // Send a request.
    if (hRequest) {
        bResults = WinHttpSendRequest(hRequest,
            WINHTTP_NO_ADDITIONAL_HEADERS,
            0, WINHTTP_NO_REQUEST_DATA, 0,
            0, 0);
    }
    else {
        qDebug("Error has WinHttpOpenRequest");
        QString errorStr = QString::number(GetLastError());
        qDebug(qPrintable(errorStr));
    }


    // End the request.
    if (bResults) {
        bResults = WinHttpReceiveResponse(hRequest, NULL);
    }
    else {
        qDebug("Error has WinHttpSendRequest");
        QString errorStr = QString::number(GetLastError());
        qDebug(qPrintable(errorStr));
    }


    // Keep checking for data until there is nothing left.
    if (bResults)
        do
        {
            // Check for available data.
            dwSize = 0;
            if (!WinHttpQueryDataAvailable(hRequest, &dwSize))
                printf("Error %u in WinHttpQueryDataAvailable.\n", GetLastError());

            // Allocate space for the buffer.
            pszOutBuffer = new char[dwSize + 1];
            if (!pszOutBuffer)
            {
                printf("Out of memory\n");
                dwSize = 0;
            }
            else
            {
                // Read the Data.
                ZeroMemory(pszOutBuffer, dwSize + 1);

                if (!WinHttpReadData(hRequest, (LPVOID)pszOutBuffer,
                    dwSize, &dwDownloaded))
                    printf("Error %u in WinHttpReadData.\n", GetLastError());
                else
                    qDebug(pszOutBuffer);

                // Free the memory allocated to the buffer.
                delete[] pszOutBuffer;
            }

        } while (dwSize > 0);


        // Report any errors.
        if (!bResults) {
            qDebug("Error has occurred");
            QString str = QString::number(GetLastError());
            qDebug(qPrintable(str));
        }


        // Close any open handles.
        if (hRequest) WinHttpCloseHandle(hRequest);
        if (hConnect) WinHttpCloseHandle(hConnect);
        if (hSession) WinHttpCloseHandle(hSession);
}

I try to access the local server through winhttp. The browser can normally access 127.0.0.1.

bResults = WinHttpSendRequest(hRequest,
            WINHTTP_NO_ADDITIONAL_HEADERS,
            0, WINHTTP_NO_REQUEST_DATA, 0,
            0, 0);

error var GetLastError returns 6 after call to WinHttpSendRequest

The code of the service running with springboot is as follows

@Controller
public class MyController {
    @ResponseBody
    @RequestMapping("")
    public String home() {
        return "Home";
    }
}

Springboot run information: Tomcat started on port(s): 80 (http) with context path ''

Using winhttp API to access services, Get springboot error information

I've tried a lot of ways, and it's still useless.

For example, modify the springboot port and winhttp API request port to 8089.

Answer 1

From WinHttpConnect

INTERNET_DEFAULT_HTTP_PORT

Uses the default port for HTTP servers (port 80).

INTERNET_DEFAULT_HTTPS_PORT

Uses the default port for HTTPS servers (port 443). Selecting this port does not automatically establish a secure connection. You must still specify the use of secure transaction semantics by using the WINHTTP_FLAG_SECURE flag with WinHttpOpenRequest.

The :80 part is the TCP port. You can consider these ports as communications endpoints on a particular IP address (in the case of localhost - 127.0.0.1). The IANA is responsible for maintaining the official assignments of standard port numbers for specific services. Port 80 happens to be the standard port for HTTP.

Refer: What's the whole point of “localhost”, hosts and ports at all?

So you need to change INTERNET_DEFAULT_HTTPS_PORT to INTERNET_DEFAULT_HTTP_PORT.