无法通过 CHttpFile - C++/MFC 发送开机自检请求

我的目标：我正在尝试提交帖子请求

问题：发布请求未发送、格式不正确或缺少某些信息。我不确定确切的问题。

什么是成功的发布请求：对网站的成功发布请求将更改用户的Country location，这是网站功能的一部分。

当前程序输出：我得到200 -OK响应并且没有错误

附加信息：在下面的代码中，我发出了 2 个请求。

从第一个请求开始，我接收并读取了一个 html 页面以查找RequestDigest值。此值是执行对 SharePoint 网站的提交请求所必需的。

对于第二个请求，我使用找到的RequestDigest值并将其添加到 post 请求中，并将用户的国家/地区更改为加拿大 ("CA"(。

注意：我是C++/MFC的新手，我已经在这个问题上停留了一个多星期！ 任何帮助和/或指导将不胜感激

void CUserPassDiag::Connect(){
    CInternetSession session(_T("My Session"));
    CHttpConnection* pServer = NULL;
    CHttpFile* pFile = NULL;
    char *szBuff = new char[100000];
    try
    {
        // First Request to retrieve the Digest value
        CString strServerName = _T("boration.ptt.ca");
        CString headers = _T("Content-Type: application/x-www-form-urlencodedrn");
        headers += _T("Host: boration.ptt.carn");
        headers += _T("Method: POSTrn");
        headers += _T("Pragma: no-cachern");
        headers += _T("Accept: application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, *//*rn");
        headers += _T("UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E; InfoPath.3rn");
        headers += _T("Keep-Alive: truern");
        headers += _T("Accept-Language: en-CArn");
        headers += _T("Referer: http://boration.ptt.ca/team/physicallocation/_Layouts/Ptt.PhysicalLocationWidget/Page.aspxrn");
        // Headers Ready
        CString szHeaders = _T(headers);
        DWORD dwRet;
        // URL
        CString strObject = _T("/team/D135/SitePages/PttHome.aspx");
        // get connection with username and password
        pServer = session.GetHttpConnection(strServerName, INTERNET_DEFAULT_HTTP_PORT, _T("user"), _T("pass"));
        // open request
        pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_POST, strObject);
        pFile->AddRequestHeaders(szHeaders);
        pFile->SendRequest();
        pFile->QueryInfoStatusCode(dwRet); // response is 200 OK
        // Data is retrieve and can be queried for digest value
        pFile->Read(szBuff,100000);
        CString digest = CString(szBuff);
        std::string str = digest.GetString();
        std::smatch match;
        std::regex re("0x(\d|[A-Z]).*0000");
        if (std::regex_search(str, match, re)){
            digest = CString(std::string(match[0]).c_str());
        }
        // close the server and chttpfile
        pServer->Close();
        pFile->Close();

     /*
      * Second Request Preperation
      */
        // Post data -  CA stands for Canada and this value is added to the post reuquest to change the users country
        CString country = "CA";
        // add a new header
        CString xRequestDigest = "X-RequestDigest: " + digest + _T("rn");
        headers += xRequestDigest;
        // formatting the digest value to be placed in the post request
        digest.Replace(_T(" "),_T("+"));
        digest.Replace(_T(":"),_T("%3A"));
        digest.Replace(_T(","),_T("%2C"));
        // new URL
        strObject = _T("/team/physicallocation/_Layouts/Ptt.PhysicalLocationWidget/Page.aspx");
        // post data to be sent
        CString strFormData = _T("__REQUESTDIGEST=" + digest + "&__VIEWSTATE=%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%2FZGQCBQ8PFgIfDAXlAVRvIGRldGVybWluZSBpZiB0ZWNobmljYWwgZGF0YSBpcyBhY2Nlc3NpYmxlLCB5b3VyIGN1cnJlbnQgcGh5c2ljYWwgbG9jYXRpb24gbXVzdCBiZSBwcm92aWRlZC4gPGJyLz48YnIvPg0KQWxsIHZhbHVlcyBwcm92aWRlZCBhcmUgbG9nZ2VkIGFuZCByZXRhaW5lZCBmb3IgYXVkaXRpbmcgcHVycG9zZXMuPGJyLz48YnIvPk1ha2Ugc3VyZSB0byB1cGRhdGUgbG9jYXRpb24gd2hlbiB0cmF2ZWxsaW5nLiBkZAIHDw8WAh8MBQNZZXNkZAIJDw8WAh8MBQJOb2RkAgMPDxYCHwFnZBYUZg8PFgIfDAU1UGxlYXNlIHNlbGVjdCB5b3VyIGN1cnJlbnQgcGh5c2ljYWwgbG9jYXRpb24gY291bnRyeS5kZAIBDw8WAh8MBQhDb3VudHJ5OmRkAgIPDxYCHwwFC1VzZXIgTmFtZSA6ZGQCAw8PFgIfDAUdUmFuYSwgVGFpbW9vciAgICAgICAgICAgICBQV0NkZAIEDw8WAh8MBQZEYXRlIDpkZAIFDw8WAh8MBQtIb3N0IE5hbWUgOmRkAgYPDxYCHwwFGUY1LU1haW5JUC1pbnRlcm5hbC5wd2MuY2FkZAIIDw8WAh8MBeUBVG8gZGV0ZXJtaW5lIGlmIHRlY2huaWNhbCBkYXRhIGlzIGFjY2Vzc2libGUsIHlvdXIgY3VycmVudCBwaHlzaWNhbCBsb2NhdGlvbiBtdXN0IGJlIHByb3ZpZGVkLiA8YnIvPjxici8%2BDQpBbGwgdmFsdWVzIHByb3ZpZGVkIGFyZSBsb2dnZWQgYW5kIHJldGFpbmVkIGZvciBhdWRpdGluZyBwdXJwb3Nlcy48YnIvPjxici8%2BTWFrZSBzdXJlIHRvIHVwZGF0ZSBsb2NhdGlvbiB3aGVuIHRyYXZlbGxpbmcuIGRkAgoPDxYCHwwFB0NvbmZpcm1kZAILDw8WAh8MBQZDYW5jZWxkZAIFD2QWBAIBDw8WAh8MBQdXYXJuaW5nZGQCBQ8PFgIfDAUFQ2xvc2VkZGQShQ6UJsf5SBoFkPM2ZpdvDrHQ0w%3D%3D&__EVENTVALIDATION=%2FwEWBwKO0pUjAqmflsILAs2u9bkDAr36nu0CAo3uhpUDAubLxrYNAtT449AGHxcQwoL9xE%2FsJbw1%2BBKH5DPplNg%3D&ctl00%24PlaceHolderSearchArea%24ctl01%24ctl00=http%3A%2F%2Fxcollaboration.pwc.ca%2Fteam%2Fphysicallocation&InputKeywords=Search+this+site...&ctl00%24PlaceHolderSearchArea%24ctl01%24ctl04=0&countries="+country+"&ctl00%24PlaceHolderMain%24inpHide="+country+"&ctl00%24PlaceHolderMain%24btnSave=Confirm&__spText1=&__spText2=");

        // Open connection
        pServer = session.GetHttpConnection(strServerName, INTERNET_DEFAULT_HTTP_PORT, _T("user"), _T("pass"));
        pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_POST, strObject);
        // add 'content-length' header
        CString contentLength;
        contentLength.Format("Content-Length: %d",strFormData.GetLength());
        contentLength+= "rn";
        headers += _T(contentLength);
        szHeaders = _T(headers);
        // add the header
        pFile->AddRequestHeaders(szHeaders);
        //make a new request
        bool res = pFile->SendRequest(szHeaders,(LPVOID)(LPCSTR)strFormData ,strFormData.GetLength());
        pFile->QueryInfoStatusCode(dwRet);
        TRACE("n%dn",res);
    }catch(CInternetException* e){
        TCHAR sz[1024];
        e->GetErrorMessage(sz,1024);
        _tprintf_s(_T("ERROR!  %sn"), sz);
        e->Delete();
    }
session.Close();
}