ProtocolUnknownError upon sending SOAP request in Qt

问题

I am doing a simple example to send a SOAP request in Qt. The attempt is to use QNetwork resources and send a SOAP request to fetch cities in a country.

http://www.webservicex.net/globalweather.asmx?op=GetCitiesByCountry .

Please help; what is missing out. Thanks for any pointers/inputs.

Build machine - Linux Debian

Qt version - 5.7

SSL - 1.0.2 available.

qDebug() << "Support SSL:  " << QSslSocket::supportsSsl()
         << "\nLib Version Number: " << QSslSocket::sslLibraryVersionNumber()
         << "\nLib Version String: " << QSslSocket::sslLibraryVersionString()
         << "\nLib Build Version Number: " << QSslSocket::sslLibraryBuildVersionNumber()
         << "\nLib Build Version String: " << QSslSocket::sslLibraryBuildVersionString();

OUTPUT

Support SSL:   true 
Lib Version Number:  268443855 
Lib Version String:  "OpenSSL 1.0.2l  25 May 2017" 
Lib Build Version Number:  268439647 
Lib Build Version String:  "OpenSSL 1.0.1e-fips 11 Feb 2013"

Error upon running the code

Network error:  QNetworkReply::NetworkError(ProtocolUnknownError)

CODE

#include <QObject>
#include <QtNetwork>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    QNetworkAccessManager manager;

    QNetworkRequest request;

    //Set SOAP headers

    request.setRawHeader("POST", "/globalweather.asmx HTTP/1.1");
    request.setRawHeader("Content-Type", "text/xml;charset=UTF-8");
    request.setRawHeader("Content-Length", "1024");
    request.setRawHeader("SOAPAction", "http://www.webserviceX.NET/GetCitiesByCountry");
    //request.setRawHeader("Host", "www.webservicex.net");
    request.setUrl(QUrl("www.webservicex.net"));


    // Prepare SOAP request XML

    QString query =
    "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
    "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
    "<soap:Body>"
    "<GetCitiesByCountry xmlns=\"http://www.webserviceX.NET\">"
    "<CountryName>Australia</CountryName>"
    "</GetCitiesByCountry>"
    "</soap:Body>"
    "</soap:Envelope>";

    QNetworkReply* reply = manager.post(request, query.toUtf8());

    QEventLoop eventLoop;

    QObject::connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
    eventLoop.exec();

    if (reply->error() != QNetworkReply::NoError)    
        qDebug() << "Network error: " << reply->error();
    else    
        qDebug() << reply->readAll();    

    return app.exec();
 }

Resources referred

http://www.qtcentre.org/threads/29856-sending-soap-request-using-QNetworkAccessManager-question
https://evileg.com/en/post/233/
Qt Web Service post query
Sending HTTP Header Info with Qt QNetworkAccessManager
Sending an HTTP request using QNetworkAccessManager
https://en.wikipedia.org/wiki/List_of_HTTP_header_fields

回答1:

Calling manager.post(request, query.toUtf8()); will overwrite your request.setRawHeader("POST", "/globalweather.asmx HTTP/1.1");

If you would like to use your custom headers and so on, use sendCustomRequest

Or set the correct Uri in QNetworkRequest and use this request in QNetworkAccessManager::post method.

    //request.setRawHeader("POST", "/globalweather.asmx HTTP/1.1");
    request.setRawHeader("Content-Type", "text/xml;charset=UTF-8");
    request.setRawHeader("Content-Length", "1024");
    request.setRawHeader("SOAPAction", "http://www.webserviceX.NET/GetCitiesByCountry");
    //request.setRawHeader("Host", "www.webservicex.net");
    request.setUrl(QUrl("http://www.webservicex.net/globalweather.asmx"));

来源：https://stackoverflow.com/questions/47130736/protocolunknownerror-upon-sending-soap-request-in-qt

标签

c++

soap