使用 QNetworkRequest 的 HTTP POST 正确格式

问题描述

我正在尝试向 Web 服务发送 JSON 查询，但我继续收到内部服务器错误作为对查询的响应.

I'm trying to send a JSON query to a web service and I continue to get internal server errors as a response to the query.

这是我要发送的内容:

POST /api/1.7/webservice.asmx HTTP/1.1
Host: www.superService.com
User-Agent: My app name v0.1
X-Custom-User-Agent: My app name v0.1
Content-Type: application/json
Content-Length:81

{"method":"AuthenticatePlain","loginName":"username@domain.com","password":"mypass"}

这应该发送到 https://www.superService.com/api/1.7/ssapi.asmx

在编写QNetworkRequest时，用什么方法插入行

In preparing the QNetworkRequest, what method is used to insert the line

POST/api/1.7/webservice.asmx HTTP/1.1?

QNetworkRequest 对象中是否包含完整的标头?
JSON 数据应该在 QNetworkRequest 对象中，还是作为 QNetworkAccessManager::post() 方法中的第二个参数添加到帖子中?

Is the complete header contained in the QNetworkRequest object?
Should the JSON data be in the QNetworkRequest object or is that added to the post as the second argument in the QNetworkAccessManager::post() method?

这是我当前在 on_btnLogin_clicked() 槽中的代码:

Here is my current code in the on_btnLogin_clicked() slot:

connect(m_qnam, SIGNAL(finished(QNetworkReply*)),
                 this, SLOT(handleNetworkData(QNetworkReply*)));
    connect(m_qnam,SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)),
                 this, SLOT(handleSSLErrors(QNetworkReply*)));

    QString baseString = "";
    baseString.append(QString("POST /api/1.7/webservice.asmx HTTP/1.1
").toUtf8());  
    baseString.append(QString("www.superService.com
").toUtf8());
    baseString.append(QString("User-Agent: My app name v0.1
").toUtf8());
    baseString.append(QString("X-Custom-User-Agent: My app name v0.1
").toUtf8());
    baseString.append(QString("Content-Type: application/json
").toUtf8());

    QString jsonString = QString("{");
    jsonString.append(""method":");
    jsonString.append(""AuthenticatePlain"");
    jsonString.append(","loginName":");
    jsonString.append(""username@domain.com"");
    jsonString.append(","password":");
    jsonString.append(""mypass"");
    jsonString.append("}");

    QByteArray json = jsonString.toUtf8();

    baseString.append(QString("Content-Length:").toUtf8());
    baseString.append(QString::number(json.length()));
    baseString.append("
").toUtf8();
    baseString.append(QString("
").toUtf8());
    baseString.append(json);

    request = QNetworkRequest(QUrl("https://www.superService.com/api/1.7/ssapi.asmx"));
    request.setRawHeader()


    qDebug() << "Base String: "<< baseString;


    m_qnam->post(request,baseString.toUtf8());

推荐答案

这不是编写 HTTP 请求的正确方法.下面这段代码更正确:

This is not the right way to write your HTTP request. The following piece of code is more correct :

connect(m_qnam, SIGNAL(finished(QNetworkReply*)), this, SLOT(handleNetworkData(QNetworkReply*)));
connect(m_qnam,SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)), this, SLOT(handleSSLErrors(QNetworkReply*)));

// Build your JSON string as usual
QByteArray jsonString = "{"method":"AuthenticatePlain","loginName":"username@domain.com","password":"mypass"}";

// For your "Content-Length" header
QByteArray postDataSize = QByteArray::number(jsonString.size());

// Time for building your request
QUrl serviceURL("https://www.superService.com/api/1.7/ssapi.asmx");
QNetworkRequest request(serviceURL);

// Add the headers specifying their names and their values with the following method : void QNetworkRequest::setRawHeader(const QByteArray & headerName, const QByteArray & headerValue);
request.setRawHeader("User-Agent", "My app name v0.1");
request.setRawHeader("X-Custom-User-Agent", "My app name v0.1");
request.setRawHeader("Content-Type", "application/json");
request.setRawHeader("Content-Length", postDataSize);

// Use QNetworkReply * QNetworkAccessManager::post(const QNetworkRequest & request, const QByteArray & data); to send your request. Qt will rearrange everything correctly.
QNetworkReply * reply = m_qnam->post(request, jsonString);

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