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qt - 带有标头的 QNetworkRequest

问题描述

我正在使用 Qt 与 GraphQL 主机进行交互。我正在使用QNetworkRequest，并且登录过程做得很好，给了我一个tokenJSON 格式的。从那时起，GraphQL 期望token位于 HTTP 标头中：

{
   "Authorization": "Bearer <token>"
}

测试服务器，我写了一小段 Python 代码，效果很好：

headers = {'Authorization': "Bearer {0}".format(token)}
url = "http://example.com:8000/graphql"
params = {'query': '{fieldQueries{fields(userId:"xxx"){fieldName fieldID}}}'} 
result = requests.post(url, params=params, headers=headers)
print(result.json())

下面的代码应该在 Qt 中执行相同的操作：

QUrl url = QUrl("http://example.com:8000/graphql");
QNetworkAccessManager * mgr = new QNetworkAccessManager(this);
QNetworkRequest request(url);
QString query = QString("{fieldQueries{fields(userId:\"%1\"){fieldName fieldID}}}").arg(userId);
QUrlQuery params;
params.addQueryItem("query", query);

connect(mgr, SIGNAL(finished(QNetworkReply*)), this, SLOT(onQueryFinish(QNetworkReply*)));
connect(mgr, SIGNAL(finished(QNetworkReply*)), mgr, SLOT(deleteLater()));

auto header = QString("Bearer %1").arg(token);
request.setRawHeader(QByteArray("Authorization"), header.toUtf8());

mgr->post(request, params.query().toUtf8());

但是，服务器返回一个internal server error (500).

一旦我注释掉request.setRawHeader，服务器就会返回You are not authorized to run this query.\nNot authenticated而没有错误。

工作包：

...POST /graphql?query=%7BfieldQueries%7Bfields%28userId%3A%22xxx%22%29%7BfieldName+fieldID%7D%7D%7D
HTTP/1.1..Host: xxx:8000..
User-Agent: python-requests/2.21.0..
Accept-Encoding: gzip, deflate..
Accept: */*..
Connection: keep-alive..
Content-Type: application/json..
Authorization: Bearer <688 bytes token>..Content-Length: 0....

Qt 生成的包：

....POST /graphql HTTP/1.1..Host: xxx:8000..
Authorization: Bearer <364 bytes token>..
Content-Type: application/json..
Content-Length: 113..
Connection: Keep-Alive..
Accept-Encoding: gzip, deflate..
Accept-Language: en-US,*..
User-Agent: Mozilla/5.0....

和

.e..query=%7BfieldQueries%7Bfields(useId:%22xxx%22)%7BfieldName fieldID%7D%7D%7D

标签： qthttp-headersgraphql

解决方案

Graphql接受POST 和 GET 请求。因此，我使用 GET 而不是 post。它将查询作为 URL 的一部分发送，而不是标题，从捕获的数据包中我意识到它们是作为正文发送的。解决方法如下：

QNetworkAccessManager * mgr = new QNetworkAccessManager(this);
QString query = QString("{fieldQueries{fields(userId:\"%1\"){fieldName fieldID}}}").arg(userId);
QUrl url = QUrl(QString("http://example.com:8000/graphql?query=%1").arg(query));
QNetworkRequest request(url);

connect(mgr, SIGNAL(finished(QNetworkReply*)), this, SLOT(onQueryFinish(QNetworkReply*)));
connect(mgr, SIGNAL(finished(QNetworkReply*)), mgr, SLOT(deleteLater()));

auto header = QString("Bearer %1").arg(token);
request.setRawHeader(QByteArray("Authorization"), header.toUtf8());

mgr->get(request);

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