pyqt4 - QtWebKit:控制每个http请求可以消耗的时间

Question

在QtWebKit中，有没有一种方法可以控制每个HTTP请求的超时时间？例如，如果我为每个 HTTP 请求设置 3 秒，如果 3 秒后请求未完成，则请求中止并开始其他请求。

我检查了 QNetworkAccessManager API 引用，但找不到合适的解决方案。

Answer 1

没有自定义超时的内置方法。有一个bug report那已经开放多年了。解决此问题的一种方法是使用您的请求启动自定义 QTimer 并将 timeout 信号连接到回复的 abort 方法。

一个简单的例子:

import sys
from PyQt4 import QtGui, QtCore, QtNetwork

class Window(QtGui.QWidget):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        self.output = QtGui.QPlainTextEdit()
        # google won't respond to port 81, so it's a way to get timeout
        self.url = QtGui.QLineEdit('http://www.google.com:81')
        self.button = QtGui.QPushButton('Get')
        self.button.clicked.connect(self.getPage)

        navigateLayout = QtGui.QHBoxLayout()
        navigateLayout.addWidget(self.url)
        navigateLayout.addWidget(self.button)
        layout = QtGui.QVBoxLayout()
        layout.addLayout(navigateLayout)
        layout.addWidget(self.output)
        self.setLayout(layout)

        self.manager = QtNetwork.QNetworkAccessManager(self)
        # slot to process finished requests
        self.manager.finished.connect(self.finished)

        self.timeoutTimer = QtCore.QTimer()
        # it only needs to fire once
        self.timeoutTimer.setSingleShot(True)
        # just to see that we aborted
        self.timeoutTimer.timeout.connect(self.aborted)

    def getPage(self):
        url = QtCore.QUrl(self.url.text())
        # request that page
        # `reply` will be the QNetworkReply we'll get our data
        reply = self.manager.get(QtNetwork.QNetworkRequest(url))

        # set our timeout to abort request
        self.timeoutTimer.timeout.connect(reply.abort)
        # start timer (3000ms = 3s)
        self.timeoutTimer.start(3000)

    def finished(self, reply):
        # everything went smoothly and we got our reply before timeout
        # no need to abort now. so stop the timer
        self.timeoutTimer.stop()

        # do something interesting with the result
        status = reply.attribute(QtNetwork.QNetworkRequest.HttpStatusCodeAttribute).toString()
        self.output.appendPlainText('finished (status code %s)' % status)

    def aborted(self):
        # timed out :(
        self.output.appendPlainText('aborted')

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)

    w = Window()
    w.show()

    sys.exit(app.exec_())