使用 QWebEnginePage 时出现奇怪的 JS 错误

Question

所以我一直在使用 PyQt6-WebEngine 开发一个身份验证系统来发出将遵循 javascript 重定向的 Web 请求，因为 Python 中的请求不支持它。我做了一个简单的请求脚本：

import sys
import json

# import PyQt6
import PyQt6
from PyQt6.QtCore import QUrl, QByteArray
from PyQt6.QtWidgets import QApplication
from PyQt6.QtWebEngineCore import QWebEnginePage, QWebEngineHttpRequest


class __Page__(QWebEnginePage):
    def __init__(self, app, url=None, method=None, headers=None, data=None) -> None:
        # Initiate the application
        self.app = app
        super().__init__()

        # Make sure the necessary variables aren't empty
        if url == None:
            raise ValueError("Passed url variable cannot be empty")
        if method == None:
            raise ValueError("Passed method variable cannot be empty")

        # Creates the main request variable
        self.req = QWebEngineHttpRequest()

        # Assign the variables used to setup the request later in self.setupRequest()
        self.method = method
        self.qurl = url
        self.headers = headers

        # Only assign this if the method is post
        if self.method == "post":
            self.postData = data
        else:
            self.postData = None

        # Setup the request
        self.setupRequest()

        # Create a new html variable and stuff, then load the request and launch the app
        self.html = ""
        self.loadFinished.connect(self.finish)
        self.load(self.req)
        self.app.exec()

    def setupRequest(self):

        # Assign the method variable
        if self.method == "get":
            method = QWebEngineHttpRequest.Method.Get
        elif self.method == "post":
            method = QWebEngineHttpRequest.Method.Post
        else:
            raise ValueError(
                "Expected 'get' or 'post' methods, but received '{}'".format(
                    self.method
                )
            )

        # Assign the method variable to the request method
        self.req.setMethod(method)
        self.req.setUrl(QUrl(self.qurl))

        # Assign the headers
        if self.headers != None:
            for i in self.headers:
                self.req.setHeader(
                    QByteArray(list(i.keys())[0].encode("ascii")),
                    QByteArray(list(i.values())[0].encode("ascii")),
                )

        # Assign the postData if the method is post
        if self.method == "post":
            self.req.setPostData(bytes(self.postData, "utf-8"))

    # This part is a bit over my head
    def finish(self):
        self.html = self.toHtml(self.callHtml)
        self.url = self.url()
        self.deleteLater()
        self.app.quit()

    def callHtml(self, html_str):
        self.html = html_str


class app:
    def __init__(self) -> None:
        self.app = QApplication(sys.argv)

    def requestPage(self, url=None, method=None, headers=None, data=None):
        page = __Page__(
            app=self.app, url=url, method=method, headers=headers, data=data
        )
        return page


def main():
    webapp = app()
    request = webapp.requestPage(url="https://google.com", method="get")


if __name__ == "__main__":
    main()

这个问题是它一直在输出中给我 JS 错误，它突然开始出现并且没有明显的原因。使用 Google.com 它给出 1-2 个错误，例如： js: Error with Permissions-Policy header: Unrecognized feature: 'ch-ua-full-version-list'. 对于其他网站，它给了我 30+。

除了混乱之外，这本身并没有那么烦人，但我遇到了另一个问题（我不太确定是这个脚本的错，但它与JS 错误问题）请求的网站根本不会 return 任何 html。

有什么想法吗？

Answer 1

我终于解决了这个问题：JS错误与请求失败无关。我刚刚提出了无效请求（header 问题和问题）。我仍然不确定为什么错误似乎随机弹出，也许我只是错误地得出了这个结论。

使用 QWebEnginePage 时出现奇怪的 JS 错误

Odd JS Errors when using QWebEnginePage

python

qtwebengine

pyqt6