使用QWebEnginePage时的奇数JS错误

Question

因此，我一直在开发一个使用PyQt6-WebEngine进行身份验证的系统，该系统可以在javascript重定向之后发出web请求，因为Python中的请求不支持这一点。我制作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()

这方面的问题是，它一直在输出中给我JS错误，它突然开始执行，而且没有明显的原因。对于Google.com，它给出了1-2个错误，比如：js: Error with Permissions-Policy header: Unrecognized feature: 'ch-ua-full-version-list'.和其他网站，它已经把我交给了30+。

除了混乱之外，这本身不会那么烦人，但我还有另一个问题(我不太确定这是这个脚本的错误，但它几乎与JS错误问题相同)，在这个问题上，所请求的网站根本不会返回任何html。

有什么想法吗？

Answer 1

我最终解决了这个问题: JS错误与请求失败无关。我刚刚发出了无效的请求(标题问题等等)。我仍然不知道为什么这些错误似乎是随机出现的，也许我只是错误地得出了这个结论。