Why the error occured when i tried to send a POST request with QWebEngineHttpRequest (PyQt5)? - python-3.x

Question

I try to get JSON Object from source, but getting only errors.
Now I'm trying to understand what I'm doing wrong.
This code works well with other resources.
Maybe It`s not problem with code, but with web-source.
import sys
import json
from PyQt5.QtCore import QByteArray, QUrl
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineCore import QWebEngineHttpRequest
from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineSettings
from pprint import pprint
def on_load_finished():
"""Handle response"""
engine.toPlainText(handle_to_html) # get json
def handle_to_html(html):
"""Handle html"""
print(html)
QApplication.quit()
if __name__ == "__main__":
app = QApplication(sys.argv)
engine = QWebEnginePage()
url = "https://sportsapi.betway.com/api/Events/V2/GetEvents"
request = QWebEngineHttpRequest(url=QUrl(url), method=QWebEngineHttpRequest.Post)
request.setHeader(QByteArray(b"Content-Type"), QByteArray(b"application/json"))
payload = {
"LanguageId": 1,
"ClientTypeId": 2,
"BrandId": 3,
"JurisdictionId": 1,
"ClientIntegratorId": 1,
"ExternalIds": [9032262, 9038528, 9037778],
"MarketCName": "win-draw-win",
"ScoreboardRequest": {"ScoreboardType": 3, "IncidentRequest": {}},
"BrowserId": 3,
"OsId": 3,
"ApplicationVersion": "",
"BrowserVersion": "97.0.4692.99",
"OsVersion": "NT 10.0",
"SessionId": "null",
"TerritoryId": 227,
"CorrelationId": "06779075-21e2-4ba8-8e91-d71a981621fe",
"VisitId": "d1088cdf-13a8-42d0-be90-b34fd1332c36",
"ViewName": "sports",
"JourneyId": "833a4c0c-3354-499f-9d52-949df6d159f9",
}
request.setPostData(bytes(json.dumps(payload), "utf-8"))
engine.load(request)
engine.loadFinished.connect(on_load_finished)
app.exec_()
Errors are looks like
This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Error>
<Message>An error has occurred.</Message>
</Error>
Maybe It`s not problem with code, but with web-source.