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When programming a QGis plugin, I would like to POST a .json-file to a remote server; preferably using QgsNetworkContentFetcher to do this on the background while waiting for a response.

However, I can't seem to figure out how to configure this as a POST request.

My current code is something like:

def fetch_non_blocking(url, callback, onerror, postData=None):
    fetcher = QgsNetworkContentFetcher()
    def onFinished():
        callback(fetcher.contentAsString())
    
    fetcher.finished.connect(onFinished)
    request = QNetworkRequest(QUrl(url))
    request.setRawHeader("User-Agent","anyways.eu QGIS-plugin")
    request.setRawHeader("Content-Type", "application/json")
    fetcher.fetchContent(request)

which works fine for GET-request, but not a POST

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