[QGIS-Developer] MultiPart post network request stopped working in master

[Raymond Nijssen]

Dear all,

One of my plugins stopped working in QGIS master, because some of the 
requests seem invalid. I spent quite some time on debugging but cannot 
find the problem.

This script runs in 3.22.3 but not ion 3.23. It uploads an xml file to a 
validation service. It should print: {'successful': True, 'errors': [], 
'warnings': []}

Anyone a clue? I'm feeling that the best way would be using the 
QgsBlockingNetworkRequest post() function but that does not seem to work 
with a QHttpMultiPart variable.

Thanks!
Raymond



import json

manager = QgsNetworkAccessManager.instance()

url = QUrl('https://connect.aerius.nl/api/v7/utility/validate')

request = QNetworkRequest(url)

multi_part = QHttpMultiPart(QHttpMultiPart.FormDataType)

file_parts = []
gml_fn = 
'/home/raymond/terglobo/projecten/aerius/202007_calc_input_plugin/demodata/test_20220121/test_kort.gml'

file_parts.append({'name': 'filePart', 'file_name': gml_fn, 'file_type': 
'application/gml+xml'})

for fp in file_parts:
     file = QFile(fp['file_name'])
     file_part = QHttpPart()
     file_part.setHeader(QNetworkRequest.ContentTypeHeader, 
QVariant(fp['file_type']))
     name = fp['name']
     file_part.setHeader(QNetworkRequest.ContentDispositionHeader,
         QVariant(f'form-data; name="{name}"; 
filename="{QFileInfo(file).fileName()}"'))
     file.open(QIODevice.ReadOnly)
     file_part.setBodyDevice(file)
     file.setParent(multi_part)
     multi_part.append(file_part)

# This line already fires an invalid request in qgis 3.23:
reply = manager.post(request, multi_part)


# In qgis 3.22 the request is ok. The rest of the code will wait for the 
json
# reply and display it.


# make request blocking
loop = QEventLoop()
reply.finished.connect(loop.quit)
loop.exec_()


bstr = reply.readAll()
result_dict = json.loads(bytes(bstr))
print(result_dict)





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