I have the following code where a POST request is sent to a http server with a JSON request body. The debug prints out 2 requests, showing that the request body is sent as a separate request.
import http.client
import json
if __name__ == "__main__":
connexion = http.client.HTTPConnection('localhost',27015)
headers = {'Content-type': 'application/json','Accept': 'application/json'}
dataSent = {'coup': 'e2e4'}
json_dataSent = json.dumps(dataSent)
connexion.set_debuglevel(1)
connexion.request('POST','/faireCoup',json_dataSent,headers)
reponse = connexion.getresponse()
print(reponse.read().decode())
connexion.close()