HTTP Request function with retry for IronPython

IronPythonHttpRequest.py

from System.Net import WebRequest
from System.Text import ASCIIEncoding
from System.IO import StreamReader
from System.Net import ServicePointManager
from System.Net import SecurityProtocolType
from System.Net import WebException
import time

def http(method, url, data_string=None, header={}, retry=3):
    ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12
    request = WebRequest.Create(url)
    request.UseDefaultCredentials = True
    request.Method = method
    request.ContentLength = 0
    request.Headers.Add('Access-Control-Allow-Origin', '*')
    
    for k,v in header.items():
        request.Headers.Add(k,v)
    
    if data_string:
        request.ContentType = "application/json"
        encoding = ASCIIEncoding()
        data = encoding.GetBytes(data_string)
        request.ContentLength = data.Length
        stream = request.GetRequestStream()
        stream.Write(data, 0, data.Length)
        stream.Close()

    try:
        response = request.GetResponse()
        print (response.StatusDescription)
        dataStream = response.GetResponseStream()
        reader = StreamReader(dataStream)
    
        responseFromServer = reader.ReadToEnd()
            
        reader.Close()
        dataStream.Close()
        response.Close()
        return responseFromServer

    except WebException as e : 
        if e.Response.StatusDescription == "Not Found" and retry>0:
            time.sleep(10)
            return http(method, url, data_string, header, retry-1)

        print (e.Response.StatusDescription)
        dataStream = e.Response.GetResponseStream()
        reader = StreamReader(dataStream)
    
        responseFromServer = reader.ReadToEnd()
        print (responseFromServer)
    
        reader.Close()
        dataStream.Close()