added merge environmental settings to prepared request

Author: Gabefire

libs/labelbox/src/labelbox/client.py

@@ -214,15 +214,20 @@ def convert_value(value):
             if files:
                 del headers['Content-Type']
                 del headers['Accept']
+            
             request = requests.Request('POST',
                                        endpoint,
                                        headers=headers,
                                        data=data,
                                        files=files if files else None)
 
-            prepped: requests.PreparedRequest = request.prepare()
-
-            response = self._connection.send(prepped, timeout=timeout)
+            prepped: requests.PreparedRequest = self._connection.prepare_request(
+                request
+            )
+            
+            settings = self._connection.merge_environment_settings(prepped.url, {}, None, None, None)
+            
+            response = self._connection.send(prepped, timeout=timeout, **settings)
             logger.debug("Response: %s", response.text)
         except requests.exceptions.Timeout as e:
             raise labelbox.exceptions.TimeoutError(str(e))