fix: deprecated urllib calls (#655)

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## 1.43.0 [unreleased]
 
+### Bug Fixes
+1. [#655](https://github.com/influxdata/influxdb-client-python/pull/655): Replace deprecated `urllib` calls `HTTPResponse.getheaders()` and `HTTPResponse.getheader()`.
+
 ## 1.42.0 [2024-04-17]
 
 ### Bug Fixes

influxdb_client/client/exceptions.py

@@ -15,7 +15,10 @@ def __init__(self, response: HTTPResponse = None, message: str = None):
         if response is not None:
             self.response = response
             self.message = self._get_message(response)
-            self.retry_after = response.getheader('Retry-After')
+            if isinstance(response, HTTPResponse):  # response is HTTPResponse
+                self.retry_after = response.headers.get('Retry-After')
+            else:  # response is RESTResponse
+                self.retry_after = response.getheader('Retry-After')
         else:
             self.response = None
             self.message = message or 'no response'

influxdb_client/rest.py

@@ -13,7 +13,7 @@
 
 import logging
 from typing import Dict
-
+from urllib3 import HTTPResponse
 from influxdb_client.client.exceptions import InfluxDBError
 from influxdb_client.configuration import Configuration
 
@@ -34,7 +34,10 @@ def __init__(self, status=None, reason=None, http_resp=None):
             self.status = http_resp.status
             self.reason = http_resp.reason
             self.body = http_resp.data
-            self.headers = http_resp.getheaders()
+            if isinstance(http_resp, HTTPResponse):  # response is HTTPResponse
+                self.headers = http_resp.headers
+            else:  # response is RESTResponse
+                self.headers = http_resp.getheaders()
         else:
             self.status = status
             self.reason = reason