misc: add a REQUESTS_PROXIES settings for requests calls (#20371)

wcs/qommon/misc.py

@@ -35,6 +35,7 @@ try:
 except ImportError:
     Image = None
 
+from django.conf import settings
 from django.utils import datetime_safe
 
 from quixote import get_publisher, get_response, get_request
@@ -289,7 +290,7 @@ def _http_request(url, method='GET', body=None, headers={}, cert_file=None, time
 
     try:
         response = requests.request(method, url, headers=headers, data=body,
-                timeout=timeout, cert=cert_file)
+                timeout=timeout, cert=cert_file, proxies=settings.REQUESTS_PROXIES)
     except requests.Timeout:
         raise ConnectionError('connection timed out while fetching the page')
     except requests.RequestException as err:

wcs/settings.py

@@ -146,6 +146,10 @@ CACHES = {
 
 WCS_LEGACY_CONFIG_FILE = None
 
+# proxies=REQUESTS_PROXIES is used in python-requests call
+# http://docs.python-requests.org/en/master/user/advanced/?highlight=proxy#proxies
+REQUESTS_PROXIES = None
+
 local_settings_file = os.environ.get('WCS_SETTINGS_FILE',
         os.path.join(os.path.dirname(__file__), 'local_settings.py'))
 if os.path.exists(local_settings_file):