try https

django_code/stash_management/apps.py

@@ -15,7 +15,11 @@ import yaml
 from urllib import request as urlrequest
 
 proxy_host = "gluetun-svc.gluetun.svc:8888"
-
+proxy_url = 'http://gluetun-svc.gluetun.svc:8888'
+proxy = urlrequest.ProxyHandler({
+    'http': proxy_url,
+    'https': proxy_url  # Add the handler for HTTPS
+})
 
 def hello(request):
     return HttpResponse('<h1>Hello stash!</h1>')
@@ -73,7 +77,7 @@ def increment_and_download(minimum_increment,maximum_increment,url,url_suffix,st
         elif len(str(increment)) == 1:
             increment_generated ='000' + str(increment)
 
-        proxy = urlrequest.ProxyHandler({'http': 'http://gluetun-svc.gluetun.svc:8888'})
+        proxy = urlrequest.ProxyHandler({'https': 'http://gluetun-svc.gluetun.svc:8888'})
         opener = urlrequest.build_opener(proxy)
         urlrequest.install_opener(opener)
         urlrequest.urlretrieve(url+increment_generated+url_suffix, stash_folder+"/"+increment_generated+url_suffix)