Use the Qubes update proxy for all HTTP requests when running in a TemplateVM

Author: ArrayBolt3

usr/lib/python3/dist-packages/browser_choice/browser_choice_present.py

@@ -12,6 +12,7 @@
 ## NOTE: This file must not be named 'browser_choice.py', it confuses mypy.
 ## See https://github.com/python/mypy/issues/19410
 
+import os
 import sys
 import traceback
 import subprocess
@@ -277,6 +278,15 @@ def __init__(self, parent: QWidget | None = None):
 
         if GlobalData.qube_type == "templatevm":
             self.is_network_connected: bool = True
+            os.environ["https_proxy"]="http://127.0.0.1:8082/"
+            os.environ["http_proxy"]="http://127.0.0.1:8082/"
+            os.environ["HTTPS_PROXY"]="http://127.0.0.1:8082/"
+            ## Not setting HTTP_PROXY, as applications generally ignore it for
+            ## security reasons. See:
+            ##
+            ## https://superuser.com/questions/876100/https-proxy-vs-https-proxy
+            ## https://github.com/golang/go/issues/16405
+            ## https://httpoxy.org/
         else:
             self.is_network_connected = (
                 subprocess.run(