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+Start a mitmproxy with:
+```
+mitmproxy -m "reverse:https://YOUR_MATTERMOST_DOMAIN" -H '/~a | ! ~a/Access-Control-Expose-Headers/*, Authorization, Content-Length, Token' -H '/~a | ! ~a/Access-Control-Allow-Origin/http://localhost:8000'
+```
+
+Run locally:
+```
+cd /path/to/repo; python -m "http.serve"
+```