Respect no_proxy environment variable#2171
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An explicitly configured proxy was used for every request, even when the target host matched the no_proxy / NO_PROXY environment variable. Add a _proxies_for_url helper that returns an empty proxy mapping for bypassed hosts so libcloud behaves consistently with other HTTP clients.
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Respect no_proxy environment variable
Description
Fixes #2077.
When a proxy is configured explicitly (via
set_http_proxy()or thehttp_proxy/https_proxyenvironment variables), libcloud used it for every request, includinghosts listed in
no_proxy/NO_PROXY. Other HTTP clients (curl, requests via itsown env handling, urllib) all honour
no_proxy, so this was surprising and made itimpossible to talk to an internal endpoint directly while a proxy was configured.
This adds a
_proxies_for_url(url)helper onLibcloudBaseConnectionthat returnsan empty proxy mapping (
{}) when the target host matchesno_proxy, andNoneotherwise so the session default applies. It is passed as
proxies=inLibcloudConnection.request(). Matching is delegated torequests.utils.should_bypass_proxies,so libcloud inherits the exact same
no_proxysemantics as requests rather thanreimplementing them.
Status
done, ready for review
Checklist (tick everything that applies)