1381144 - Proxy bypassed for 127.0.0.1 and [::1] adresses when "No Proxy for" field is not empty

Status: RESOLVED INVALID

(Core :: Networking: HTTP, defect)

Description

[Elouan Martinet]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.9) Gecko/20100101 Goanna/3.2 Firefox/45.9 PaleMoon/27.4.0
Build ID: 20170714081555

Steps to reproduce:

Set the "No Proxy for" field to anything, not empty (not spaces), that should not affect 127.0.0.1 or [::1], such as "foo" or "example.org, example.com".
Tested in release (54) and nightly (56, revision 67cd1ee26f26).


Actual results:

For both 127.0.0.1 and [::1] addresses (all ports), but not localhost, Firefox bypasses the proxy like if these addresses would be added in the "No Proxy for" field.
It's not the case if that field is empty.
All proxy types seem to be affected (you can check without proxy and http server, you'll get "The proxy server is refusing connections" or "Unable to connect").


Expected results:

Both 127.0.0.1 and [::1] addresses should not be implied in the "No Proxy for" field when it is not empty.

Comment 1

[Amy Chung [:Amy]]

Hi Elouan,
Would you make http log and attach this file on this bug.
https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/HTTP_logging
Thanks!

Comment 2

[Kershaw Chang [:kershaw]]

I'd like to put this on Gary's radar.

Comment 3

[Gary Chen [:xeonchen]]

I'd say this is a feature rather than a bug.

Comment 4

[Elouan Martinet]

How is this a feature? I didn't enter 127.0.0.1 and ::1 in the field. Neither localhost.

Comment 5

[Gary Chen [:xeonchen]]

(In reply to Elouan Martinet from comment #4)
> How is this a feature? I didn't enter 127.0.0.1 and ::1 in the field.
> Neither localhost.

We had a discussion in [1] and we actually don't proxy for localhost/127.0.0.1.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1028195#c14