317157 - favicon.ico not retrieved for url "http://localhost"; succeeds for "http://127.0.0.1"

Status: VERIFIED INCOMPLETE

(Firefox :: General, defect)

Description

[cmatech]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8) Gecko/20051111 Firefox/1.5
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8) Gecko/20051111 Firefox/1.5

On a valid and working (locally hosted) website: when a users enters the url "http://localhost" there is no corresponding request for "http://localhost/favicon.ico"; However if "http://127.0.0.1" or "http://{local machine name}" is requested then favicon.ico *is* requested, returned and displayed (location & tool bar). I can verify this by watching my apache access log and monitoring the GET requests. In *ALL* cases the html content is requested, sent and displayed properly. Curiously, in the access log, apache shows a requesting client IP (IPv6) address of ::1 when "localhost" is used; but IPv4 "127.0.0.1" or the IPv4 address of the resolved local machine (example: 172.16.0.2) when "http://127.0.0.1" or "http://{local machine name}" are used respectively.

Reproducible: Always

Steps to Reproduce:
1. request a valid and functioning locally hosted website that can correctly deliver a valid favicon.ico (image/x-icon) by using url of: http://localhost


Actual Results:  
GET /favicon.ico is not sent by browser.

Expected Results:  
made a GET /favicon.ico request

local system: Mac OS X 10.4.3; 1.2 GHz PowerPC G4; 1 GB Ram
local http server: Apache/2.0.55 (Unix) DAV/2 mod_python/3.1.3 Python/2.4.1

Comment 1

[d]

I know it's old by now, but it shows up for me on Windows Vista. Does the problem still exist on Macs? If not, I think this can be closed?

Comment 2

[Tyler Downer [He/Him]]

No reply, INCOMPLETE. Please report back with the above steps.

Comment 3

[Stephen Waters]

This bug occurs in Firefox 50.1.0 on Linux. Ran into it today while testing locally. 127.0.0.1 grabs the favicon just fine but using localhost does not. In my code, I'm using: 
<link rel="shortcut icon" type="image/png" href="/assets/favicon.ico"/>

Comment 4

[Nishil]

The (In reply to Stephen Waters from comment #3)

You should probably have type="image/x-icon" because you are referring to a .ico file not png.

However I have tested with both file types and the bug still exists. The tab displays the favicon but not the bookmark.

Comment 5

[Nishil]

Confirmed on Linux Mint 18 (Sarah)

Comment 6

[majintrollascended]

this is still happening in version 60.0.1 (64 bit) on windows 7

Comment 7

[olegik.ua]

Still happening in version 64.0