1380265 - content encoding error

Status: RESOLVED WORKSFORME

(Core :: Networking: HTTP, defect, P3)

Description

[zjtwkgkz]

Attachment: Screen Shot 2017-07-12 at 02.20.30.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/20100101 Firefox/54.0
Build ID: 20170628075643

Steps to reproduce:

Every time I try to open my Youtube feed page (https://www.youtube.com/feed/subscriptions/).


Actual results:

I get a content encoding error. If I reload the page, then it loads fine.


Expected results:

Page should have loaded. Works fine in Safari.

Comment 1

[Andre Klapper]

Does this also happen after disabling any extensions / add-ons and/or with a fresh user profile?

Comment 2

[zjtwkgkz]

My mistake, it's actually an intermittent problem that I can't trigger reliably. I can try to experiment with extensions, but it will take a long time. How do I create another profile?

Comment 3

[Junior [inactive]]

(In reply to zjtwkgkz from comment #2)
> My mistake, it's actually an intermittent problem that I can't trigger
> reliably. I can try to experiment with extensions, but it will take a long
> time. How do I create another profile?

https://developer.mozilla.org/en-US/Firefox/Multiple_profiles

Comment 4

[zjtwkgkz]

The issue is so unpredictable, that disabling extensions will never isolate the problem. Besides, I am only using extensions that are verified, and "signed" by Firefox.  Surely the browser isn't so fragile.

Comment 5

[Kershaw Chang [:kershaw]]

(In reply to zjtwkgkz from comment #4)
> The issue is so unpredictable, that disabling extensions will never isolate
> the problem. Besides, I am only using extensions that are verified, and
> "signed" by Firefox.  Surely the browser isn't so fragile.

If possible, could you try to capture the HTTP log when this issue happens?
https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/HTTP_logging#Using_aboutnetworking

Thanks.

Comment 6

[zjtwkgkz]

This issue persists and has not been resolved. It's impossible to predict when the error happens, and I don't want to run an HTTP log continuously as it grows by the hundreds of megabytes.

Comment 7

[zjtwkgkz]

I have determined that using the about:networking HTTP log, PREVENTS the issue from materializing. I just got the error now, and I was able to hit the "Try Again" button over and over, but as soon as I turn on logging, the page loads normally.

Comment 8

[Dragana Damjanovic [:dragana]]

do you still see this problem?

Comment 9

[Valentin Gosu [:valentin]]

Please reopen if you are able to find a way to reliably reproduce, or more info about the problem.
When you say "a content encoding error" that prevents the page from loading, could you upload a screenshot of that?
Thanks!

Comment 10

[zjtwkgkz]

I was finally able to capture an http log, but it's huge (29MB of text). What should I look for?
I did upload a screenshot.

Comment 11

[Shian-Yow Wu [:swu]]

(In reply to zjtwkgkz from comment #10)
> I was finally able to capture an http log, but it's huge (29MB of text).

Good you got it! Could you attach the compressed HTTP log?

Comment 12

[zjtwkgkz]

Attachment: firefox http log

Comment 13

[Honza Bambas (:mayhemer)]

(In reply to zjtwkgkz from comment #12)
> Created attachment 8926598 [details]
> firefox http log

Thanks.  On what Firefox version was this exactly captured and what exactly was the symptoms? (sorry to ask probably once again, I just want to be sure I know what to look at).

Comment 14

[Honza Bambas (:mayhemer)]

The log is from version <57, exact version would be good to know.

Looks like the server br encoded response is either broken or we can't handle it:

	Line 5951: 2017-11-08 22:39:49.768997 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 ctor
	Line 5953: 2017-11-08 22:39:49.769007 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 AsyncConvertData br uncompressed mode 3
	Line 5955: 2017-11-08 22:39:49.769038 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 onstart
	Line 5956: 2017-11-08 22:39:49.769048 UTC - [Main Thread]: D/nsHttp nsHttpCompressConv 0x124ee6370 OnDataAvailable 1380
	Line 5960: 2017-11-08 22:39:49.769065 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 brotlihandler decompress 1380
	Line 5977: 2017-11-08 22:39:49.769192 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 brotlihandler decompress rv=2 out=0
	Line 5979: 2017-11-08 22:39:49.769207 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 onstop 0
	Line 5981: 2017-11-08 22:39:49.769214 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 onstop brotlihandler rv 804b001b
	Line 5983: 2017-11-08 22:39:49.769241 UTC - [Main Thread]: D/nsHttp nsHttpCompresssConv 0x124ee6370 dtor


Which is the converter the affected channel is using:
nsHttpChannel @11b173000 created 2017-11-08 22:39:48.520

Comment 15

[zjtwkgkz]

The problem is explained fully (including version) in the original bug report. I have since upgraded to Firefox 56.0.2

Comment 16

[Honza Bambas (:mayhemer)]

I'll try to extract a bit more info from the log.

What are the extension you have installed, just in case?  (When an extension is signed, it doesn't mean there is not a bug in it!).  Thanks.

Comment 17

[zjtwkgkz]

Addons:

Adblock Plus + Element hiding
Always Preview
Safe browsing
Xmarks

Comment 18

[Gary Chen [:xeonchen]]

Honza is working on this, I'll leave the priority field for you.

Comment 19

[Honza Bambas (:mayhemer)]

Not a wide issue -> P3.

Comment 20

[zjtwkgkz]

I don't have this issue any more, and I have no idea what fixed it.

Comment 21

[Honza Bambas (:mayhemer)]

Thanks for the update.  I believe this was a server issue, but now it's hard to figure out.  Sorry I didn't get to it sooner.