675602 - Web console show "Cannot show responses of type «(null)»" for 304 "Not modified" responses

Status: RESOLVED FIXED

(DevTools :: General, defect)

Description

[Artem Skoretskiy]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20100101 Firefox/5.0
Build ID: 20110622232440

Steps to reproduce:

0. Opened Firefox
1. Opened web console
2. Enabled logging of requests/responses
3. Opened site that does 304 responses
4. Clicked on that request in web console
4. Scrolled down to the response content block


Actual results:

See "Cannot show responses of type «(null)»" in response content block


Expected results:

Response content block should show «(null)».

Also it would be great there one more field appear that would show actual value given to browser core (taken from cache).

Comment 1

[George Carstoiu]

Mozilla/5.0 (X11; Linux i686; rv:8.0a1) Gecko/20110802 Firefox/8.0a1

Artem, can you please provide a link to a website that generates 304 responses?

Thanks!

Comment 2

[Artem Skoretskiy]

Sample of the 304 page that produces the same bug is http://feeds.feedburner.com/~ff/couchdb?d=G79ilh31hkQ

Comment 3

[Virgil Dicu [:virgil] [QA]]

Mozilla/5.0 (X11; Linux x86_64; rv:9.0a1) Gecko/20110822 Firefox/9.0a1

The actual result for me is: <<Unable to display responses of type "(null)">> in "unknown content type" tab. 

Taking the last phrase from comment 0 into consideration, Artem, would this rather fit as an enhancement issue?

Comment 4

[Artem Skoretskiy]

(In reply to Virgil Dicu from comment #3)
> Taking the last phrase from comment 0 into consideration, Artem, would this
> rather fit as an enhancement issue?

This is a bug as in the worst case it should show "(null)"  instead of this "Unable to display" message. That might also lead to some mem leak or security hole. Please confirm it as you reproduced that.

As of my comment - there are two ways to show that response and I'm not sure what is more suitable:
 * show response as is (i.e. "(null)")
 * show actual content given to JS (i.e. the previous content)

It would be great if we show both.

Comment 5

[Virgil Dicu [:virgil] [QA]]

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:9.0a1) Gecko/20110829 Firefox/9.0a1
Mozilla/5.0 (X11; Linux i686; rv:9.0a1) Gecko/20110818 Firefox/9.0a1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:9.0a1) Gecko/20110829 Firefox/9.0a1
Mozilla/5.0 (Windows NT 5.1; rv:9.0a1) Gecko/20110829 Firefox/9.0a1

Reproducible on Ubuntu 11.04, Windows XP and 7, Mac X OS 10.6 using the site provided in comment 2.

Steps:

1. Open Firefox
2. Open web console
3. Enable logging of requests/responses (right click web console)
3. Open site that does 304 responses (http://feeds.feedburner.com/~ff/couchdb?d=G79ilh31hkQ)
4. Reload the web page.
5. Click the last request.

Actual result: <<Unable to display responses of type "(null)">> under "unknown content type"

Expected results: Cached image

Last good nightly: 2011-01-11
First bad nightly: 2011-01-12

Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=4413ed6ba5a5&tochange=c0e05d518f57

Comment 6

[Rob Campbell [:rc] (:robcee)]

found this during triage. This appears to be fixed. Closing.