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Re: totally WEIRD bug? Firefox caching?

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Am 20.03.2014 12:26, schrieb The Natural Philosopher:

> On 20/03/14 09:13, Arno Welzel wrote:
>> Am 19.03.2014 18:25, schrieb The Natural Philosopher:
>>
>>> I have TWO IDENTICAL PHP  FILES.
>>>
>>> They are supposed to display an image got from a database.
>>>
>>> One does. The other does not.
>>>
>>> It persistently tells me the image is corrupted.
>>>
>>> I have even copied one file that works directly over the other. It still
>>> doesn't work.
[...]
> What is happning - and oddly running it against a test version of IE6 in 
> my XP VM showed it up, was that it was outputting a '404 file not found' 
> text BEFORE outputting perfectly valid PNG.
> 
> Why this is happening is a bug somewhere else completely.
> 
> IE 6 simply showed the text and the binary gobbledygook which was the 
> clue I needed.

Yes, because IE 6 assumes the user may not understand a server generated
error message and shows its own message as long as the reponse is below
a certain size limit (AFAIR less than 4000 bytes, but i may not remember
correctly). This is even more annoying - sometimes you see the message
from IE itself and sometimes

> How this has happened will take me some time to understand because the 
> line that says '404 not found' is followed  - or I thought it was - by 
> an exit(); statement.
> 
>> Either Firefox once got an invalid image and cached the response or the
>> server does not respond the way you think. Maybe a BOM in the PHP file?
>> This may not be visible in your editor, but it can cause all sort of
>> problems.
>>
>>
> Firefox makes it hard to debug because it DOES cache bad results: I 
> usually fix that by sending random nonsensical GET parameters which are 
> ignored to ensure it thinks its a different URL each time.
> 
> It a huge minus against firefox that it didn't - even using the 
> debugging console - show me what was really going on, whereas IE6 did.

You should learn to read HTTP response headers in the developer console
of Firefox. When I open <http://arnowelzel.de/wiki/en/tools/rwinfo>
there the developer console of Firefox tells me EXACTLY what is going on:

1) The server responded with a status code 404 (not found)

2) The response contains a number of headers which are also displayed




-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de

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totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-19 17:25 +0000
  Re: totally WEIRD bug? Firefox caching? "J.O. Aho" <user@example.net> - 2014-03-19 20:06 +0100
    Re: totally WEIRD bug? Firefox caching? Robert Heller <heller@deepsoft.com> - 2014-03-19 14:32 -0500
      Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-19 23:42 +0000
    Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-19 23:42 +0000
  Re: totally WEIRD bug? Firefox caching? Gabe <usenet@moojuice.net> - 2014-03-19 21:39 +0000
    Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-19 23:43 +0000
      Re: totally WEIRD bug? Firefox caching? Gabe <usenet@moojuice.net> - 2014-03-20 08:29 +0000
  Re: totally WEIRD bug? Firefox caching? Richard Yates <richard@yatesguitar.com> - 2014-03-19 18:34 -0700
    Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-20 03:10 +0000
      Re: totally WEIRD bug? Firefox caching? Richard Yates <richard@yatesguitar.com> - 2014-03-19 21:26 -0700
        Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-20 11:13 +0000
  Re: totally WEIRD bug? Firefox caching? Arno Welzel <usenet@arnowelzel.de> - 2014-03-20 10:13 +0100
    Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-20 11:26 +0000
      Re: totally WEIRD bug? Firefox caching? Jerry Stuckle <jstucklex@attglobal.net> - 2014-03-20 08:43 -0400
      Re: totally WEIRD bug? Firefox caching? Arno Welzel <usenet@arnowelzel.de> - 2014-03-20 15:53 +0100
        Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-20 18:39 +0000
          Re: totally WEIRD bug? Firefox caching? Arno Welzel <usenet@arnowelzel.de> - 2014-03-21 08:33 +0100
          Re: totally WEIRD bug? Firefox caching? Nisse Engström <news.NOSPAM.uvex6@luden.se> - 2014-03-22 07:24 +0100
            Re: totally WEIRD bug? Firefox caching? The Natural Philosopher <tnp@invalid.invalid> - 2014-03-22 12:10 +0000
              Re: totally WEIRD bug? Firefox caching? Robert Heller <heller@deepsoft.com> - 2014-03-22 10:48 -0500
                Re: totally WEIRD bug? Firefox caching? Doug Miller <doug_at_milmac_dot_com@example.com> - 2014-03-22 18:08 +0000

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