Mailing List Archive

[mod_backhand-users] Occaisional, inexplicable 404s on moderator servers
I'm using the close-to-latest CVS snapshot (as of Oct. 2) of mod_backhand on
two moderator servers + five total servers and it's been performing
relatively well. However, I'm continuing to have occaisional, inexplicable,
and seemingly random 404 errors about 1 out of every 15 page views. This is
particular strange for the following reasons:
* There's no consistency in terms of time of day, URI, or client. It happens
on a broad range of all three criteria.
* It's occuring on URI's that obviously exist (like on the root URL "/").
* The virtual host is set so that non-existant URI's automatically 302
redirect to an error page, NOT 404.

I suspect that it might be related to mod_backhand because the problem seems
to have begun occuring around the same time as our backhand installation.
Also, the error log on the moderator server shows this when a 404 occurs:

[Tue Nov 13 01:15:30 2001] [error] [client xxx.xxx.xxx.xxx] File does not
exist: backhand:/index.php

Note that this is different than the usual "bad URI"-type error log entry
because it has the "backhand:" prefix before the URI. Here's an example of a
standard "bad URI"-type error log entry:

[Tue Nov 13 18:28:32 2001] [error] [client xxx.xxx.xxx.xxx] File does not
exist: PATH_TO_SITE_DOCS/testuri.html

Any ideas? Thanks in advance!
[mod_backhand-users] Occaisional, inexplicable 404s on moderator servers [ In reply to ]
On Tuesday, November 13, 2001, at 09:35 PM, Stephen Wang wrote:
> I'm using the close-to-latest CVS snapshot (as of Oct. 2) of
> mod_backhand on
> two moderator servers + five total servers and it's been performing
> relatively well. However, I'm continuing to have occaisional,
> inexplicable,
> and seemingly random 404 errors about 1 out of every 15 page views.
> This is
>
> < ... snip ... >
>
> Any ideas? Thanks in advance!

Though I don't believe that the above errors are causing the problem,
you should update to the latest CVS version, because there is a fix for
that bug. It caused real problem is you had a URL like:
http://mysite/root/index.html. The but would cause Apache to check
/root/index.html and as /root/ typically exists and is not
readble/executable by all (on Linux) it would pop back an "forbidden".

This could be what you are experiencing.

Let me know if that fixes the problem.

--
Theo Schlossnagle
1024D/82844984/95FD 30F1 489E 4613 F22E 491A 7E88 364C 8284 4984
2047R/33131B65/71 F7 95 64 49 76 5D BA 3D 90 B9 9F BE 27 24 E7
[mod_backhand-users] Occaisional, inexplicable 404s on moderator servers [ In reply to ]
Steve,

Did you get this error resolved yet? Are you using connection pooling
or do you have that disabled? It is it currently enabled (default), try
disabling it and see if your error goes away.

On Tuesday, November 13, 2001, at 09:35 PM, Stephen Wang wrote:

> I'm using the close-to-latest CVS snapshot (as of Oct. 2) of
> mod_backhand on
> two moderator servers + five total servers and it's been performing
> relatively well. However, I'm continuing to have occaisional,
> inexplicable,
> and seemingly random 404 errors about 1 out of every 15 page views.
> This is
> particular strange for the following reasons:
> * There's no consistency in terms of time of day, URI, or client. It
> happens
> on a broad range of all three criteria.
> * It's occuring on URI's that obviously exist (like on the root
> URL "/").
> * The virtual host is set so that non-existant URI's automatically 302
> redirect to an error page, NOT 404.

--
Theo Schlossnagle
1024D/82844984/95FD 30F1 489E 4613 F22E 491A 7E88 364C 8284 4984
2047R/33131B65/71 F7 95 64 49 76 5D BA 3D 90 B9 9F BE 27 24 E7