400 bad request errors - Firefox and Chrome

Maxim Dounin mdounin at mdounin.ru
Tue Sep 6 18:12:58 UTC 2011


On Tue, Sep 06, 2011 at 01:49:02PM -0400, aries wrote:

> Hello.
> The access.log, have multiples lines similar to:
>  [06/Sep/2011:11:05:32 +0500] "-" 400 0 "-" "-" "-"
> These are only created when browsing with Firefox or Chrome, do not
> register these errors if you use IExplorer.
> The error only shows in access.log, the page loads properly without
> showing any error.
> I think that it is not a problem of cookies because these errors are
> logged even if disabling the use of cookies on your browser.
> "error_log /var/log/nginx/error.log info;" not show me any data about
> this error.
> I noticed that error is recorded between 3 to 7 seconds after that the
> apache access.log recorded the entry with 200 code for this visit.

With Chrome it's caused by Chrome's behaviour: it opens 2 
connections to requested host, and may close one of them without 
sending any single request though it (if one connection was 
enough).  There is no real problem here, just a sign that 
connection was opened but not used.

No idea about Firefox, but likely it does something similar.

Maxim Dounin

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