> On 11 Dec 2015, at 2:35 AM, Kamil Koziara <[email protected]> wrote:
> 
> Hi,
> I have problem with settingLimitRequestFieldSize in mod_wsgi-express running 
> python app in docker container (I use Graham's image). I am running  
> Apache/2.4.17 (Unix) mod_wsgi/4.4.21 Python/3.4.3 .
> I tried attaching additional conf file with --include-file custom_apache.conf 
> with bigger limit, but I still get:
> <h1>Bad Request</h1>
> <p>Your browser sent a request that this server could not understand.<br />
> Size of a request header field exceeds server limit.<br />
> What could be the problem? Should I do something else?

Primary culprit would be the size of cookies being sent. The Apache default is:

     #define DEFAULT_LIMIT_REQUEST_FIELDSIZE 8190

Only other header I have seen which can be quite large is authorisation headers 
when using OpenStack services.

The —include-file way of adding a config snippet and setting:

    LimitRequestFieldSize 32768

should override it.

If this is from a browser can you use a browser extension to allow you to look 
at the headers being sent to work out which header is the problem one.

Alternatively go into the browser cookie cache and delete the cookies for that 
site.

What limit were you setting when you attempted to override it?

Graham


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