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From Sorin Manolache <>
Subject Re: output filter needs to redirect to 503 error status
Date Thu, 16 Oct 2014 16:58:48 GMT
On 2014-10-16 15:36, Eric Johanson wrote:
> Hi,
> I have an output filter module which is working just fine, but I need to add
> a feature so that when certain error conditions occur during processing, the
> output filter hook function redirects the whole request to a 503 error
> status (service unavailable).  Obviously for a "handler" module this is
> trivial to accomplish, but it is not clear how to do this in an output
> filter module.
> My output filter hooked function is defined as follows:
>         apr_status_t mts_out_filter(ap_filter_t *f,apr_bucket_brigade *bb)
> I need this function to "do something" that causes the whole request to be
> redirected such that the client sees a 503 error status with no
> body/content.
> Things that I've tried so far:
> * Returning HTTP_SERVICE_UNAVAILABLE from the output filter function after
> calling "ap_pass_brigade(f->next,bb)"
> * Setting f->r->status to HTTP_SERVICE_UNAVAILABLE after calling
> "ap_pass_brigade(f->next,bb)"

Try setting f->r->status _before_ calling ap_pass_brigade.

If you get the 503 but you get the default 503 error response body that 
is automatically set by apache then replace it by using the 
ErrorDocument directive (or


> * calling "ap_send_error_response(f->r,HTTP_SERVICE_UNAVAILABLE)"
> None of these really seem to behave properly.  I just want the client to
> receive a 503 error status with no content body.  There must be a way to
> achieve this behavior from within an output filter hook?
> Any advice is appreciated.
> Thanks, -Eric

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