[users@httpd] Input filters that alter content-length

[Ivan Prostran <iv...@bulb.hr>]

Hi,

I have the following scenario :

- Apache/2.2.19 (Solaris 10 SPARC)

      SetInputFilter alterxmlbody (AP_FTYPE_RESOURCE)
      SetHandler weblogic-handler


The handler forwards requests to multiple weblogic servers
and the filter itself analyzes and/or changes the POST data
in a way that the length of the incoming request may be changed.

The question is :

What is the proper and legitimate way to deal with this situation?

Should the input filter set the new CL value in "headers_in" before
returning from the callback, or just remove it from the list?


apr_off_t length;
apr_brigade_length     (bb,1,&length);
apr_table_setn(f->r->headers_in, "Content-Length", 
apr_off_t_toa(f->r->pool, length));

Unfortunately, this approach breaks the pipeline because sometimes
the filter needs to buffer data over more than one call.

or

apr_table_unset(f->r->headers_in, "Content-Length");


Best regards
Ivan

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