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From Swaminathan Bhaskar <>
Subject Re: Calling another URL from output filter
Date Fri, 16 Mar 2012 01:57:47 GMT
Hi Sorin

Can you share your code for this cae so that I can take a look to get an 
understanding. Can I call a uri on a different server before the proxy 
to the requested server ?


On 03/05/2012 04:26 AM, Sorin Manolache wrote:
> On 2012-03-04 19:19, Swaminathan Bhaskar wrote:
>> Hello,
>> How can I call another url from an output filter - here is the scenario:
>> when a client accesses, this url autheticates 
>> the
>> user and we dont want the response going back to the client rather call
>> another url which will return some data 
>> ... we
>> want to send the data from the second url and response headers from 
>> first
>> url merged back to the client. So my thought is to intercept the 
>> response
>> from the first url in an output ffilter and make a call from the output
>> filter to the second url. What function call would allow me to make 
>> th call
>> to the second url Any help appreciated
> Hello,
> We did something similar but we didn't issue the 2nd request from the 
> output filter of the first.
> The first request was made by the apache subrequest API (the 
> ap_sub_req_lookup_uri and ap_run_sub_req functions). The output filter 
> ran until it encountered an end-of-stream. It did not make any other 
> request. The output filter of the subrequest did not pass any brigade 
> to downstream filters. It simply parsed the response, stored relevant 
> data in some structure and returned APR_SUCCESS to its upstream filters.
> Next, after ap_run_sub_req returned, we invoked the 2nd URL via the 
> proxy module. The useful data returned by the 1st URL was taken from 
> the structure in which the subrequest stored it.
> Calling a 2nd URL from output filters is a bit tricky, as you have 
> filter-chains invoked from within a filter-chain, so we preferred to 
> call the 2nd URL only after the request to the first completed.
> Regards,
> Sorin

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