[squid-users] Question about c-icap and setting X-Next-Services header to empty string

Giray Simsek giray_simsek at hotmail.com
Wed Dec 2 08:56:09 UTC 2015

Thanks Alex. You're right. UsingĀ 

ci_icap_add_xheader(req, "X-Next-Services: ");

instead solved the problem.


> Subject: Re: [squid-users] Question about c-icap and setting X-Next-Services header to empty string
> To: squid-users at lists.squid-cache.org
> From: rousskov at measurement-factory.com
> CC: giray_simsek at hotmail.com
> Date: Tue, 1 Dec 2015 09:18:07 -0700
> On 12/01/2015 08:58 AM, Giray Simsek wrote:
>> I am trying to update the adaptation plan dynamically in the first
>> service (service_a_resp) Basically, if a certain condition is met,
>> then I don't want the second service (service_b_resp) to be called by
>> Squid.
>> icap_enable on
>> icap_send_client_ip on
>> icap_send_client_username on
>> icap_client_username_header X-Client-Username
>> icap_service service_a_resp respmod_precache bypass=on routing=on icap://
>> icap_service service_b_resp respmod_precache bypass=on routing=on icap://
> This is probably not important, but only the first service needs
> routing=on. Your other ICAP service does not route requests.
>> adaptation_service_chain response_chain service_a_resp service_b_resp
>> adaptation_access response_chain allow all
> OK.
>> After reading the documentation about the icap_service option and its
>> routing parameter, I got the impression that I can achieve this by
>> setting X-Next-Services header to empty string in my first service
>> (service_a_resp) in the adaptation chain
> That sounds correct although you are omitting a critical detail:
> X-Next-Services is an ICAP response header, not an HTTP header.
> Naturally, ICAP routing does not modify the HTTP message being routed.
>> as below:
>> ci_headers_add(req->response_header, "X-Next-Services: ");
> Googling suggests that the above c-icap method is for adding HTTP
> headers. You need to add an ICAP response header instead. I do not know
> c-icap API, so I cannot recommend a specific method. If you do not know
> how to do that either, consider asking on c-icap support forums.
> HTH,
> Alex.

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