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From Veiko Kukk <veiko.k...@gmail.com>
Subject Re: Cache HIT/MISS header
Date Wed, 13 Dec 2017 09:43:26 GMT
If you also need MISS (our setup does not, we know amount of requests and
amount of HIT's), you need to add another condition with set-header X-Cache
"MISS"

-- 
Veiko


2017-12-12 14:10 GMT+02:00 Veiko Kukk <veiko.kukk@gmail.com>:

> Hi,
>
> I recently had exact same task: to include cache status in response
> headers. That's what I did:
>
> * proxy.config.http.insert_response_via_str 2
> * Using header_rewrite plugin to create additional header with following
> config:
> cond %{SEND_RESPONSE_HDR_HOOK} [AND]
> cond %{HEADER:Via} /(\[cH|\[cR)/
> set-header X-Cache "HIT"
>
> Veiko
>
>
> 2017-12-12 2:29 GMT+02:00 Igor Cicimov <igorc@encompasscorporation.com>:
>
>> You can use the Via header:
>>
>> ############################################################
>> ##################
>> # Via: headers. Docs:
>> #     https://docs.trafficserver.apache.org/records.config#proxy-
>> config-http-insert-response-via-str
>> ############################################################
>> ##################
>> CONFIG proxy.config.http.insert_request_via_str INT 1
>> CONFIG proxy.config.http.insert_response_via_str INT 3
>> CONFIG proxy.config.http.response_via_str STRING ATS
>>
>> that will insert values like below that you can decode:
>>
>> # traffic_via  '[cHs f ]'
>> Via header is [cHs f ], Length is 8
>> Via Header Details:
>> *Result of Traffic Server cache lookup for URL          :in cache, fresh
>> (a cache "HIT")*
>> Response information received from origin server       :no server
>> connection needed
>> Result of document write-to-cache:                     :no cache write
>> performed
>>
>> for detailed stats (insert_response_via_str INT 3):
>>
>> # traffic_via 'uScHs f p eN:t cCHi p s '
>> Via header is uScHs f p eN:t cCHi p s , Length is 24
>> Via Header Details:
>> Request headers received from client                   :simple request
>> (not conditional)
>> *Result of Traffic Server cache lookup for URL          :in cache, fresh
>> (a cache "HIT")*
>> Response information received from origin server       :no server
>> connection needed
>> Result of document write-to-cache:                     :no cache write
>> performed
>> Proxy operation result                                 :unknown
>> Error codes (if any)                                   :no error
>> Tunnel info                                            :no tunneling
>> Cache Type                                             :cache
>> *Cache Lookup Result                                    :cache hit*
>> ICP status                                             :no icp
>> Parent proxy connection status                         :no parent proxy
>> or unknown
>> Origin server connection status                        :no server
>> connection needed
>>
>> but you might be already familiar with it and not exactly what you need.
>>
>>
>> On Tue, Dec 12, 2017 at 11:11 AM, Miles Libbey <mlibbey@apache.org>
>> wrote:
>>
>>> Perhaps use the X-Debug header:
>>> https://docs.trafficserver.apache.org/en/7.1.x/admin-guide/p
>>> lugins/xdebug.en.html
>>> and maybe a global header_rewrite rule to add the magic header to make
>>> the debug part appear?
>>>
>>> On Mon, Dec 11, 2017 at 8:57 AM, Benjamin Morel
>>> <benjamin.morel@gmail.com> wrote:
>>> > Sorry if this has been asked before, but I couldn't find it in the
>>> docs.
>>> >
>>> > I'm using ATS as a forward proxy. Is there a way to add a response
>>> header to
>>> > tell me if the request was a HIT or a MISS?
>>> >
>>> > Something like: X-Cache: HIT
>>> >
>>> > Thanks in advance,
>>> > Benjamin
>>>
>>
>>
>>
>

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