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From Veiko Kukk <veiko.k...@gmail.com>
Subject Re: Cache HIT/MISS header
Date Thu, 14 Dec 2017 11:03:34 GMT
Hi Benjamin,

I used the source as documentation
https://github.com/apache/trafficserver/blob/master/cmd/traffic_via/traffic_via.cc

Veiko


2017-12-13 19:33 GMT+02:00 Benjamin Morel <benjamin.morel@gmail.com>:

> Thank you all for your replies. TBH I expected it to be much simpler!
>
> That being said, proxy.config.http.insert_request_via_str, and parsing
> the resulting Via header, looks like the way to go.
>
> Apart from the obscure decoder, is there a documentation for the format of
> the Via transaction codes?
> With a listing of all possible statuses (cR = fresh Ram hit, cH = fresh
> hit, ...)
>
> I couldn't find this in the doc.
>
> Thanks in advance,
> Ben
>
> On 13 December 2017 at 10:43, Veiko Kukk <veiko.kukk@gmail.com> wrote:
>
>> 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-c
>>>> onfig-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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