Proxy response after hooks in ATS

[supraja sridhar]

Hi,

Is there a way to look at the response after it is subjected to hooks in
ATS? I am running trafficserver in foreground with the -Thttp tag and I can
see OS request, Proxy request, Proxy request after hooks for requests but
only OS response and Proxy response for response. I have a plugin similar
to blacklist-0 and would like to if the response transform has taken place.

Thanks,
Supraja

[Alan Carroll]

Proxy response should be after most hooks, i.e. what is sent back to the
user agent. If you really want to be sure, I'd use wireshark. If you are
doing a transform, you will generally need wireshark to see the transformed
content.

Post by supraja sridhar
Hi,
Is there a way to look at the response after it is subjected to hooks in
ATS? I am running trafficserver in foreground with the -Thttp tag and I can
see OS request, Proxy request, Proxy request after hooks for requests but
only OS response and Proxy response for response. I have a plugin similar
to blacklist-0 and would like to if the response transform has taken place.
Thanks,
Supraja

[supraja sridhar]

Thank you ! From the logs it looks like the proxy response is dumped before
callback to the plugin.

Logs:
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpSM.cc:1474
(state_api_callout)> (http) [79] calling plugin on hook
*TS_HTTP_READ_REQUEST_HDR_HOOK
*at hook 0x55af01a68fc0
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpSM.cc:1358
(state_api_callback)> (http) [79] [&HttpSM::state_api_callback,
HTTP_API_ERROR]
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpSM.cc:1398
(state_api_callout)> (http) [79] [&HttpSM::state_api_callout,
HTTP_API_ERROR]
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpTransact.cc:1439
(HandleApiErrorJump)> (http_trans) [79] [HttpTransact::HandleApiErrorJump]
+++++++++ Proxy's Response 2 +++++++++
-- State Machine Id: 79
HTTP/1.1 500 INKApi Error^M
Date: Wed, 28 Feb 2018 12:16:24 GMT^M
Connection: close^M
^M
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpTransact.cc:1472
(HandleApiErrorJump)> (http_trans) Next action
SM_ACTION_INTERNAL_CACHE_NOOP; nullptr
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpSM.cc:7272
(call_transact_and_set_next_state)> (http) [79] State Transition:
SM_ACTION_API_READ_REQUEST_HDR -> SM_ACTION_INTERNAL_CACHE_NOOP
[Feb 28 12:16:24.833] Server {0x7f7dceee7700} DEBUG: <HttpSM.cc:1474
(state_api_callout)> (http) [79]* calling plugin on hook
TS_HTTP_SEND_RESPONSE_HDR_HOOK at hook 0x55af01a68ec0*

Post by Alan Carroll
Proxy response should be after most hooks, i.e. what is sent back to the
user agent. If you really want to be sure, I'd use wireshark. If you are
doing a transform, you will generally need wireshark to see the transformed
content.
On Wed, Feb 28, 2018 at 6:06 AM, supraja sridhar <

Post by supraja sridhar
Hi,
Is there a way to look at the response after it is subjected to hooks in
ATS? I am running trafficserver in foreground with the -Thttp tag and I can
see OS request, Proxy request, Proxy request after hooks for requests but
only OS response and Proxy response for response. I have a plugin similar
to blacklist-0 and would like to if the response transform has taken place.
Thanks,
Supraja