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https://issues.apache.org/jira/browse/TS-4627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15359762#comment-15359762
 ] 

ASF GitHub Bot commented on TS-4627:
------------------------------------

Github user jpeach commented on a diff in the pull request:

    https://github.com/apache/trafficserver/pull/779#discussion_r69363133
  
    --- Diff: plugins/experimental/ts_lua/ts_lua.c ---
    @@ -116,6 +116,69 @@ TSRemapDeleteInstance(void *ih)
       return;
     }
     
    +void
    +TSRemapOSResponse(void *ih, TSHttpTxn rh, int os_response_type)
    --- End diff --
    
    This function is practically identical to ``TSRemapdoRemap()``. Factor into 
a common subroutine.


> ts_lua plugin - support TSRemapOSResponse() related functionality
> -----------------------------------------------------------------
>
>                 Key: TS-4627
>                 URL: https://issues.apache.org/jira/browse/TS-4627
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Lua, Plugins
>            Reporter: Kit Chan
>            Assignee: Kit Chan
>             Fix For: 7.0.0
>
>
> I want to add enhancement to ts_lua so I can write script to take advantage 
> of the TSRemapOSResponse() related functionality.
> here is one such example
> {code}
> function do_os_response()
>     ts.debug('do_os_response')
>     ts.http.enable_redirect(0)
>     local st = ts.http.get_server_state()
>     if st == TS_LUA_SRVSTATE_CONNECTION_ALIVE then
>       ts.debug('alive')
>       ts.http.enable_redirect(0)
>     else
>       ts.debug('not alive')
>       ts.http.redirect_url_set('http://www.cnn.com')
>       ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
>     end
> end
> function send_response()
>     ts.debug('send_response')
> end
> {code}
> Basically it would allow me to do something when origin server fails to 
> connect (such as DNS error, timeout, etc)



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