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From Daniel Gruno <humbed...@apache.org>
Subject Re: [users@httpd] Refiring requests to proxy backend
Date Fri, 18 Dec 2015 16:29:17 GMT
I'm interested in knowing how you did it in mod_python. Do you use an
external http lib and process the result yourself? That's certainly also
possible with mod_lua.

With regards,
Daniel.

On 12/18/2015 05:12 PM, Daniel Gruno wrote:
> I think you need two phases here, as mod_lua doesn't itself do the
> proxying, but delegates it to mod_proxy.
> 
> First, http://modlua.org/recipes/loadbalancing will show you how to proxy.
> 
> Secondly, you could then set up a handler for the specific HTTP code
> using ErrorDocument or an output filter.
> 
> I haven't tried this myself (the 'act on return code'), but it should work.
> 
> With regards,
> Daniel.
> 
> On 12/18/2015 04:23 PM, Jim Jagielski wrote:
>> I'm not a mod_lua expert, esp as it relates to exposing the
>> full Apache httpd API... it is possible that using r.handler
>> and specifying the proxy may work.
>>
>>> On Dec 18, 2015, at 8:05 AM, Jose Thomas <jostho@gmail.com> wrote:
>>>
>>> Jim,
>>>
>>> Sorry, I could not find the documentation on how to do this using mod_lua. Can
you please point me there ? 
>>>
>>> In my current setup which is on httpd 2.2 - we use modpython. For routing requests
(based on a header) we use a simple python script. For refiring the request (when a custom
response code is received), another python script is configured in a "PythonOutputFilter".
That script internally uses the python requests library. 
>>>
>>> We are upgrading to httpd 2.4 and wanted to see if this code can be ported to
mod_lua. I have already ported the first script (routing) to lua. Where i am clueless, is
how to resend the request to backend for the 2nd script in a "LuaOutputFilter".
>>>
>>> Thanks & regards,
>>> Jose
>>>
>>> On Fri, Dec 18, 2015 at 5:08 PM, Jim Jagielski <jim@jagunet.com> wrote:
>>> In general, if you prepend the URL w/ 'proxy:' and then
>>> use it in a subrequest, it will be processed as a proxy
>>> request.
>>>> On Dec 17, 2015, at 9:21 AM, Jose Thomas <jostho@gmail.com> wrote:
>>>>
>>>> All,
>>>>
>>>> I am using httpd 2.4 with mod_proxy (http) routing requests to multiple backends.
>>>>
>>>> I have a strange requirement. If a backend responds with a custom response
code - i need to re-execute the request to a different backend.
>>>>
>>>> What would be the right way to implement this functionality ?
>>>>
>>>> I was looking at mod_lua for a solution. The idea is to use a "LuaOutputFilter"
to check the response code, and then re-execute the request with a different backend. How
can i refire the request ? Should i use a lua httpclient library for this ? Is there a easier
way to do this ?
>>>>
>>>> Any other suggestions/comments are welcome.
>>>>
>>>> Version of stack
>>>> * Apache 2.4.6
>>>> * Lua 5.1.4
>>>>
>>>> Regards,
>>>> Jose
>>>> ____________
>>>>
>>>>
>>>>
>>>
>>>
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>>>
>>
>>
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> 
> 
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