On Wed, 2009-09-16 at 17:56 +0800, Chancey wrote:
> 
> Back-end to provide search suggest services .
>
> Example:
>
> Two request url:
> a . http://xxx/a?q=a
> b . http://xxx/a?q=b
>
> Response results :
> a. xxxxxxxxxx
> b. null
>
> The results of a need to be cached , b don't need.

You can run nginx without caching enforcement ( don't use
proxy_cache_valid ) and modify(*) "search suggest service" so it will
return headers allowing caching for responses other that null.

(*) very likely modification is adding single line of code setting
"Expire:" header before returning result.
>
--
Mirosław "Psyborg" Jaworski
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