Random Error Pages to be served using nginx

[Harish Sundararaj]

Hi all,

I'm looking for a way to serve random error pages for 504/502 errors.
In addition i also want  the error pages to be served based on the
$request_uri.

Something like this:
1) When this URL is requested:  http://mydomain.com/search?type=ABC
 and if the proxy returns a 504 or 502 and when the GET parameter 'type' has
'ABC' as value then serve
any random document  from "/path/to/custom/error/typeABC/"

2) and the same applies to http://mydomain.com/search?type=DEF just that the
directory to be used to serve
error document should be "/path/to/custom/error/typeDEF"

I'm sure this can be achieved with named locations and probably try_files.
But I'm just not able to get anything working.

Would appreciate some pointers.

Regards
Harish
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