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https://issues.apache.org/jira/browse/SOLR-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13701616#comment-13701616
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Jack Krupansky commented on SOLR-5005:
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1. How about supporting "params" just as the 
StatelessScripteUpdateProcessorFactory does?
2. Is this a stand alone request handler that does nothing other than what is 
in the script, or does it subclass the search handler? If the latter, where in 
the query "lifecycle" does it hook in? If the former, how exactly does the 
script invoke the pieces of the traditional query processing lifecycle? Maybe 
both are needed.
3. What methods (full JS signature) would a Script RH need to implement?
                
> ScriptRequestHandler
> --------------------
>
>                 Key: SOLR-5005
>                 URL: https://issues.apache.org/jira/browse/SOLR-5005
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: David Smiley
>         Attachments: patch
>
>
> A user customizable script based request handler would be very useful.  It's 
> inspired from the ScriptUpdateRequestProcessor, but on the search end. A user 
> could write a script that submits searches to Solr (in-VM) and can react to 
> the results of one search before making another that is formulated 
> dynamically.  And it can assemble the response data, potentially reducing 
> both the latency and data that would move over the wire if this feature 
> didn't exist.  It could also be used to easily add a user-specifiable search 
> API at the Solr server with request parameters governed by what the user 
> wants to advertise -- especially useful within enterprises.  And, it could be 
> used to enforce security requirements on allowable parameter valuables to 
> Solr, so a javascript based Solr client could be allowed to talk to only a 
> script based request handler which enforces the rules.

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