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https://issues.apache.org/jira/browse/SOLR-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229154#comment-13229154
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Erik Hatcher commented on SOLR-3161:
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bq. As hoss points out, not all searching request handlers inherit from
SearchHandler.
Then use /-prefixed handlers for those rather than qt. Or, simply add
whatever logic to the DispatchingRequestHandler that makes sense and let qt
dispatching happen there, not from SDF. The DispatchingRequestHandler in my
patch was merely an example; I really don't care what logic is in there to
determine what can be dispatched to, as I'd never use it myself.
bq. The ability to distinguish an update handler from a request handler doesn't
sound complex
Again, I'd say stuff whatever smarts desired down into a dispatching request
handler rather than making Solr's top-level dispatching logic more complicated
than need be.
But, I will say that having a better separated class hierarchy for search vs.
update handlers is a good thing in general.
> Use of 'qt' should be restricted to searching and should not start with a '/'
> -----------------------------------------------------------------------------
>
> Key: SOLR-3161
> URL: https://issues.apache.org/jira/browse/SOLR-3161
> Project: Solr
> Issue Type: Improvement
> Components: search, web gui
> Reporter: David Smiley
> Assignee: David Smiley
> Fix For: 3.6, 4.0
>
> Attachments: SOLR-3161-disable-qt-by-default.patch,
> SOLR-3161-dispatching-request-handler.patch,
> SOLR-3161-dispatching-request-handler.patch
>
>
> I haven't yet looked at the code involved for suggestions here; I'm speaking
> based on how I think things should work and not work, based on intuitiveness
> and security. In general I feel it is best practice to use '/' leading
> request handler names and not use "qt", but I don't hate it enough when used
> in limited (search-only) circumstances to propose its demise. But if someone
> proposes its deprecation that then I am +1 for that.
> Here is my proposal:
> Solr should error if the parameter "qt" is supplied with a leading '/'.
> (trunk only)
> Solr should only honor "qt" if the target request handler extends
> solr.SearchHandler.
> The new admin UI should only use 'qt' when it has to. For the query screen,
> it could present a little pop-up menu of handlers to choose from, including
> "/select?qt=mycustom" for handlers that aren't named with a leading '/'. This
> choice should be positioned at the top.
> And before I forget, me or someone should investigate if there are any
> similar security problems with the shards.qt parameter. Perhaps shards.qt can
> abide by the same rules outlined above.
> Does anyone foresee any problems with this proposal?
> On a related subject, I think the notion of a default request handler is bad
> - the default="true" thing. Honestly I'm not sure what it does, since I
> noticed Solr trunk redirects '/solr/' to the new admin UI at '/solr/#/'.
> Assuming it doesn't do anything useful anymore, I think it would be clearer
> to use <requestHandler name="/select" class="solr.SearchHandler"> instead of
> what's there now. The delta is to put the leading '/' on this request handler
> name, and remove the "default" attribute.
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