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https://issues.apache.org/jira/browse/SOLR-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217409#comment-13217409
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James Dyer commented on SOLR-3161:
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I thinks its nice that you can currently set up various handler with all of the
different parameters, etc set up in your config and then clients don't have to
worry about setting. (ie...what is the secret sauce for relevance, anyway, and
which spelling dictionary goes with which "qf" list?, etc) Its just easier to
have this all in the configuration. This is the beauty of "qt" so whatever
solution we find here, I'd really like it if this beauty doesn't get spoiled.
By the way, when we were converting an app from Endeca, we used "qt" to roughly
emulate Endeca's "search interface" concept, which is basically like a dismax
request handler that behaves as if it were a field. Imagine having multiple
"qt"s (Request Handlers) set up, each with its own "qf", spelling config,
highlighter config, etc, and then being able to do something like this:
q=Handler1:(+this +that) AND Handler2:(something else) . Someday I would love
to see this kind of enhancement (best I could tell you can't do anything like
this even with local params). But if we lock down qt too much or eliminate it
altogether, we might make it harder to have this kind of possibility in the
future.
> 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
>
>
> 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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