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https://issues.apache.org/jira/browse/SOLR-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228629#comment-13228629
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Yonik Seeley commented on SOLR-3161:
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bq. Regarding qt=/update what is your opinion on a compromise way forward?
The most flexible way would be to add a method to SolrRequestHandler like
"boolean indirectDispatch(req)" that would work for any type of request handler
(and update handlers would default to false).
But if one doesn't want this feature bleeding into the whole request handler
architecture, we could distinguish update handlers from other handlers by
adding a new base class or a marker interface.
> 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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