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https://issues.apache.org/jira/browse/SOLR-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240963#comment-13240963
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David Smiley commented on SOLR-3161:
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As an aside, this default request handler patch should probably have been
another JIRA issue instead of this JIRA issue including several different
things including clarifying the default config.
I stupidly committed the patch without testing and it broke the build because
solr/core/src/test-files/solr/conf/solrconfig.xml (and possibly other test
configs) has a <requestHandler name="standard"> (with no default="true").
Either the config(s) should be updated to be "/select" based (which I don't
mind doing) or I could add back "standard" as eligible for default request
handler nomination. I committed the latter now because it's the safest.
/select should takes precedence. I also committed a warning message if there
is none registered:
{code}
if(get("") == null)
log.warn("no default request handler is registered (either '/select' or
'standard')");
{code}
> 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: 4.0
>
> Attachments: SOLR-3161-disable-qt-by-default.patch,
> SOLR-3161-dispatching-request-handler.patch,
> SOLR-3161-dispatching-request-handler.patch,
> SOLR-3161_limit_qt=_____to_refer_to_SearchHandlers,_and_shards_qt_likewise.patch,
> SOLR-3161_make_the_slash-select_request_handler_the_default.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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