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From "Erik Hatcher (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-3161) Use of 'qt' should be restricted to searching and should not start with a '/'
Date Mon, 27 Feb 2012 20:08:46 GMT


Erik Hatcher commented on SOLR-3161:

I'll just leave this with my final thoughts on it from an architecture/elegance perspective...
paths represent resources, or perhaps rather "views" of resources.  Solr serves up sets of
content, basically.  Treating these views into sets/subsets as first class "resources" HTTP-wise
(HTTP being something we really tout in Solr-land as a big fat value-add over other networking
protocols, caching/proxies/etc-wise, tried/true APIs everywhere) to me just seems like the
Right Thing to do.

Admittedly a RESTafarian, I realize it's a toematoe/tamahtoe-qt/path here, as path/request-param,
6 of 1 down low.  

As always Hoss has a way of proposing solutions to disagreements with some poignant clarity.
 So I'm +1 to this approach:

if he root goal is "make solr safer for people who don't want/expect "qt" based requests then
unless i'm overlooking something it seems like there is a far simpler and more straightforward

a) change the example solrocnfig to use handleSelect="false"
b) remove the (long ago deprecated) SolrServlet

if handleSelect == false, then the request dispatcher won't look at "/select" requests at
all (unless someone has a handler named "/select") and it would do dispatching based on the
"qt" param. currently if that's false the logic falls throough to the SolrServlet, but if
that's been removed then the request will just fail.

So new users who copy the example will have only path based request handlers by default, and
will have to go out of their way to set handleSelect=true to get qt based dispatching.

I'll give this a trunk whirl myself shortly and see how it goes.  I like it the compromise
and the example enforcement of "best practices".

bq. Bonus points: someone can write a DispatchingRequestHandler that can optionally be configured
with some name (such as "/select") and does nothing put look for a "qt" param and forward
to the handler with that name – but it can have configuration options indicating which names
are permitted (and any other names would be rejected)

LOL - true true.  Better that it exist as an explicit Dispatching implementation, if you ask
me, though.  Ironicly, once upon a time... [LookupDispatchAction|[SUBMIT]%20LookupDispatchAction%20-%20how%20to%20handle%20multiple%20%20%20%20html%3Asubmit%20%20%20%20buttons+page:1+mid:6bwnfwo5ex5ae2zq+state:results]

Definitely +1 to including the Bonus Points into the equation too.  Thanks Hoss for stating
the nicely obvious way forward.
> Use of 'qt' should be restricted to searching and should not start with a '/'
> -----------------------------------------------------------------------------
>                 Key: SOLR-3161
>                 URL:
>             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
> 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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