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https://issues.apache.org/jira/browse/SOLR-6625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238876#comment-14238876
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Gregory Chanan commented on SOLR-6625:
--------------------------------------

The reason I didn't take that approach is that in some cases there's not enough 
context to figure out what you need to do.  It's essentially equivalent to just 
passing the HttpRequest to the callback (and would thus be superior if that's 
all we needed), but consider the following cases:
1) See SOLR-4470.  That makes use of SolrRequest.getPreemptiveAuthentication, 
so you'd need the actual SolrRequest
2) See the discussion above about SolrDispatchFilter.  In that case, the client 
needs to get the context of the SolrQueryRequest

> HttpClient callback in HttpSolrServer
> -------------------------------------
>
>                 Key: SOLR-6625
>                 URL: https://issues.apache.org/jira/browse/SOLR-6625
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrJ
>            Reporter: Gregory Chanan
>            Assignee: Gregory Chanan
>            Priority: Minor
>         Attachments: SOLR-6625.patch, SOLR-6625.patch, SOLR-6625.patch, 
> SOLR-6625.patch, SOLR-6625.patch, SOLR-6625.patch
>
>
> Some of our setups use Solr in a SPNego/kerberos setup (we've done this by 
> adding our own filters to the web.xml).  We have an issue in that SPNego 
> requires a negotiation step, but some HttpSolrServer requests are not 
> repeatable, notably the PUT/POST requests.  So, what happens is, 
> HttpSolrServer sends the requests, the server responds with a negotiation 
> request, and the request fails because the request is not repeatable.  We've 
> modified our code to send a repeatable request beforehand in these cases.
> It would be nicer if HttpSolrServer provided a pre/post callback when it was 
> making an httpclient request.  This would allow administrators to make 
> changes to the request for authentication purposes, and would allow users to 
> make per-request changes to the httpclient calls (i.e. modify httpclient 
> requestconfig to modify the timeout on a per-request basis).



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