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From Erlend Garåsen (JIRA) <>
Subject [jira] [Commented] (CONNECTORS-1564) Support preemptive authentication to Solr connector
Date Mon, 07 Jan 2019 12:18:00 GMT


Erlend Garåsen commented on CONNECTORS-1564:

{quote}Could you please ask the contributor if he has considered using
 AuthCache to implement preemptive BASIC authentication as described
I'm afraid this is more complicated to implement since we are using SolrJ. HttpSolrServer's
constructor takes basically two parameters, a URL and a HttpClient. I tried to implement the
code example in another project using SolrJ, but the tricky part was to add a required HttpClientContext.

Maybe there are solutions to that, but the short answer is that adding an interceptor was
quite easy. And the interceptor class might be useful for other output connectors.

Regarding the expect 100-continue approach. We implemented this for some years ago as far
as I remember. And it seems that we have implemented it in our RequestConfig (in the class


The whole idea behind the contribution was to get around the following exception:

{{org.apache.http.client.NonRepeatableRequestException: Cannot}}
{{retry request with a non-repeatable request entity.}}

So at the moment, I'm not sure whether posting to a Solr server with basic authentication
works in the latest MCF version. I would appreciate if someone else could verify this. Regardless
of preemptive authentication is a correct way to get around the exception, I still think it's
a good idea in order to post documents more efficiently.

> Support preemptive authentication to Solr connector
> ---------------------------------------------------
>                 Key: CONNECTORS-1564
>                 URL:
>             Project: ManifoldCF
>          Issue Type: Improvement
>          Components: Lucene/SOLR connector
>            Reporter: Erlend Garåsen
>            Assignee: Karl Wright
>            Priority: Major
>         Attachments: CONNECTORS-1564.patch
> We should post preemptively in case the Solr server requires basic authentication. This
will make the communication between ManifoldCF and Solr much more effective instead of the
>  * Send a HTTP POST request to Solr
>  * Solr sends a 401 response
>  * Send the same request, but with a "{{Authorization: Basic}}" header
> With preemptive authentication, we can send the header in the first request.

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