Hrishikesh Gadre created SOLR-9997:
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             Summary: Enable configuring SolrHttpClientBuilder via java system 
property
                 Key: SOLR-9997
                 URL: https://issues.apache.org/jira/browse/SOLR-9997
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 6.3
            Reporter: Hrishikesh Gadre


Currently SolrHttpClientBuilder needs to be configured via invoking 
HttpClientUtil#setHttpClientBuilder(...) API. On the other hand SolrCLI 
attempts to support configuring SolrHttpClientBuilder via Java system property. 
 
https://github.com/apache/lucene-solr/blob/9f58b6cd177f72b226c83adbb965cfe08d61d2fb/solr/core/src/java/org/apache/solr/util/SolrCLI.java#L265

But after changes for SOLR-4509, this is no longer working. This is because we 
need to configure HttpClientBuilderFactory which can provide appropriate 
SolrHttpClientBuilder instance (e.g. Krb5HttpClientBuilder). I verified that 
SolrCLI does not work in a kerberos enabled cluster. During the testing I also 
found that SolrCLI is hardcoded to use basic authentication,

https://github.com/apache/lucene-solr/blob/9f58b6cd177f72b226c83adbb965cfe08d61d2fb/solr/core/src/java/org/apache/solr/util/SolrCLI.java#L156

This jira is to add support for configuring HttpClientBuilderFactory as a java 
system property so that SolrCLI as well as other Solr clients can also benefit 
this. Also we should provide a HttpClientBuilderFactory which support 
configuring preemptive basic authentication so that we can remove the hardcoded 
basic auth usage in SolrCLI (and enable it work with kerberos). 






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