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https://issues.apache.org/jira/browse/SOLR-15223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17432436#comment-17432436
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Jan Høydahl commented on SOLR-15223:
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Question: Are all SolrClient variants migrated to the Http2 Jetty-client? I did 
a quick walkthrough and found
{code:java}
HttpSolrClient                 Http2SolrClient
CloudSolrClient                CloudHttp2SolrClient
HttpClusterStateProvider       Http2ClusterStateProvider
LBHttpSolrClient               LBHttp2SolrClient
ConcurrentUpdateSolrClient     ConcurrentUpdateHttp2SolrClient {code}
These all look good, and have common code in a base class. However, this client 
seems to be HTTP1 only
{code:java}
DelegationTokenHttpSolrClient {code}
And these classes are more utilities for setting up the ApacheHttpClient, I 
don't know if they need HTTP2 counterparts:
{code:java}
HttpClientUtil
SolrHttpClientBuilder
SolrHttpClientContextBuilder  {code}
So I guess the proposal is to deprecate these in 8.11, and remove from main 
(along with the org.apache.httpcomponents:httpclient dependencies):
{code:java}
HttpSolrClient            
CloudSolrClient           
HttpClusterStateProvider  
LBHttpSolrClient          
ConcurrentUpdateSolrClient {code}
Question: Do we want to keep the Http2 naming or should we make the old names 
as "wrappers", so that HttpSolrClient in 9.0 will actually use Http2SolrClient? 
I guess users are already using the Http2-vairants in their code and it would 
be too much to tell them to change that once again?

> Deprecate HttpSolrClient, mark httpcomponents dep as "optional" in SolrJ
> ------------------------------------------------------------------------
>
>                 Key: SOLR-15223
>                 URL: https://issues.apache.org/jira/browse/SOLR-15223
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrJ
>            Reporter: David Smiley
>            Priority: Blocker
>              Labels: newdev
>             Fix For: main (9.0)
>
>
> Solr has had an HTTP/2 based SolrClient since 8.0.  Maintaining both HTTP/1 
> and HTTP/2 clients is a pain for maintenance of the project as it sometimes 
> means duplicative (or partially implemented) work, especially for 
> authentication but also sometimes metrics or tracing.  Both adds extra 
> dependencies for SolrJ and thus our users.  It's difficult to grok a codebase 
> using two different HTTP client frameworks.
> In this issue, mark HttpSolrClient (and related ones) as deprecated; point to 
> HTTP/2 equivalents.  Furthermore, mark the Apache "httpcomponents" libs as 
> "optional" in the produced Maven pom.xml so that users have to explicitly 
> opt-in to use it.  Announce this in the Solr users list as well.
> Out of scope to this issue is completely cutting over within Solr itself.



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