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https://issues.apache.org/jira/browse/HTTPCLIENT-2180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423206#comment-17423206
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Oleg Kalnichevski commented on HTTPCLIENT-2180:
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[~anuragagarwal56] I see the problem. So, really want to be able to pre-warm
complex routes with HTTP tunneling, proxy authentication and all bells and
whistles? In this case I see no way around executing a batch of cheap request
such as OPTIONS or HEAD and delaying endpoint release until completion of the
entire batch. What you will likely need is a custom method similar to
`#doExecute` that can execute multiple requests as a single operation. It is
not going to be easy but it is doable.
https://github.com/apache/httpcomponents-client/blob/master/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/InternalAbstractHttpAsyncClient.java#L165
Oleg
> Pre-init minimum number of connections
> --------------------------------------
>
> Key: HTTPCLIENT-2180
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2180
> Project: HttpComponents HttpClient
> Issue Type: New Feature
> Components: HttpClient (async), HttpClient (classic)
> Reporter: Anurag Agarwal
> Priority: Minor
> Labels: volunteers-wanted
> Fix For: Future
>
>
> Most of the applications suffer from a problem of cold start where we don't
> have connections created at the start of the application and thus the first
> few requests suffer by making a lot of connections.
> During deployment this can even pile up a lot of not completed request and
> may lead to losses.
> One suggestion I had in mind is to create few connections before the
> application has begun from the intended endpoints.
> Also sometimes the nautre of your traffic can be spiky in which scenario
> opening and closing a lot of connections also doesn't make sense.
>
> These can be solved with either or both of the suggestions:
> # Have a minConnectionPerHost policy in connection pool which won't let
> connection pool for a host to go below this number or make a new connection
> when it does. At the start of the http client these minimum connections will
> be created to the end services.
> # Provide an easy mechanism for use to create connections via
> ConnectionManager. Currently in PoolingAsyncConnectionManager one must give
> ConnectionInitiator which make it difficult to directly use the connection
> manager to create connections.
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