[jira] [Created] (HTTPCLIENT-2394) Virtual Thread (JDK 21) support for classic CloseableHttpClient — disabled by default

["Arturo Bernal (Jira)" <ji...@apache.org>]

Arturo Bernal created HTTPCLIENT-2394:
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             Summary: Virtual Thread (JDK 21) support for classic CloseableHttpClient — disabled by default
                 Key: HTTPCLIENT-2394
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2394
             Project: HttpComponents HttpClient
          Issue Type: New Feature
            Reporter: Arturo Bernal


Add support to run the classic (blocking) HTTP transport on *JDK 21 Virtual Threads* while preserving the existing public API and error semantics. The feature is *disabled by default* and can be enabled via builder settings. An additional toggle allows running the response handler on a virtual thread as well.

*Motivation*
 * Reduce platform thread usage and memory footprint under high concurrency.

 * Keep the blocking I/O programming model; no migration to the async API required.

 * Provide a simpler path than the Classic→Async adapter.

*Scope*
 * Builder settings to enable virtual-thread execution and configure the executor.

 * Optional setting to execute {{HttpClientResponseHandler}} on a virtual thread.

 * Preserve current behavior for errors and closing:

 ** Task rejection → {{IOException("client closed", cause)}}

 ** Interruption → cancel task, restore interrupt flag, throw {{InterruptedIOException}}

 ** Execution errors → unwrap {{IOException}} / {{RuntimeException}} / {{{}Error{}}}, otherwise wrap in {{IOException}}

 * Runtime activation on *JDK 21+* (feature remains inactive on older JDKs).

 * Mark feature as *experimental* for one minor cycle.



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