Spring JdkClientHttpRequest may block indefinitely

Affects: 6

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When using JdkClientHttpRequestFactory the request may block indefinitely, even if a request timeout is configured.

Details about the issue:

• https://mail.openjdk.org/pipermail/net-dev/2021-October/016672.html
• https://bugs.openjdk.org/browse/JDK-8258397

This is the problematic line, that should be updated to an async call with an immediate get on the CompletableFuture:

https://github.com/spring-projects/spring-framework/blob/28e5468162d5a643cb0cf987f59fa4794c7714b8/spring-web/src/main/java/org/springframework/http/client/JdkClientHttpRequest.java#L94