Consider "Retry-After" header in Java HTTP Client

[kwin]

Add test

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[kwin]

Waiting for upstream build fix @gnodet.

[gnodet]

Clean, well-scoped change that adds Retry-After header support to the JDK HTTP transport by wrapping the existing linear backoff with methanol's retryAfterOr(). The test is well-designed, and all inheriting test classes are properly handled.

Two minor style notes (non-blocking):

1. Method name casing: tooManyRequestswith runs words together — consider tooManyRequests_withRetryAfterHeader for consistency with the file's underscore convention.

2. Field initialization: serverErrorHeaders defaults to null — initializing to Collections.emptyMap() would be more defensive and consistent with the 2-arg delegating overload.

This review was generated by an AI agent and may contain inaccuracies. Please verify all suggestions before applying.

Claude Code on behalf of gnodet

[gnodet]

Minor: inconsistent casing — tooManyRequestswith runs the words together. Consider:

Suggested change

	@Test
	protected void testRetryHandler_tooManyRequests_withRetryAfterHeader_explicitCount_positive() throws Exception {

[gnodet]

Both suggestions addressed — looks good. 👍

Claude Code on behalf of gnodet

[github-actions]

@kwin Please assign appropriate label to PR according to the type of change.