Co-authored-by: Will Cosgrove <will@cosgrove.email>

increasing the number of workers in httpbin and nghttp2 significantly.

the proxy has been terminating sockets before the test can succeed when
ran in parallel and sharing connections.

Abanoub Ghadban authored Dec 27, 2025 and Tiago committed Jan 07, 2026

When a streaming request fails and is retried, the request transitions
back to :idle state. Previously, @headers_sent was not reset during this
transition, causing the :body callback to fire prematurely on retry.
This resulted in nested handle() calls that crashed with
HTTP2::Error::InternalError because the stream was already in
half_closed_local state.

This fix resets @headers_sent to false when transitioning to :idle,
ensuring a clean slate for retry attempts.

Fixes #124

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

test(stream_bidi): add integration test for retry after headers sent

Replace unit tests with proper integration test that verifies the
actual behavior: streaming requests succeed on retry after connection
failure (GOAWAY).

Adds BidiFailOnce servlet that:
- First stream: sends response headers, then GOAWAY (simulating failure)
- Second stream: works normally like Bidi

The test verifies that without the fix, HTTP2::Error::InternalError
occurs due to @headers_sent not being reset on retry.

Related to #124

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

as it's difficult to support anything else ATM, and there's no real use case

the loop to drop timers was running two times in a row for #fire calls,
which could inadvertedly drop timers which didn't elapsed at that point
(potentially an issue when observing multiple connections at once).

if there is nothing to select and all selectables were popped, treat it as a sign to sleep

this refactors the god-object approach relying on HTTPX::Resolver and
its helpers managing state, into an adapter layer on the
HTTPX::Resolver::Cache namespace, for which a memory adapter, which
implements the current default behaviour of in-memory LRU cache, was
added. Other future adapters will have to implement the same API.

The cache is accessible via the options object `resolver_cache` method,
which accepts `:memory` by default, but can also be given a custom cache
object which implements the cache API.

This also fixes an issue whereby resolver cache access within a non main
ractor was not thread-safe.

Closes #368

```
irb(main):001> require "httpx"
/home/user/code/httpx/lib/httpx/options.rb:461: warning: method redefined; discarding old option_resolver_class
/home/user/code/httpx/lib/httpx/options.rb:407: warning: previous definition of option_resolver_class was here
```

Fix duplicate method warning when requiring httpx

See merge request !429

also renamed repeatable_request? to retryable_request?

this bypasses the change_requests check, as it's assumed that the next request with a refreshed token will succeed
git add lib -p

the new helper method allows fixing a long standing issue, as the change_requests set to true was a hack that could be dangerous, and the tretry_on callback could be overridden by the end user

this prevents a busy loop on connection

Auth plugin: Retry on 401 errors

See merge request !430