v1.9.0

This is a SECURITY and feature release for the 1.x series of ReactPHP's HTTP component.

• Security fix: This release fixes a medium severity security issue in ReactPHP's HTTP server component
  that affects all versions between v0.8.0 and v1.8.0. All users are encouraged to upgrade immediately.
  (CVE-2023-26044 reported and fixed by @WyriHaximus)

• Feature: Support HTTP keep-alive for HTTP client (reusing persistent connections).
  (#481, #484, #486 and #495 by @clue)

  This feature offers significant performance improvements when sending many
  requests to the same host as it avoids recreating the underlying TCP/IP
  connection and repeating the TLS handshake for secure HTTPS requests.

  $browser = new React\Http\Browser();
  
  // Up to 300% faster! HTTP keep-alive is enabled by default
  $response = React\Async\await($browser->get('https://httpbingo.org/redirect/6'));
  assert($response instanceof Psr\Http\Message\ResponseInterface);

• Feature: Add Request class to represent outgoing HTTP request message.
  (#480 by @clue)

• Feature: Preserve request method and body for 307 Temporary Redirect and 308 Permanent Redirect.
  (#442 by @dinooo13)

• Feature: Include buffer logic to avoid dependency on reactphp/promise-stream.
  (#482 by @clue)

• Improve test suite and project setup and report failed assertions.
  (#478 by @clue, #487 and #491 by @WyriHaximus and #475 and #479 by @SimonFrings)