Imported release from original tag date 2023-02-22.

• Feature: Forward compatibility with upcoming Promise v3. (#188 by @clue)

• Feature: Full PHP 8.2 compatibility. (#194 and #207 by @clue)

• Feature: Load environment variables from $_ENV, $_SERVER and getenv(). (#205 by @clue)

• Feature: Update to support Content-Length response header on HEAD requests. (#186 by @clue)

• Feature / Fix: Consistent handling for HTTP responses with multiple header values (PHP SAPI). (#214 by @pfk84)

• Fix: Respect explicit response status code when Location response header is given (PHP SAPI). (#191 by @jkrzefski)

• Minor documentation improvements. (#189 by @clue)

• Add PHPStan to test environment on level max and improve type definitions. (#200, #201 and #204 by @clue)

• Improve test suite and report failed assertions. (#199 by @clue and #208 by @SimonFrings)