fix: add E2E tests and CHANGELOG entry for SERVER_PROTOCOL (#60)

[s2x]

Summary

• Adds E2E test testServerProtocolHasHttpPrefixE2E() verifying SERVER_PROTOCOL includes HTTP/ prefix
• Adds CHANGELOG entry under [Unreleased] > Added section

Changes

• tests/SymfonyControllerTest.php - new E2E test method
• CHANGELOG.md - entry referencing issue RequestConverter — SERVER_PROTOCOL has wrong format (missing HTTP/ prefix) #60

Verification

• All PHPUnit tests pass
• php-cs-fixer, phpstan, rector all pass

[s2x]

Code Review

Thanks for this PR. The test itself is well-structured, but there are several issues with the CHANGELOG entry that need to be addressed before merge.

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Important

1. CHANGELOG entry is under the wrong section

The entry is placed under ### Added, but it describes a fix ("Fixed SERVER_PROTOCOL format..."). The project has a ### Fixed section that should be used here. Compare with the existing StreamedResponse entry (line 16) which correctly uses ### Added with the framing "Added E2E tests for..." — that's the appropriate pattern when a PR only adds test coverage.

2. CHANGELOG wording is misleading

"Fixed SERVER_PROTOCOL format to include HTTP/ prefix (#60)" reads as if this PR introduced the actual code fix. However, the fix ('HTTP/' . $rawRequest->protocolVersion()) was already merged in PR #101 (commit cac2de8). This PR only adds test coverage and documentation. The entry should reflect that — e.g., "Added E2E test verifying SERVER_PROTOCOL includes HTTP/ prefix (#60)".

3. Duplicate CHANGELOG entry

The fix is already documented on line 96 of CHANGELOG.md:

SERVER_PROTOCOL now has correct HTTP/1.1 format instead of 1.1

Adding a second entry under [Unreleased] creates duplication. Either:

• Remove the new entry entirely (the fix is already documented), or
• Keep it but reword to clarify this PR adds test coverage for the fix, not the fix itself

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Minor

4. Test doesn't verify HTTP/2.0 path

The raw request is hardcoded to HTTP/1.1. If the implementation uses 'HTTP/' . $rawRequest->protocolVersion(), it would be valuable to also assert against HTTP/2.0 to confirm the prefix logic works for other protocol versions. Not critical since HTTP/1.1 is the common case and the implementation is trivial string concatenation, but worth considering for completeness.

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Summary

The E2E test is solid — it follows existing patterns, uses dual assertions (server->get('SERVER_PROTOCOL') and getProtocolVersion()), and correctly verifies the behavior described in issue #60. The CHANGELOG entry needs rewording and/or deduplication before this is ready to merge.