fix: check Content-Length/Transfer-Encoding before method in shouldNotContainBody()

[predic8]

Summary

Fixes #3182.

Request.shouldNotContainBody() unconditionally treated GET, HEAD, and CONNECT as bodiless before ever checking Content-Length/Transfer-Encoding. This method gates whether the request body is actually read off the socket in Message.createBody() — for every other method, the header checks decide whether a body follows, but for GET/HEAD/CONNECT that logic was short-circuited before it could run.

HTTP doesn't forbid a body on GET; if a client sends one with an explicit Content-Length or chunked encoding, the bytes were left unread in the socket stream. On a keep-alive connection, the next read loop would then misparse those leftover bytes as the start line of the next request, corrupting or hanging the connection.

Fix

Reordered the checks in Request.shouldNotContainBody() so Content-Length/Transfer-Encoding take priority, falling back to the method-based default (and the HTTP/1.0 default) only when no header indicates a body. Behavior for GET/HEAD/CONNECT with no body headers is unchanged.

Testing

Added getWithBodyContentLength, getWithBodyChunked, and getWithoutBody to RequestTest, mirroring the existing optionsWith* coverage. All 33 tests in RequestTest pass.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes

  • Improved HTTP request body detection for requests using Content-Length or Transfer-Encoding.
  • Requests with incomplete or improperly terminated transfer encoding are now rejected instead of being read indefinitely.
  • Valid chained transfer encodings ending in chunked are accepted correctly.
  • GET requests with declared body content continue to be handled correctly.

• Tests

  • Added coverage for transfer-encoding validation and request body detection scenarios.

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• core/src/main/java/com/predic8/membrane/core/http/Request.java

🚧 Files skipped from review as they are similar to previous changes (1)

• core/src/main/java/com/predic8/membrane/core/http/Request.java

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📝 Walkthrough

Walkthrough

Request now preserves framed GET bodies and rejects Transfer-Encoding values that do not end in chunked. Tests cover body detection, invalid transfer codings, split headers, and valid chunked requests.

Changes

Request body framing

Layer / File(s)	Summary
Header-prioritized body detection and transfer-coding validation core/src/main/java/com/predic8/membrane/core/http/Request.java	Request checks body-indicating headers before method and HTTP version rules. It rejects non-final transfer codings before body creation and logs the masked value.
Request body framing tests core/src/test/java/com/predic8/membrane/core/http/RequestTest.java	Tests cover GET body detection, invalid and split transfer codings, valid chunked encoding, and raw request parsing.

Estimated code review effort: 2 (Simple) | ~15 minutes

Merge Risk: ⚪ Minimal · up to c08ba

This localized fix corrects request-body detection for applicable HTTP methods while preserving existing no-body behavior. No actionable merge-blocking risk remains beyond normal checks.

Poem

A rabbit checked each header line
And found the body’s proper sign.
Bad codings stopped before the read,
Chunked requests moved ahead.
GET bytes now cross the finish line.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 23.08% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: checking Content-Length and Transfer-Encoding before method-based body handling.
Linked Issues check	✅ Passed	The changes satisfy issue #3182 by prioritizing explicit Content-Length and Transfer-Encoding headers, so request bodies for methods such as GET, HEAD, and CONNECT are read correctly. The tests cover …
Out of Scope Changes check	✅ Passed	The changes remain within request body detection and Transfer-Encoding validation. The added tests directly cover this behavior. No unrelated code changes are identified.

Full details: Linked Issues check

Explanation

The changes satisfy issue #3182 by prioritizing explicit Content-Length and Transfer-Encoding headers, so request bodies for methods such as GET, HEAD, and CONNECT are read correctly. The tests cover the required body-detection cases.

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Actionable comments posted: 1

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Inline comments:
In `@core/src/main/java/com/predic8/membrane/core/http/Request.java`:
- Around line 150-151: Update Request.shouldNotContainBody() and the
body-selection flow in Message.createBody() to reject any Transfer-Encoding
whose final coding is not chunked, including gzip without Content-Length, before
attempting to read the body. Preserve normal ChunkedBody selection for a final
chunked coding and avoid reading unsupported or ambiguous bodies until EOF on
persistent connections.

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📒 Files selected for processing (2)

• core/src/main/java/com/predic8/membrane/core/http/Request.java
• core/src/test/java/com/predic8/membrane/core/http/RequestTest.java

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