Expected behavior

According to RFC 7540 Pseudo-header fields MUST NOT appear in trailers. Endpoints MUST treat a request or response that contains undefined or invalid pseudo-header fields as malformed (Section 8.1.2.6). Requests with pseudo-header fields in trailers should be treated as malformed.

Actual behavior

Pseudo-header on trailers requests are not treated as malformed.

Steps to reproduce

Send a request with pseudo-headers in trailers.

Minimal yet complete reproducer code (or URL to code)

Because of using the same headers as trailers, this can be reproduced with the test

Netty version

4.1.97

JVM version (e.g. java -version)

openjdk version "17.0.7" 2023-04-18
IBM Semeru Runtime Open Edition 17.0.7.0 (build 17.0.7+7)
Eclipse OpenJ9 VM 17.0.7.0 (build openj9-0.38.0, JRE 17 Mac OS X amd64-64-Bit Compressed References 20230418_450 (JIT enabled, AOT enabled)
OpenJ9 - d57d05932
OMR - 855813495
JCL - 9d7a231edbc based on jdk-17.0.7+7)

OS version (e.g. uname -a)

Mac OS X x86_64