Invalid/benevolent hpack decoding of huffman-encoded string literal with EOS symbol

start WildFly, e.g.: ./bin/standalone.sh get thirdparty h2spec testsuite execute testsuite with following command: $ ./h2spec -h localhost -p 8443 -k -S -t hpack/5 and see following output: HPACK: Header Compression for HTTP/2 5. Primitive Type Representations 5.2. String Literal Representation ✔ 1: Sends a Huffman-encoded string literal representation with padding longer than 7 bits ✔ 2: Sends a Huffman-encoded string literal representation padded by zero × 3: Sends a Huffman-encoded string literal representation containing the EOS symbol -> The endpoint MUST treat this as a decoding error. Expected: GOAWAY Frame (Error Code: COMPRESSION_ERROR) Connection closed Actual: DATA Frame (length:1504, flags:0x01, stream_id:1) Failures: HPACK: Header Compression for HTTP/2 5. Primitive Type Representations 5.2. String Literal Representation × 3: Sends a Huffman-encoded string literal representation containing the EOS symbol -> The endpoint MUST treat this as a decoding error. Expected: GOAWAY Frame (Error Code: COMPRESSION_ERROR) Connection closed Actual: DATA Frame (length:1504, flags:0x01, stream_id:1) Finished in 2.5380 seconds 3 tests, 2 passed, 0 skipped, 1 failed