Jan Stourac created WFLY-12527: ---------------------------------- Summary: Invalid/benevolent hpack decoding of huffman-encoded string literal with EOS symbol Key: WFLY-12527 URL: https://issues.jboss.org/browse/WFLY-12527 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 17.0.1.Final Reporter: Jan Stourac Assignee: Flavia Rainone I can see failing HTTP/2 test in [thirdparty testsuite|https://github.com/summerwind/h2spec] against WildFly: {code} 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) {code} This error started to occur after [this fix|https://github.com/summerwind/h2spec/commit/ce109b0cae4731610dbccded0...] has been done in the testsuite itself few months ago. There is expected a '{{Compression error}}' to be returned by server followed by connection closure, although WildFly simply responds with a '{{Data}}' packet expecting further communication. I've also checked with latest WildFly master branch and Undertow in version of {{2.0.26.Final}}. Still same issue. Note that Apache HTTP {{2.4.29}} passes this particular test successfully. -- This message was sent by Atlassian Jira (v7.13.5#713005)