Section 5.5

crates/httpwg-macros/src/lib.rs

@@ -350,6 +350,20 @@ macro_rules! tests {
                     $body
                 }
             }
+
+            /// Section 5.5: Extending HTTP/2
+            mod _5_5_extending_http2 {
+                use super::__suite::_5_5_extending_http2 as __group;
+
+                /// Extension frames that appear in the middle of a header block
+                /// (Section 4.3) are not permitted; these MUST be treated as
+                /// a connection error (Section 5.4.1) of type PROTOCOL_ERROR.
+                #[test]
+                fn unknown_extension_frame_in_header_block() {
+                    use __group::unknown_extension_frame_in_header_block as test;
+                    $body
+                }
+            }
         }
     };
 }

crates/httpwg/src/rfc9113/_5_5_extending_http2.rs

@@ -0,0 +1,39 @@
+//! Section 5.5: Extending HTTP/2
+
+use fluke_buffet::IntoHalves;
+use fluke_h2_parse::{EncodedFrameType, Frame, FrameType, HeadersFlags, StreamId};
+
+use crate::{Conn, ErrorC};
+
+/// Extension frames that appear in the middle of a header block
+/// (Section 4.3) are not permitted; these MUST be treated as
+/// a connection error (Section 5.4.1) of type PROTOCOL_ERROR.
+pub async fn unknown_extension_frame_in_header_block<IO: IntoHalves + 'static>(
+    mut conn: Conn<IO>,
+) -> eyre::Result<()> {
+    let stream_id = StreamId(1);
+
+    conn.handshake().await?;
+
+    let headers = conn.common_headers();
+    let block_fragment = conn.encode_headers(&headers)?;
+
+    conn.write_headers(stream_id, HeadersFlags::EndStream, block_fragment)
+        .await?;
+
+    conn.write_frame(
+        Frame {
+            frame_type: FrameType::Unknown(EncodedFrameType {
+                ty: 0xff,
+                flags: 0x0,
+            }),
+            ..Default::default()
+        },
+        b"0".repeat(8),
+    )
+    .await?;
+
+    conn.verify_connection_error(ErrorC::ProtocolError).await?;
+
+    Ok(())
+}

crates/httpwg/src/rfc9113/mod.rs

@@ -37,3 +37,5 @@ pub mod _5_1_2_stream_concurrency;
 pub mod _5_3_1_stream_dependencies;
 
 pub mod _5_4_1_connection_error_handling;
+
+pub mod _5_5_extending_http2;