Use iana H2 error code description

The iana h2 error code descriptions
(https://www.iana.org/assignments/http2-parameters/http2-parameters.xhtml#error-code) seem to be more comprehensive and shorter.

src/frame/reason.rs

@@ -62,23 +62,20 @@ impl Reason {
     /// Get a string description of the error code.
     pub fn description(&self) -> &str {
         match self.0 {
-            0 => "not a result of an error",
-            1 => "unspecific protocol error detected",
-            2 => "unexpected internal error encountered",
-            3 => "flow-control protocol violated",
-            4 => "settings ACK not received in timely manner",
-            5 => "received frame when stream half-closed",
-            6 => "frame with invalid size",
-            7 => "refused stream before processing any application logic",
-            8 => "stream no longer needed",
-            9 => "unable to maintain the header compression context",
-            10 => {
-                "connection established in response to a CONNECT request was reset or abnormally \
-                 closed"
-            }
-            11 => "detected excessive load generating behavior",
-            12 => "security properties do not meet minimum requirements",
-            13 => "endpoint requires HTTP/1.1",
+            0 => "graceful shutdown",
+            1 => "protocol error detected",
+            2 => "implementation fault",
+            3 => "flow-control limits exceeded",
+            4 => "settings not acknowledged",
+            5 => "frame received for closed stream",
+            6 => "frame size incorrect",
+            7 => "stream not processed",
+            8 => "stream cancelled",
+            9 => "compression state not updated",
+            10 => "TCP connection error for CONNECT method",
+            11 => "processing capacity exceeded",
+            12 => "negotiated TLS parameters not acceptable",
+            13 => "use HTTP/1.1 for the request",
             _ => "unknown reason",
         }
     }
@@ -129,6 +126,9 @@ impl fmt::Debug for Hex {
 
 impl fmt::Display for Reason {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        write!(fmt, "{}", self.description())
+        match self.0 {
+            0..=13 => write!(fmt, "{}", self.description()),
+            _ => write!(fmt, "unknown error code {}", self.0),
+        }
     }
 }

tests/h2-tests/tests/client_request.rs

@@ -413,7 +413,7 @@ async fn send_reset_notifies_recv_stream() {
             let err = body.next().await.unwrap().expect_err("RecvBody");
             assert_eq!(
                 err.to_string(),
-                "stream error sent by user: refused stream before processing any application logic"
+                "stream error sent by user: stream not processed"
             );
         };
 
@@ -676,7 +676,7 @@ async fn sending_request_on_closed_connection() {
         };
 
         let poll_err = poll_fn(|cx| client.poll_ready(cx)).await.unwrap_err();
-        let msg = "connection error detected: unspecific protocol error detected";
+        let msg = "connection error detected: protocol error detected";
         assert_eq!(poll_err.to_string(), msg);
 
         let request = Request::builder()

tests/h2-tests/tests/codec_read.rs

@@ -210,7 +210,7 @@ async fn update_max_frame_len_at_rest() {
     assert_eq!(codec.max_recv_frame_size(), 16_384);
     assert_eq!(
         codec.next().await.unwrap().unwrap_err().to_string(),
-        "frame with invalid size"
+        "frame size incorrect"
     );
 
     // drain codec buffer

tests/h2-tests/tests/flow_control.rs

@@ -217,7 +217,7 @@ async fn recv_data_overflows_connection_window() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: flow-control protocol violated"
+                "connection error detected: flow-control limits exceeded"
             );
         };
 
@@ -227,7 +227,7 @@ async fn recv_data_overflows_connection_window() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: flow-control protocol violated"
+                "connection error detected: flow-control limits exceeded"
             );
         };
         join(conn, req).await;
@@ -278,7 +278,7 @@ async fn recv_data_overflows_stream_window() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "stream error detected: flow-control protocol violated"
+                "stream error detected: flow-control limits exceeded"
             );
         };
 
@@ -358,7 +358,7 @@ async fn stream_error_release_connection_capacity() {
                 .expect_err("body");
             assert_eq!(
                 err.to_string(),
-                "stream error detected: unspecific protocol error detected"
+                "stream error detected: protocol error detected"
             );
             cap.release_capacity(to_release).expect("release_capacity");
         };

tests/h2-tests/tests/push_promise.rs

@@ -164,7 +164,7 @@ async fn recv_push_when_push_disabled_is_conn_error() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 
@@ -174,7 +174,7 @@ async fn recv_push_when_push_disabled_is_conn_error() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 
@@ -388,7 +388,7 @@ async fn recv_push_promise_skipped_stream_id() {
                 .unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 
@@ -398,7 +398,7 @@ async fn recv_push_promise_skipped_stream_id() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 
@@ -446,7 +446,7 @@ async fn recv_push_promise_dup_stream_id() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 
@@ -456,7 +456,7 @@ async fn recv_push_promise_dup_stream_id() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: unspecific protocol error detected"
+                "connection error detected: protocol error detected"
             );
         };
 

tests/h2-tests/tests/stream_states.rs

@@ -209,7 +209,7 @@ async fn errors_if_recv_frame_exceeds_max_frame_size() {
             let err = res.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: frame with invalid size"
+                "connection error detected: frame size incorrect"
             );
         };
 
@@ -218,7 +218,7 @@ async fn errors_if_recv_frame_exceeds_max_frame_size() {
             let err = h2.await.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error detected: frame with invalid size"
+                "connection error detected: frame size incorrect"
             );
         };
         join(conn, req).await;
@@ -329,7 +329,7 @@ async fn recv_goaway_finishes_processed_streams() {
             let err = client.get("https://example.com/").await.unwrap_err();
             assert_eq!(
                 err.to_string(),
-                "connection error received: not a result of an error"
+                "connection error received: graceful shutdown"
             );
         };