fix(server): relax authority validation for Unix domain socket compatibility

Go gRPC clients connecting over Unix domain sockets send the
URL-encoded socket path as the :authority pseudo-header (e.g.
%2Fvar%2Frun%2Fisol8%2Fcri.sock). This is rejected by
http::uri::Authority as invalid, causing RST_STREAM PROTOCOL_ERROR.

Instead of rejecting the request, log a warning and skip setting
the authority. This matches the intent of hyperium#487 which
has been open since 2020.

Author: noeljackson

src/server.rs

@@ -1660,13 +1660,18 @@ impl proto::Peer for Peer {
         // header
         if let Some(authority) = pseudo.authority {
             let maybe_authority = uri::Authority::from_maybe_shared(authority.clone().into_inner());
-            parts.authority = Some(maybe_authority.or_else(|why| {
-                malformed!(
-                    "malformed headers: malformed authority ({:?}): {}",
-                    authority,
-                    why,
-                )
-            })?);
+            match maybe_authority {
+                Ok(authority) => parts.authority = Some(authority),
+                Err(why) => {
+                    // Relaxed validation: accept requests with non-standard authority
+                    // values (e.g. Unix domain socket paths sent by Go gRPC clients).
+                    tracing::warn!(
+                        "ignoring malformed authority ({:?}): {}",
+                        authority,
+                        why,
+                    );
+                }
+            }
         }
 
         // A :scheme is required, except CONNECT.