Do not always require an authority

This fixes connections where no authority is provide, for example when
using UNIX domain sockets.

Signed-off-by: Sascha Grunert <sgrunert@suse.com>

src/server.rs

@@ -1393,14 +1393,8 @@ impl proto::Peer for Peer {
         // A request translated from HTTP/1 must not include the :authority
         // 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,
-                )
-            })?);
+            parts.authority =
+                uri::Authority::from_maybe_shared(authority.clone().into_inner()).ok();
         }
 
         // A :scheme is required, except CONNECT.