H3: let client close connection gracefully

quinn-h3/src/client.rs

@@ -95,6 +95,10 @@ impl Connection {
             conn: self.0.clone(),
         }
     }
+
+    pub fn close(self, error_code: u32, reason: &[u8]) {
+        self.0.quic.close(error_code.into(), reason);
+    }
 }
 
 pub struct Connecting {

quinn-h3/src/connection.rs

@@ -33,7 +33,7 @@ impl Future for ConnectionDriver {
 
     fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
         match self.incoming.poll()? {
-            Async::Ready(None) => return Err(Error::peer("incoming requests closed")),
+            Async::Ready(None) => return Ok(Async::Ready(())),
             Async::Ready(Some(NewStream::Uni(_recv))) => {
                 info!(self.log, "incoming uni stream ignored");
             }