Replaced try/except block in recv_task() by match msg, and added new changes to description comment

piker/data/_web_bs.py

@@ -221,9 +221,13 @@ async def open_jsonrpc_session(
             '''
             receives every ws message and stores it in its corresponding result
             field, then sets the event to wakeup original sender tasks.
+            also, recieves responses to requests originated from the server side.
             '''
             async for msg in ws:
-                try:
+                match msg:
+                    case {
+                        'result': _
+                    }:
                         msg = response_type(**msg)
 
                         if msg.id not in rpc_results:
@@ -237,14 +241,15 @@ async def open_jsonrpc_session(
                         res['result'] = msg
                         res['event'].set()
 
-                except TypeError:
-                    if request_type == None:
-                        raise
+                    case {
+                        'method': _,
+                        'params': _
+                    }:
+
+                        if request_hook:
                             await request_hook(request_type(**msg))
 
 
-
-
         n.start_soon(recv_task)
         yield json_rpc
         n.cancel_scope.cancel()