From 63be4ecb791ef36baa4656f6c88b125b2b8d9024 Mon Sep 17 00:00:00 2001
From: Joshua Blum <joshua.blum@zoom.us>
Date: Mon, 2 Nov 2026 15:00:45 -0500
Subject: [PATCH] drop cancel messages instead of emitting warnings

---
 lib/dispatch.js   | 7 ++++++-
 src/dispatch.iced | 6 +++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/dispatch.js b/lib/dispatch.js
index 166556b..b58f8f7 100644
--- a/lib/dispatch.js
+++ b/lib/dispatch.js
@@ -100,6 +100,8 @@
 
     Dispatch.prototype.NOTIFY = 2;
 
+    Dispatch.prototype.CANCEL = 3;
+
     Dispatch.prototype.INVOKE_COMPRESSED = 4;
 
     function Dispatch() {
@@ -155,6 +157,9 @@
               param: param,
               response: response
             });
+          case this.CANCEL:
+            seqid = msg[0], method = msg[1];
+            break;
           default:
             return this._warn("Unknown message type: " + type);
         }
@@ -269,7 +274,7 @@
                     return result = arguments[1];
                   };
                 })(),
-                lineno: 191
+                lineno: 195
               });
               __iced_deferrals._fulfill();
             })(function() {
diff --git a/src/dispatch.iced b/src/dispatch.iced
index d825c07..778dacd 100644
--- a/src/dispatch.iced
+++ b/src/dispatch.iced
@@ -62,7 +62,7 @@ exports.Dispatch = class Dispatch extends Packetizer
   INVOKE : 0
   RESPONSE : 1
   NOTIFY   : 2
-  # CANCEL : 3, not implemented
+  CANCEL : 3
   INVOKE_COMPRESSED : 4
 
   ##-----------------------------------------
@@ -104,6 +104,10 @@ exports.Dispatch = class Dispatch extends Packetizer
           param = uncompress ctype, param
           response = new Response @, seqid, ctype
           @_serve { method, param, response }
+        when @CANCEL
+          # Server-side cancellation is not implemented; parse and drop the message.
+          [seqid,method] = msg
+          return
         else
           @_warn "Unknown message type: #{type}"