Notify RingRTC of Failed HTTP requests

ts/services/calling.ts

@@ -1219,8 +1219,15 @@ export class CallingClass {
         body
       );
     } catch (err) {
+      if (err.code !== -1) {
+        // WebAPI treats certain response codes as errors, but RingRTC still needs to
+        // see them. It does not currently look at the response body, so we're giving
+        // it an empty one.
+        RingRTC.receivedHttpResponse(requestId, err.code, new ArrayBuffer(0));
+      } else {
         window.log.error('handleSendHttpRequest: fetch failed with error', err);
         RingRTC.httpRequestFailed(requestId, String(err));
+      }
       return;
     }