feat: Support optional requests

Author: Brent Schmidt

lib/commands/index.js

@@ -179,18 +179,21 @@ const playback = {
           return;
         } else if (!isPlaybackMode('hybrid')) {
           // TODO: Improve error message.
-          Cypress.log({
-            name: 'assert',
-            displayName: 'Playback',
-            message: 'No response found for request.',
-            consoleProps: () => ({
-              'Request Url': `${req.method} ${req.url}`,
-              'Expected Response Id': id,
-            })
-          }).error();
           const message = `CYPRESS PLAYBACK: No response found for request '${req.method} ${req.url}'`;
           req.reply({ statusCode: 404, body: { message } });
-          throw new Error(message);
+          if (options.toBeCalledAtLeast !== 0) {
+            // Since the request was considered optional, don't throw an error.
+            Cypress.log({
+              name: 'assert',
+              displayName: 'Playback',
+              message: 'No response found for request.',
+              consoleProps: () => ({
+                'Request Url': `${req.method} ${req.url}`,
+                'Expected Response Id': id,
+              })
+            }).error();
+            throw new Error(message);
+          }
         }
       }