fix: error on XHR stub if response json only contains a number or boolean

Signed-off-by: mrmodise <modisemorebodi@gmail.com>

Author: mrmodise

packages/driver/cypress/fixtures/boolean.json

@@ -0,0 +1 @@
+true

packages/driver/cypress/fixtures/number.json

@@ -0,0 +1 @@
+12

packages/driver/cypress/integration/commands/xhr_spec.js

@@ -1780,6 +1780,36 @@ describe('src/cy/commands/xhr', () => {
 
         cy.contains('#result', '""').should('be.visible')
       })
+
+      it('works if the JSON file has number content', () => {
+        cy
+        .server()
+        .route({
+          method: 'POST',
+          url: '/test-xhr',
+          response: 'fixture:number.json',
+        })
+        .visit('/fixtures/xhr-triggered.html')
+        .get('#trigger-xhr')
+        .click()
+
+        cy.contains('#result', 12).should('be.visible')
+      })
+
+      it('works if the JSON file has boolean content', () => {
+        cy
+        .server()
+        .route({
+          method: 'POST',
+          url: '/test-xhr',
+          response: 'fixture:boolean.json',
+        })
+        .visit('/fixtures/xhr-triggered.html')
+        .get('#trigger-xhr')
+        .click()
+
+        cy.contains('#result', /true/).should('be.visible')
+      })
     })
 
     describe('errors', {

packages/server/lib/controllers/xhrs.js

@@ -61,6 +61,10 @@ module.exports = {
           data = ''
         }
 
+        if (_.isNumber(data) || _.isBoolean(data)) {
+          data = String(data)
+        }
+
         const chunk = Buffer.from(data, encoding)
 
         headers['content-length'] = chunk.length