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+# Mocking Request
+
+Undici has its own mocking [utility](../api/MockAgent.md). It allow us to intercept undici HTTP requests and return mocked values instead. It can be useful for testing purposes.
+
+Example:
+
+```js
+// bank.mjs
+import { request } from 'undici'
+
+export async function bankTransfer(recipient, amount) {
+  const { body } = await request('http://localhost:3000/bank-transfer',
+    {
+      method: 'POST',
+      headers: {
+        'X-TOKEN-SECRET': 'SuperSecretToken',
+      },
+      body: JSON.stringify({
+        recipient,
+        amount
+      })
+    }
+  )
+  return await body.json()
+}
+```
+
+And this is what the test file looks like:
+
+```js
+// index.test.mjs
+import { strict as assert } from 'assert'
+import { MockAgent, setGlobalDispatcher, } from 'undici'
+import { bankTransfer } from './bank.mjs'
+
+const mockAgent = new MockAgent();
+
+setGlobalDispatcher(mockAgent);
+
+// Provide the base url to the request
+const mockPool = mockAgent.get('http://localhost:3000');
+
+// intercept the request
+mockPool.intercept({
+  path: '/bank-transfer',
+  method: 'POST',
+  headers: {
+    'X-TOKEN-SECRET': 'SuperSecretToken',
+  },
+  body: JSON.stringify({
+    recipient: '1234567890',
+    amount: '100'
+  })
+}).reply(200, {
+  message: 'transaction processed'
+})
+
+const success = await bankTransfer('1234567890', '100')
+
+assert.deepEqual(success, { message: 'transaction processed' })
+
+// if you dont want to check whether the body or the headers contain the same value
+// just remove it from interceptor
+mockPool.intercept({
+  path: '/bank-transfer',
+  method: 'POST',
+}).reply(400, {
+  message: 'bank account not found'
+})
+
+const badRequest = await bankTransfer('1234567890', '100')
+
+assert.deepEqual(badRequest, { message: 'bank account not found' })
+```
+
+Explore other MockAgent functionality [here](../api/MockAgent.md)
+
+## Debug Mock Value
+
+When the interceptor and the request options are not the same, undici will automatically make a real HTTP request. To prevent real requests from being made, use `mockAgent.disableNetConnect()`:
+
+```js
+const mockAgent = new MockAgent();
+
+setGlobalDispatcher(mockAgent);
+mockAgent.disableNetConnect()
+
+// Provide the base url to the request
+const mockPool = mockAgent.get('http://localhost:3000');
+
+mockPool.intercept({
+  path: '/bank-transfer',
+  method: 'POST',
+}).reply(200, {
+  message: 'transaction processed'
+})
+
+const badRequest = await bankTransfer('1234567890', '100')
+// Will throw an error
+// MockNotMatchedError: Mock dispatch not matched for path '/bank-transfer':
+// subsequent request to origin http://localhost:3000 was not allowed (net.connect disabled)
+```
+
+## Reply with data based on request
+
+If the mocked response needs to be dynamically derived from the request parameters, you can provide a function instead of an object to `reply`:
+
+```js
+mockPool.intercept({
+  path: '/bank-transfer',
+  method: 'POST',
+  headers: {
+    'X-TOKEN-SECRET': 'SuperSecretToken',
+  },
+  body: JSON.stringify({
+    recipient: '1234567890',
+    amount: '100'
+  })
+}).reply(200, (opts) => {
+  // do something with opts
+
+  return { message: 'transaction processed' }
+})
+```
+
+in this case opts will be
+
+```
+{
+  method: 'POST',
+  headers: { 'X-TOKEN-SECRET': 'SuperSecretToken' },
+  body: '{"recipient":"1234567890","amount":"100"}',
+  origin: 'http://localhost:3000',
+  path: '/bank-transfer'
+}
+```