Mention pool usage

Author: delvedor

docs/proxy.md

@@ -1,8 +1,8 @@
 # Connecting through a proxy
 
-Conneting through a proxy is possible by properly configuring the client constructor and request.
+Conneting through a proxy is possible by properly configuring the `Client` or `Pool` constructor and request.
 
-The proxy url should be passed to the client constructor, while the upstream server url
+The proxy url should be passed to the `Client` or `Pool` constructor, while the upstream server url
 should be added to every request call in the `path`.
 For instance, if you need to send a request to the `/hello` route of your upstream server,
 the `path` should be `path: 'http://upstream.server:port/hello?foo=bar'`.
@@ -14,7 +14,7 @@ If you proxy requires basic authentication, you can send it via the `proxy-autho
 ```js
 import { Client } from 'undici'
 import { createServer } from 'http'
-import proxy = from 'proxy'
+import proxy from 'proxy'
 
 const server = await buildServer()
 const proxy = await buildProxy()
@@ -67,7 +67,7 @@ function buildProxy () {
 ```js
 import { Client } from 'undici'
 import { createServer } from 'http'
-import proxy = from 'proxy'
+import proxy from 'proxy'
 
 const server = await buildServer()
 const proxy = await buildProxy()

test/proxy.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const { test } = require('tap')
-const { Client } = require('..')
+const { Client, Pool } = require('..')
 const { createServer } = require('http')
 const proxy = require('proxy')
 
@@ -82,6 +82,41 @@ test('connect through proxy with auth', async (t) => {
   client.close()
 })
 
+test('connect through proxy (with pool)', async (t) => {
+  t.plan(3)
+
+  const server = await buildServer()
+  const proxy = await buildProxy()
+
+  const serverUrl = `http://localhost:${server.address().port}`
+  const proxyUrl = `http://localhost:${proxy.address().port}`
+
+  server.on('request', (req, res) => {
+    t.strictEqual(req.url, '/hello?foo=bar')
+    res.setHeader('content-type', 'application/json')
+    res.end(JSON.stringify({ hello: 'world' }))
+  })
+
+  const pool = new Pool(proxyUrl)
+
+  const response = await pool.request({
+    method: 'GET',
+    path: serverUrl + '/hello?foo=bar'
+  })
+
+  response.body.setEncoding('utf8')
+  let data = ''
+  for await (const chunk of response.body) {
+    data += chunk
+  }
+  t.strictEqual(response.statusCode, 200)
+  t.deepEqual(JSON.parse(data), { hello: 'world' })
+
+  server.close()
+  proxy.close()
+  pool.close()
+})
+
 function buildServer () {
   return new Promise((resolve, reject) => {
     const server = createServer()