title: Add custom headers to 'request'
body: <p>I am proxying my api via following setup in my express config</p>
  
  <pre><code>  // Proxy api calls
    app.use('/api', function (req, res) {
      let url = config.API_HOST + req.url
      req.pipe(request(url)).pipe(res)
    })
  </code></pre>
  
  <p><code>config.API_HOST</code> in here resolves to my api url and <code>req.url</code> is some endpoint i.e. <code>/users</code> I tried following documentation on npm for <a href="https://www.npmjs.com/package/request#custom-http-headers" rel="noreferrer">request</a> and set up my headers like so</p>
  
  <pre><code>  // Proxy api calls
    app.use('/api', function (req, res) {
      let options = {
        url: config.API_HOST + req.url,
        options: { 'mycustomheader': 'test' }
      }
      req.pipe(request(options)).pipe(res)
    })
  </code></pre>
  
  <p>But I am not able to see my custom headers in chrome dev tools under Network.</p>