title: Determining which HTTP headers to forward from nginx to node.js
body: <p>In this answer</p>
  
  <p><a href="https://stackoverflow.com/a/5015178/2308693">https://stackoverflow.com/a/5015178/2308693</a></p>
  
  <p>the user Joao Da Silva showed what HTTP headers he forwards from nginx to Node.js.</p>
  
  <p>How do you know what headers Node.js needs?</p>
  
  <p>Are there any standards in the protocols about what headers are <strong>required</strong>, <strong>recommended</strong>, <strong>optional</strong> etc.?</p>