code: function stripConnectionHeaders(req) {
    var conn = req.getHeader("connection");
    if (typeof(conn) === 'undefined' || conn === null)
      return;
  
    conn.split(/\s+/g).forEach(function(header) {
      if (header.length === 0)
        return;
      req.removeHeader(header);
    });
    req.removeHeader("connection");
  }
docs: Per RFC 2616 section 14.10:  HTTP/1.1 proxies MUST parse the Connection header field before a message is forwarded and, for each connection-token in this field, remove any header field(s) from the message with the same name as the connection-token.