Function calculateServerName

lib/_http_agent.js:479–505

(options, req)

}

function calculateServerName(options, req) {
  let servername = options.host;
  const hostHeader = req.getHeader('host');
  if (hostHeader) {
    validateString(hostHeader, 'options.headers.host');

    // abc => abc
    // abc:123 => abc
    // [::1] => ::1
    // [::1]:123 => ::1
    if (hostHeader[0] === '[') {
      const index = hostHeader.indexOf(']');
      if (index === -1) {
        // Leading '[', but no ']'. Need to do something...
        servername = hostHeader;
      } else {
        servername = hostHeader.substring(1, index);
      }
    } else {
      servername = hostHeader.split(':', 1)[0];
    }
  }
  // Don't implicitly set invalid (IP) servernames.
  if (net.isIP(servername))
    servername = '';
  return servername;
}

function installListeners(agent, s, options) {
  function onFree() {