code: function serverFromPathname( pathname ) {
    var hash = crc32(pathname);
    var rng = seed(hash);
    var server = 'i' + Math.floor(rng() * 3);
    debug('determined server "%s" to use with "%s"', server, pathname);
    return server + '.wp.com';
  }
docs: Determine which Photon server to connect to: `i0`, `i1`, or `i2`.
  
  Statically hash the subdomain based on the URL, to optimize browser caches.
  @param  {string} pathname The pathname to use
  @return {string}          The hostname for the pathname