get current schema from request

tidusvn05

The getCurrentSchemeFromRequestHeader() function returns the scheme from the request header 'HTTP_X_FORWARDED_SCHEME'. If the header is not set or if the header value is not a valid scheme, the function returns 'http'.

Shortcut: url.schema


/**
* @return string eg: http https
*/
function getCurrentSchemeFromRequestHeader()
{
  if (isset($_SERVER['HTTP_X_FORWARDED_SCHEME']) && strtolower($_SERVER['HTTP_X_FORWARDED_SCHEME']) === 'https') {
    return 'https';
  }

  if (isset($_SERVER['HTTP_X_URL_SCHEME']) && strtolower($_SERVER['HTTP_X_URL_SCHEME']) === 'https') {
    return 'https';
  }

  if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'http') {
    return 'http';
  }

  if (
    (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] === true))
    || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
  ) {
    return 'https';
  }
  return 'http';
}