function parseUri(s) {
  if(typeof s === 'object')
    return s;

  var re = /^(sips?):(?:([^\s>:@]+)(?::([^\s@>]+))?@)?([\w\-\.]+)(?::(\d+))?((?:;[^\s=\?>;]+(?:=[^\s?\;]+)?)*)(?:\?(([^\s&=>]+=[^\s&=>]+)(&[^\s&=>]+=[^\s&=>]+)*))?$/;

  var r = re.exec(s);

  if(r) {
    return {
      schema: r[1],
      user: r[2],
      password: r[3],
      host: r[4],
      port: +r[5],
      params: (r[6].match(/([^;=]+)(=([^;=]+))?/g) || [])
        .map(function(s) { return s.split('='); })
        .reduce(function(params, x) { params[x[0]]=x[1] || null; return params;}, {}),
      headers: ((r[7] || '').match(/[^&=]+=[^&=]+/g) || [])
        .map(function(s){ return s.split('=') })
        .reduce(function(params, x) { params[x[0]]=x[1]; return params; }, {})
    }
  }
}