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'use strict';

var Headers = function() {
  this.clear();
};

Headers.prototype.ALLOWED_DUPLICATES = ['set-cookie', 'set-cookie2', 'warning', 'www-authenticate'];

Headers.prototype.clear = function() {
  this._sent  = {};
  this._lines = [];
};

Headers.prototype.set = function(name, value) {
  if (value === undefined) return;

  name = this._strip(name);
  value = this._strip(value);

  var key = name.toLowerCase();
  if (!this._sent.hasOwnProperty(key) || this.ALLOWED_DUPLICATES.indexOf(key) >= 0) {
    this._sent[key] = true;
    this._lines.push(name + ': ' + value + '\r\n');
  }
};

Headers.prototype.toString = function() {
  return this._lines.join('');
};

Headers.prototype._strip = function(string) {
  return string.toString().replace(/^ */, '').replace(/ *$/, '');
};

module.exports = Headers;