'use strict';
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var Headers = function() {
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this.clear();
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};
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Headers.prototype.ALLOWED_DUPLICATES = ['set-cookie', 'set-cookie2', 'warning', 'www-authenticate'];
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Headers.prototype.clear = function() {
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this._sent = {};
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this._lines = [];
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};
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Headers.prototype.set = function(name, value) {
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if (value === undefined) return;
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name = this._strip(name);
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value = this._strip(value);
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var key = name.toLowerCase();
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if (!this._sent.hasOwnProperty(key) || this.ALLOWED_DUPLICATES.indexOf(key) >= 0) {
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this._sent[key] = true;
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this._lines.push(name + ': ' + value + '\r\n');
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}
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};
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Headers.prototype.toString = function() {
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return this._lines.join('');
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};
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Headers.prototype._strip = function(string) {
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return string.toString().replace(/^ */, '').replace(/ *$/, '');
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};
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module.exports = Headers;
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