/**!
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								 * default-user-agent - index.js
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								 *
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								 * Copyright(c) fengmk2 and other contributors.
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								 * MIT Licensed
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								 *
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								 * Authors:
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								 *   fengmk2 <fengmk2@gmail.com> (http://fengmk2.com)
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								 */
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								'use strict';
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								/**
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								 * Module dependencies.
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								 */
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								var osName = require('os-name');
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								var USER_AGENT = 'Node.js/' + process.version.slice(1)
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								  + ' (' + osName() + '; ' + process.arch + ')';
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								module.exports = function ua(name, version) {
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								  if (arguments.length !== 2) {
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								    return USER_AGENT;
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								  }
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								  return name + '/' + version + ' ' + USER_AGENT;
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								};
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