auth0-js/dist/auth0.js

Auth0 headless browser sdk

/**
 * auth0-js v9.7.3
 * Author: Auth0
 * Date: 2018-07-23
 * License: MIT
 */

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.auth0 = {})));
}(this, (function (exports) { 'use strict';

	var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

	function createCommonjsModule(fn, module) {
		return module = { exports: {} }, fn(module, module.exports), module.exports;
	}

	var urlJoin = createCommonjsModule(function (module) {
	(function (name, context, definition) {
	  if (module.exports) module.exports = definition();
	  else if (typeof undefined === 'function' && undefined.amd) undefined(definition);
	  else context[name] = definition();
	})('urljoin', commonjsGlobal, function () {

	  function normalize (str, options) {

	    // make sure protocol is followed by two slashes
	    str = str.replace(/:\//g, '://');

	    // remove consecutive slashes
	    str = str.replace(/([^:\s])\/+/g, '$1/');

	    // remove trailing slash before parameters or hash
	    str = str.replace(/\/(\?|&|#[^!])/g, '$1');

	    // replace ? in parameters with &
	    str = str.replace(/(\?.+)\?/g, '$1&');

	    return str;
	  }

	  return function () {
	    var input = arguments;
	    var options = {};

	    if (typeof arguments[0] === 'object') {
	      // new syntax with array and options
	      input = arguments[0];
	      options = arguments[1] || {};
	    }

	    var joined = [].slice.call(input, 0).join('/');
	    return normalize(joined, options);
	  };

	});
	});

	var utils = createCommonjsModule(function (module, exports) {

	var has = Object.prototype.hasOwnProperty;

	var hexTable = (function () {
	    var array = [];
	    for (var i = 0; i < 256; ++i) {
	        array.push('%' + ((i < 16 ? '0' : '') + i.toString(16)).toUpperCase());
	    }

	    return array;
	}());

	exports.arrayToObject = function (source, options) {
	    var obj = options && options.plainObjects ? Object.create(null) : {};
	    for (var i = 0; i < source.length; ++i) {
	        if (typeof source[i] !== 'undefined') {
	            obj[i] = source[i];
	        }
	    }

	    return obj;
	};

	exports.merge = function (target, source, options) {
	    if (!source) {
	        return target;
	    }

	    if (typeof source !== 'object') {
	        if (Array.isArray(target)) {
	            target.push(source);
	        } else if (typeof target === 'object') {
	            if (options.plainObjects || options.allowPrototypes || !has.call(Object.prototype, source)) {
	                target[source] = true;
	            }
	        } else {
	            return [target, source];
	        }

	        return target;
	    }

	    if (typeof target !== 'object') {
	        return [target].concat(source);
	    }

	    var mergeTarget = target;
	    if (Array.isArray(target) && !Array.isArray(source)) {
	        mergeTarget = exports.arrayToObject(target, options);
	    }

	    if (Array.isArray(target) && Array.isArray(source)) {
	        source.forEach(function (item, i) {
	            if (has.call(target, i)) {
	                if (target[i] && typeof target[i] === 'object') {
	                    target[i] = exports.merge(target[i], item, options);
	                } else {
	                    target.push(item);
	                }
	            } else {
	                target[i] = item;
	            }
	        });
	        return target;
	    }

	    return Object.keys(source).reduce(function (acc, key) {
	        var value = source[key];

	        if (Object.prototype.hasOwnProperty.call(acc, key)) {
	            acc[key] = exports.merge(acc[key], value, options);
	        } else {
	            acc[key] = value;
	        }
	        return acc;
	    }, mergeTarget);
	};

	exports.decode = function (str) {
	    try {
	        return decodeURIComponent(str.replace(/\+/g, ' '));
	    } catch (e) {
	        return str;
	    }
	};

	exports.encode = function (str) {
	    // This code was originally written by Brian White (mscdex) for the io.js core querystring library.
	    // It has been adapted here for stricter adherence to RFC 3986
	    if (str.length === 0) {
	        return str;
	    }

	    var string = typeof str === 'string' ? str : String(str);

	    var out = '';
	    for (var i = 0; i < string.length; ++i) {
	        var c = string.charCodeAt(i);

	        if (
	            c === 0x2D || // -
	            c === 0x2E || // .
	            c === 0x5F || // _
	            c === 0x7E || // ~
	            (c >= 0x30 && c <= 0x39) || // 0-9
	            (c >= 0x41 && c <= 0x5A) || // a-z
	            (c >= 0x61 && c <= 0x7A) // A-Z
	        ) {
	            out += string.charAt(i);
	            continue;
	        }

	        if (c < 0x80) {
	            out = out + hexTable[c];
	            continue;
	        }

	        if (c < 0x800) {
	            out = out + (hexTable[0xC0 | (c >> 6)] + hexTable[0x80 | (c & 0x3F)]);
	            continue;
	        }

	        if (c < 0xD800 || c >= 0xE000) {
	            out = out + (hexTable[0xE0 | (c >> 12)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]);
	            continue;
	        }

	        i += 1;
	        c = 0x10000 + (((c & 0x3FF) << 10) | (string.charCodeAt(i) & 0x3FF));
	        out += hexTable[0xF0 | (c >> 18)] + hexTable[0x80 | ((c >> 12) & 0x3F)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]; // eslint-disable-line max-len
	    }

	    return out;
	};

	exports.compact = function (obj, references) {
	    if (typeof obj !== 'object' || obj === null) {
	        return obj;
	    }

	    var refs = references || [];
	    var lookup = refs.indexOf(obj);
	    if (lookup !== -1) {
	        return refs[lookup];
	    }

	    refs.push(obj);

	    if (Array.isArray(obj)) {
	        var compacted = [];

	        for (var i = 0; i < obj.length; ++i) {
	            if (obj[i] && typeof obj[i] === 'object') {
	                compacted.push(exports.compact(obj[i], refs));
	            } else if (typeof obj[i] !== 'undefined') {
	                compacted.push(obj[i]);
	            }
	        }

	        return compacted;
	    }

	    var keys = Object.keys(obj);
	    keys.forEach(function (key) {
	        obj[key] = exports.compact(obj[key], refs);
	    });

	    return obj;
	};

	exports.isRegExp = function (obj) {
	    return Object.prototype.toString.call(obj) === '[object RegExp]';
	};

	exports.isBuffer = function (obj) {
	    if (obj === null || typeof obj === 'undefined') {
	        return false;
	    }

	    return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj));
	};
	});
	var utils_1 = utils.arrayToObject;
	var utils_2 = utils.merge;
	var utils_3 = utils.decode;
	var utils_4 = utils.encode;
	var utils_5 = utils.compact;
	var utils_6 = utils.isRegExp;
	var utils_7 = utils.isBuffer;

	var replace = String.prototype.replace;
	var percentTwenties = /%20/g;

	var formats = {
	    'default': 'RFC3986',
	    formatters: {
	        RFC1738: function (value) {
	            return replace.call(value, percentTwenties, '+');
	        },
	        RFC3986: function (value) {
	            return value;
	        }
	    },
	    RFC1738: 'RFC1738',
	    RFC3986: 'RFC3986'
	};

	var arrayPrefixGenerators = {
	    brackets: function brackets(prefix) { // eslint-disable-line func-name-matching
	        return prefix + '[]';
	    },
	    indices: function indices(prefix, key) { // eslint-disable-line func-name-matching
	        return prefix + '[' + key + ']';
	    },
	    repeat: function repeat(prefix) { // eslint-disable-line func-name-matching
	        return prefix;
	    }
	};

	var toISO = Date.prototype.toISOString;

	var defaults = {
	    delimiter: '&',
	    encode: true,
	    encoder: utils.encode,
	    encodeValuesOnly: false,
	    serializeDate: function serializeDate(date) { // eslint-disable-line func-name-matching
	        return toISO.call(date);
	    },
	    skipNulls: false,
	    strictNullHandling: false
	};

	var stringify = function stringify( // eslint-disable-line func-name-matching
	    object,
	    prefix,
	    generateArrayPrefix,
	    strictNullHandling,
	    skipNulls,
	    encoder,
	    filter,
	    sort,
	    allowDots,
	    serializeDate,
	    formatter,
	    encodeValuesOnly
	) {
	    var obj = object;
	    if (typeof filter === 'function') {
	        obj = filter(prefix, obj);
	    } else if (obj instanceof Date) {
	        obj = serializeDate(obj);
	    } else if (obj === null) {
	        if (strictNullHandling) {
	            return encoder && !encodeValuesOnly ? encoder(prefix) : prefix;
	        }

	        obj = '';
	    }

	    if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean' || utils.isBuffer(obj)) {
	        if (encoder) {
	            var keyValue = encodeValuesOnly ? prefix : encoder(prefix);
	            return [formatter(keyValue) + '=' + formatter(encoder(obj))];
	        }
	        return [formatter(prefix) + '=' + formatter(String(obj))];
	    }

	    var values = [];

	    if (typeof obj === 'undefined') {
	        return values;
	    }

	    var objKeys;
	    if (Array.isArray(filter)) {
	        objKeys = filter;
	    } else {
	        var keys = Object.keys(obj);
	        objKeys = sort ? keys.sort(sort) : keys;
	    }

	    for (var i = 0; i < objKeys.length; ++i) {
	        var key = objKeys[i];

	        if (skipNulls && obj[key] === null) {
	            continue;
	        }

	        if (Array.isArray(obj)) {
	            values = values.concat(stringify(
	                obj[key],
	                generateArrayPrefix(prefix, key),
	                generateArrayPrefix,
	                strictNullHandling,
	                skipNulls,
	                encoder,
	                filter,
	                sort,
	                allowDots,
	                serializeDate,
	                formatter,
	                encodeValuesOnly
	            ));
	        } else {
	            values = values.concat(stringify(
	                obj[key],
	                prefix + (allowDots ? '.' + key : '[' + key + ']'),
	                generateArrayPrefix,
	                strictNullHandling,
	                skipNulls,
	                encoder,
	                filter,
	                sort,
	                allowDots,
	                serializeDate,
	                formatter,
	                encodeValuesOnly
	            ));
	        }
	    }

	    return values;
	};

	var stringify_1 = function (object, opts) {
	    var obj = object;
	    var options = opts || {};

	    if (options.encoder !== null && options.encoder !== undefined && typeof options.encoder !== 'function') {
	        throw new TypeError('Encoder has to be a function.');
	    }

	    var delimiter = typeof options.delimiter === 'undefined' ? defaults.delimiter : options.delimiter;
	    var strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : defaults.strictNullHandling;
	    var skipNulls = typeof options.skipNulls === 'boolean' ? options.skipNulls : defaults.skipNulls;
	    var encode = typeof options.encode === 'boolean' ? options.encode : defaults.encode;
	    var encoder = typeof options.encoder === 'function' ? options.encoder : defaults.encoder;
	    var sort = typeof options.sort === 'function' ? options.sort : null;
	    var allowDots = typeof options.allowDots === 'undefined' ? false : options.allowDots;
	    var serializeDate = typeof options.serializeDate === 'function' ? options.serializeDate : defaults.serializeDate;
	    var encodeValuesOnly = typeof options.encodeValuesOnly === 'boolean' ? options.encodeValuesOnly : defaults.encodeValuesOnly;
	    if (typeof options.format === 'undefined') {
	        options.format = formats.default;
	    } else if (!Object.prototype.hasOwnProperty.call(formats.formatters, options.format)) {
	        throw new TypeError('Unknown format option provided.');
	    }
	    var formatter = formats.formatters[options.format];
	    var objKeys;
	    var filter;

	    if (typeof options.filter === 'function') {
	        filter = options.filter;
	        obj = filter('', obj);
	    } else if (Array.isArray(options.filter)) {
	        filter = options.filter;
	        objKeys = filter;
	    }

	    var keys = [];

	    if (typeof obj !== 'object' || obj === null) {
	        return '';
	    }

	    var arrayFormat;
	    if (options.arrayFormat in arrayPrefixGenerators) {
	        arrayFormat = options.arrayFormat;
	    } else if ('indices' in options) {
	        arrayFormat = options.indices ? 'indices' : 'repeat';
	    } else {
	        arrayFormat = 'indices';
	    }

	    var generateArrayPrefix = arrayPrefixGenerators[arrayFormat];

	    if (!objKeys) {
	        objKeys = Object.keys(obj);
	    }

	    if (sort) {
	        objKeys.sort(sort);
	    }

	    for (var i = 0; i < objKeys.length; ++i) {
	        var key = objKeys[i];

	        if (skipNulls && obj[key] === null) {
	            continue;
	        }

	        keys = keys.concat(stringify(
	            obj[key],
	            key,
	            generateArrayPrefix,
	            strictNullHandling,
	            skipNulls,
	            encode ? encoder : null,
	            filter,
	            sort,
	            allowDots,
	            serializeDate,
	            formatter,
	            encodeValuesOnly
	        ));
	    }

	    return keys.join(delimiter);
	};

	var has = Object.prototype.hasOwnProperty;

	var defaults$1 = {
	    allowDots: false,
	    allowPrototypes: false,
	    arrayLimit: 20,
	    decoder: utils.decode,
	    delimiter: '&',
	    depth: 5,
	    parameterLimit: 1000,
	    plainObjects: false,
	    strictNullHandling: false
	};

	var parseValues = function parseQueryStringValues(str, options) {
	    var obj = {};
	    var parts = str.split(options.delimiter, options.parameterLimit === Infinity ? undefined : options.parameterLimit);

	    for (var i = 0; i < parts.length; ++i) {
	        var part = parts[i];
	        var pos = part.indexOf(']=') === -1 ? part.indexOf('=') : part.indexOf(']=') + 1;

	        var key, val;
	        if (pos === -1) {
	            key = options.decoder(part);
	            val = options.strictNullHandling ? null : '';
	        } else {
	            key = options.decoder(part.slice(0, pos));
	            val = options.decoder(part.slice(pos + 1));
	        }
	        if (has.call(obj, key)) {
	            obj[key] = [].concat(obj[key]).concat(val);
	        } else {
	            obj[key] = val;
	        }
	    }

	    return obj;
	};

	var parseObject = function parseObjectRecursive(chain, val, options) {
	    if (!chain.length) {
	        return val;
	    }

	    var root = chain.shift();

	    var obj;
	    if (root === '[]') {
	        obj = [];
	        obj = obj.concat(parseObject(chain, val, options));
	    } else {
	        obj = options.plainObjects ? Object.create(null) : {};
	        var cleanRoot = root.charAt(0) === '[' && root.charAt(root.length - 1) === ']' ? root.slice(1, -1) : root;
	        var index = parseInt(cleanRoot, 10);
	        if (
	            !isNaN(index) &&
	            root !== cleanRoot &&
	            String(index) === cleanRoot &&
	            index >= 0 &&
	            (options.parseArrays && index <= options.arrayLimit)
	        ) {
	            obj = [];
	            obj[index] = parseObject(chain, val, options);
	        } else {
	            obj[cleanRoot] = parseObject(chain, val, options);
	        }
	    }

	    return obj;
	};

	var parseKeys = function parseQueryStringKeys(givenKey, val, options) {
	    if (!givenKey) {
	        return;
	    }

	    // Transform dot notation to bracket notation
	    var key = options.allowDots ? givenKey.replace(/\.([^.[]+)/g, '[$1]') : givenKey;

	    // The regex chunks

	    var brackets = /(\[[^[\]]*])/;
	    var child = /(\[[^[\]]*])/g;

	    // Get the parent

	    var segment = brackets.exec(key);
	    var parent = segment ? key.slice(0, segment.index) : key;

	    // Stash the parent if it exists

	    var keys = [];
	    if (parent) {
	        // If we aren't using plain objects, optionally prefix keys
	        // that would overwrite object prototype properties
	        if (!options.plainObjects && has.call(Object.prototype, parent)) {
	            if (!options.allowPrototypes) {
	                return;
	            }
	        }

	        keys.push(parent);
	    }

	    // Loop through children appending to the array until we hit depth

	    var i = 0;
	    while ((segment = child.exec(key)) !== null && i < options.depth) {
	        i += 1;
	        if (!options.plainObjects && has.call(Object.prototype, segment[1].slice(1, -1))) {
	            if (!options.allowPrototypes) {
	                return;
	            }
	        }
	        keys.push(segment[1]);
	    }

	    // If there's a remainder, just add whatever is left

	    if (segment) {
	        keys.push('[' + key.slice(segment.index) + ']');
	    }

	    return parseObject(keys, val, options);
	};

	var parse = function (str, opts) {
	    var options = opts || {};

	    if (options.decoder !== null && options.decoder !== undefined && typeof options.decoder !== 'function') {
	        throw new TypeError('Decoder has to be a function.');
	    }

	    options.delimiter = typeof options.delimiter === 'string' || utils.isRegExp(options.delimiter) ? options.delimiter : defaults$1.delimiter;
	    options.depth = typeof options.depth === 'number' ? options.depth : defaults$1.depth;
	    options.arrayLimit = typeof options.arrayLimit === 'number' ? options.arrayLimit : defaults$1.arrayLimit;
	    options.parseArrays = options.parseArrays !== false;
	    options.decoder = typeof options.decoder === 'function' ? options.decoder : defaults$1.decoder;
	    options.allowDots = typeof options.allowDots === 'boolean' ? options.allowDots : defaults$1.allowDots;
	    options.plainObjects = typeof options.plainObjects === 'boolean' ? options.plainObjects : defaults$1.plainObjects;
	    options.allowPrototypes = typeof options.allowPrototypes === 'boolean' ? options.allowPrototypes : defaults$1.allowPrototypes;
	    options.parameterLimit = typeof options.parameterLimit === 'number' ? options.parameterLimit : defaults$1.parameterLimit;
	    options.strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : defaults$1.strictNullHandling;

	    if (str === '' || str === null || typeof str === 'undefined') {
	        return options.plainObjects ? Object.create(null) : {};
	    }

	    var tempObj = typeof str === 'string' ? parseValues(str, options) : str;
	    var obj = options.plainObjects ? Object.create(null) : {};

	    // Iterate over the keys and setup the new object

	    var keys = Object.keys(tempObj);
	    for (var i = 0; i < keys.length; ++i) {
	        var key = keys[i];
	        var newObj = parseKeys(key, tempObj[key], options);
	        obj = utils.merge(obj, newObj, options);
	    }

	    return utils.compact(obj);
	};

	var lib = {
	    formats: formats,
	    parse: parse,
	    stringify: stringify_1
	};

	var componentEmitter = createCommonjsModule(function (module) {
	/**
	 * Expose `Emitter`.
	 */

	{
	  module.exports = Emitter;
	}

	/**
	 * Initialize a new `Emitter`.
	 *
	 * @api public
	 */

	function Emitter(obj) {
	  if (obj) return mixin(obj);
	}
	/**
	 * Mixin the emitter properties.
	 *
	 * @param {Object} obj
	 * @return {Object}
	 * @api private
	 */

	function mixin(obj) {
	  for (var key in Emitter.prototype) {
	    obj[key] = Emitter.prototype[key];
	  }
	  return obj;
	}

	/**
	 * Listen on the given `event` with `fn`.
	 *
	 * @param {String} event
	 * @param {Function} fn
	 * @return {Emitter}
	 * @api public
	 */

	Emitter.prototype.on =
	Emitter.prototype.addEventListener = function(event, fn){
	  this._callbacks = this._callbacks || {};
	  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])
	    .push(fn);
	  return this;
	};

	/**
	 * Adds an `event` listener that will be invoked a single
	 * time then automatically removed.
	 *
	 * @param {String} event
	 * @param {Function} fn
	 * @return {Emitter}
	 * @api public
	 */

	Emitter.prototype.once = function(event, fn){
	  function on() {
	    this.off(event, on);
	    fn.apply(this, arguments);
	  }

	  on.fn = fn;
	  this.on(event, on);
	  return this;
	};

	/**
	 * Remove the given callback for `event` or all
	 * registered callbacks.
	 *
	 * @param {String} event
	 * @param {Function} fn
	 * @return {Emitter}
	 * @api public
	 */

	Emitter.prototype.off =
	Emitter.prototype.removeListener =
	Emitter.prototype.removeAllListeners =
	Emitter.prototype.removeEventListener = function(event, fn){
	  this._callbacks = this._callbacks || {};

	  // all
	  if (0 == arguments.length) {
	    this._callbacks = {};
	    return this;
	  }

	  // specific event
	  var callbacks = this._callbacks['$' + event];
	  if (!callbacks) return this;

	  // remove all handlers
	  if (1 == arguments.length) {
	    delete this._callbacks['$' + event];
	    return this;
	  }

	  // remove specific handler
	  var cb;
	  for (var i = 0; i < callbacks.length; i++) {
	    cb = callbacks[i];
	    if (cb === fn || cb.fn === fn) {
	      callbacks.splice(i, 1);
	      break;
	    }
	  }
	  return this;
	};

	/**
	 * Emit `event` with the given args.
	 *
	 * @param {String} event
	 * @param {Mixed} ...
	 * @return {Emitter}
	 */

	Emitter.prototype.emit = function(event){
	  this._callbacks = this._callbacks || {};
	  var args = [].slice.call(arguments, 1)
	    , callbacks = this._callbacks['$' + event];

	  if (callbacks) {
	    callbacks = callbacks.slice(0);
	    for (var i = 0, len = callbacks.length; i < len; ++i) {
	      callbacks[i].apply(this, args);
	    }
	  }

	  return this;
	};

	/**
	 * Return array of callbacks for `event`.
	 *
	 * @param {String} event
	 * @return {Array}
	 * @api public
	 */

	Emitter.prototype.listeners = function(event){
	  this._callbacks = this._callbacks || {};
	  return this._callbacks['$' + event] || [];
	};

	/**
	 * Check if this emitter has `event` handlers.
	 *
	 * @param {String} event
	 * @return {Boolean}
	 * @api public
	 */

	Emitter.prototype.hasListeners = function(event){
	  return !! this.listeners(event).length;
	};
	});

	/**
	 * Check if `obj` is an object.
	 *
	 * @param {Object} obj
	 * @return {Boolean}
	 * @api private
	 */

	function isObject(obj) {
	  return null !== obj && 'object' === typeof obj;
	}

	var isObject_1 = isObject;

	/**
	 * Module of mixed-in functions shared between node and client code
	 */


	/**
	 * Expose `RequestBase`.
	 */

	var requestBase = RequestBase;

	/**
	 * Initialize a new `RequestBase`.
	 *
	 * @api public
	 */

	function RequestBase(obj) {
	  if (obj) return mixin(obj);
	}

	/**
	 * Mixin the prototype properties.
	 *
	 * @param {Object} obj
	 * @return {Object}
	 * @api private
	 */

	function mixin(obj) {
	  for (var key in RequestBase.prototype) {
	    obj[key] = RequestBase.prototype[key];
	  }
	  return obj;
	}

	/**
	 * Clear previous timeout.
	 *
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.clearTimeout = function _clearTimeout(){
	  clearTimeout(this._timer);
	  clearTimeout(this._responseTimeoutTimer);
	  delete this._timer;
	  delete this._responseTimeoutTimer;
	  return this;
	};

	/**
	 * Override default response body parser
	 *
	 * This function will be called to convert incoming data into request.body
	 *
	 * @param {Function}
	 * @api public
	 */

	RequestBase.prototype.parse = function parse(fn){
	  this._parser = fn;
	  return this;
	};

	/**
	 * Set format of binary response body.
	 * In browser valid formats are 'blob' and 'arraybuffer',
	 * which return Blob and ArrayBuffer, respectively.
	 *
	 * In Node all values result in Buffer.
	 *
	 * Examples:
	 *
	 *      req.get('/')
	 *        .responseType('blob')
	 *        .end(callback);
	 *
	 * @param {String} val
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.responseType = function(val){
	  this._responseType = val;
	  return this;
	};

	/**
	 * Override default request body serializer
	 *
	 * This function will be called to convert data set via .send or .attach into payload to send
	 *
	 * @param {Function}
	 * @api public
	 */

	RequestBase.prototype.serialize = function serialize(fn){
	  this._serializer = fn;
	  return this;
	};

	/**
	 * Set timeouts.
	 *
	 * - response timeout is time between sending request and receiving the first byte of the response. Includes DNS and connection time.
	 * - deadline is the time from start of the request to receiving response body in full. If the deadline is too short large files may not load at all on slow connections.
	 *
	 * Value of 0 or false means no timeout.
	 *
	 * @param {Number|Object} ms or {response, deadline}
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.timeout = function timeout(options){
	  if (!options || 'object' !== typeof options) {
	    this._timeout = options;
	    this._responseTimeout = 0;
	    return this;
	  }

	  for(var option in options) {
	    switch(option) {
	      case 'deadline':
	        this._timeout = options.deadline;
	        break;
	      case 'response':
	        this._responseTimeout = options.response;
	        break;
	      default:
	        console.warn("Unknown timeout option", option);
	    }
	  }
	  return this;
	};

	/**
	 * Set number of retry attempts on error.
	 *
	 * Failed requests will be retried 'count' times if timeout or err.code >= 500.
	 *
	 * @param {Number} count
	 * @param {Function} [fn]
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.retry = function retry(count, fn){
	  // Default to 1 if no count passed or true
	  if (arguments.length === 0 || count === true) count = 1;
	  if (count <= 0) count = 0;
	  this._maxRetries = count;
	  this._retries = 0;
	  this._retryCallback = fn;
	  return this;
	};

	var ERROR_CODES = [
	  'ECONNRESET',
	  'ETIMEDOUT',
	  'EADDRINFO',
	  'ESOCKETTIMEDOUT'
	];

	/**
	 * Determine if a request should be retried.
	 * (Borrowed from segmentio/superagent-retry)
	 *
	 * @param {Error} err
	 * @param {Response} [res]
	 * @returns {Boolean}
	 */
	RequestBase.prototype._shouldRetry = function(err, res) {
	  if (!this._maxRetries || this._retries++ >= this._maxRetries) {
	    return false;
	  }
	  if (this._retryCallback) {
	    try {
	      var override = this._retryCallback(err, res);
	      if (override === true) return true;
	      if (override === false) return false;
	      // undefined falls back to defaults
	    } catch(e) {
	      console.error(e);
	    }
	  }
	  if (res && res.status && res.status >= 500 && res.status != 501) return true;
	  if (err) {
	    if (err.code && ~ERROR_CODES.indexOf(err.code)) return true;
	    // Superagent timeout
	    if (err.timeout && err.code == 'ECONNABORTED') return true;
	    if (err.crossDomain) return true;
	  }
	  return false;
	};

	/**
	 * Retry request
	 *
	 * @return {Request} for chaining
	 * @api private
	 */

	RequestBase.prototype._retry = function() {

	  this.clearTimeout();

	  // node
	  if (this.req) {
	    this.req = null;
	    this.req = this.request();
	  }

	  this._aborted = false;
	  this.timedout = false;

	  return this._end();
	};

	/**
	 * Promise support
	 *
	 * @param {Function} resolve
	 * @param {Function} [reject]
	 * @return {Request}
	 */

	RequestBase.prototype.then = function then(resolve, reject) {
	  if (!this._fullfilledPromise) {
	    var self = this;
	    if (this._endCalled) {
	      console.warn("Warning: superagent request was sent twice, because both .end() and .then() were called. Never call .end() if you use promises");
	    }
	    this._fullfilledPromise = new Promise(function(innerResolve, innerReject) {
	      self.end(function(err, res) {
	        if (err) innerReject(err);
	        else innerResolve(res);
	      });
	    });
	  }
	  return this._fullfilledPromise.then(resolve, reject);
	};

	RequestBase.prototype.catch = function(cb) {
	  return this.then(undefined, cb);
	};

	/**
	 * Allow for extension
	 */

	RequestBase.prototype.use = function use(fn) {
	  fn(this);
	  return this;
	};

	RequestBase.prototype.ok = function(cb) {
	  if ('function' !== typeof cb) throw Error("Callback required");
	  this._okCallback = cb;
	  return this;
	};

	RequestBase.prototype._isResponseOK = function(res) {
	  if (!res) {
	    return false;
	  }

	  if (this._okCallback) {
	    return this._okCallback(res);
	  }

	  return res.status >= 200 && res.status < 300;
	};

	/**
	 * Get request header `field`.
	 * Case-insensitive.
	 *
	 * @param {String} field
	 * @return {String}
	 * @api public
	 */

	RequestBase.prototype.get = function(field){
	  return this._header[field.toLowerCase()];
	};

	/**
	 * Get case-insensitive header `field` value.
	 * This is a deprecated internal API. Use `.get(field)` instead.
	 *
	 * (getHeader is no longer used internally by the superagent code base)
	 *
	 * @param {String} field
	 * @return {String}
	 * @api private
	 * @deprecated
	 */

	RequestBase.prototype.getHeader = RequestBase.prototype.get;

	/**
	 * Set header `field` to `val`, or multiple fields with one object.
	 * Case-insensitive.
	 *
	 * Examples:
	 *
	 *      req.get('/')
	 *        .set('Accept', 'application/json')
	 *        .set('X-API-Key', 'foobar')
	 *        .end(callback);
	 *
	 *      req.get('/')
	 *        .set({ Accept: 'application/json', 'X-API-Key': 'foobar' })
	 *        .end(callback);
	 *
	 * @param {String|Object} field
	 * @param {String} val
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.set = function(field, val){
	  if (isObject_1(field)) {
	    for (var key in field) {
	      this.set(key, field[key]);
	    }
	    return this;
	  }
	  this._header[field.toLowerCase()] = val;
	  this.header[field] = val;
	  return this;
	};

	/**
	 * Remove header `field`.
	 * Case-insensitive.
	 *
	 * Example:
	 *
	 *      req.get('/')
	 *        .unset('User-Agent')
	 *        .end(callback);
	 *
	 * @param {String} field
	 */
	RequestBase.prototype.unset = function(field){
	  delete this._header[field.toLowerCase()];
	  delete this.header[field];
	  return this;
	};

	/**
	 * Write the field `name` and `val`, or multiple fields with one object
	 * for "multipart/form-data" request bodies.
	 *
	 * ``` js
	 * request.post('/upload')
	 *   .field('foo', 'bar')
	 *   .end(callback);
	 *
	 * request.post('/upload')
	 *   .field({ foo: 'bar', baz: 'qux' })
	 *   .end(callback);
	 * ```
	 *
	 * @param {String|Object} name
	 * @param {String|Blob|File|Buffer|fs.ReadStream} val
	 * @return {Request} for chaining
	 * @api public
	 */
	RequestBase.prototype.field = function(name, val) {
	  // name should be either a string or an object.
	  if (null === name || undefined === name) {
	    throw new Error('.field(name, val) name can not be empty');
	  }

	  if (this._data) {
	    console.error(".field() can't be used if .send() is used. Please use only .send() or only .field() & .attach()");
	  }

	  if (isObject_1(name)) {
	    for (var key in name) {
	      this.field(key, name[key]);
	    }
	    return this;
	  }

	  if (Array.isArray(val)) {
	    for (var i in val) {
	      this.field(name, val[i]);
	    }
	    return this;
	  }

	  // val should be defined now
	  if (null === val || undefined === val) {
	    throw new Error('.field(name, val) val can not be empty');
	  }
	  if ('boolean' === typeof val) {
	    val = '' + val;
	  }
	  this._getFormData().append(name, val);
	  return this;
	};

	/**
	 * Abort the request, and clear potential timeout.
	 *
	 * @return {Request}
	 * @api public
	 */
	RequestBase.prototype.abort = function(){
	  if (this._aborted) {
	    return this;
	  }
	  this._aborted = true;
	  this.xhr && this.xhr.abort(); // browser
	  this.req && this.req.abort(); // node
	  this.clearTimeout();
	  this.emit('abort');
	  return this;
	};

	RequestBase.prototype._auth = function(user, pass, options, base64Encoder) {
	  switch (options.type) {
	    case 'basic':
	      this.set('Authorization', 'Basic ' + base64Encoder(user + ':' + pass));
	      break;

	    case 'auto':
	      this.username = user;
	      this.password = pass;
	      break;

	    case 'bearer': // usage would be .auth(accessToken, { type: 'bearer' })
	      this.set('Authorization', 'Bearer ' + user);
	      break;
	  }
	  return this;
	};

	/**
	 * Enable transmission of cookies with x-domain requests.
	 *
	 * Note that for this to work the origin must not be
	 * using "Access-Control-Allow-Origin" with a wildcard,
	 * and also must set "Access-Control-Allow-Credentials"
	 * to "true".
	 *
	 * @api public
	 */

	RequestBase.prototype.withCredentials = function(on) {
	  // This is browser-only functionality. Node side is no-op.
	  if (on == undefined) on = true;
	  this._withCredentials = on;
	  return this;
	};

	/**
	 * Set the max redirects to `n`. Does noting in browser XHR implementation.
	 *
	 * @param {Number} n
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.redirects = function(n){
	  this._maxRedirects = n;
	  return this;
	};

	/**
	 * Maximum size of buffered response body, in bytes. Counts uncompressed size.
	 * Default 200MB.
	 *
	 * @param {Number} n
	 * @return {Request} for chaining
	 */
	RequestBase.prototype.maxResponseSize = function(n){
	  if ('number' !== typeof n) {
	    throw TypeError("Invalid argument");
	  }
	  this._maxResponseSize = n;
	  return this;
	};

	/**
	 * Convert to a plain javascript object (not JSON string) of scalar properties.
	 * Note as this method is designed to return a useful non-this value,
	 * it cannot be chained.
	 *
	 * @return {Object} describing method, url, and data of this request
	 * @api public
	 */

	RequestBase.prototype.toJSON = function() {
	  return {
	    method: this.method,
	    url: this.url,
	    data: this._data,
	    headers: this._header,
	  };
	};

	/**
	 * Send `data` as the request body, defaulting the `.type()` to "json" when
	 * an object is given.
	 *
	 * Examples:
	 *
	 *       // manual json
	 *       request.post('/user')
	 *         .type('json')
	 *         .send('{"name":"tj"}')
	 *         .end(callback)
	 *
	 *       // auto json
	 *       request.post('/user')
	 *         .send({ name: 'tj' })
	 *         .end(callback)
	 *
	 *       // manual x-www-form-urlencoded
	 *       request.post('/user')
	 *         .type('form')
	 *         .send('name=tj')
	 *         .end(callback)
	 *
	 *       // auto x-www-form-urlencoded
	 *       request.post('/user')
	 *         .type('form')
	 *         .send({ name: 'tj' })
	 *         .end(callback)
	 *
	 *       // defaults to x-www-form-urlencoded
	 *      request.post('/user')
	 *        .send('name=tobi')
	 *        .send('species=ferret')
	 *        .end(callback)
	 *
	 * @param {String|Object} data
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.send = function(data){
	  var isObj = isObject_1(data);
	  var type = this._header['content-type'];

	  if (this._formData) {
	    console.error(".send() can't be used if .attach() or .field() is used. Please use only .send() or only .field() & .attach()");
	  }

	  if (isObj && !this._data) {
	    if (Array.isArray(data)) {
	      this._data = [];
	    } else if (!this._isHost(data)) {
	      this._data = {};
	    }
	  } else if (data && this._data && this._isHost(this._data)) {
	    throw Error("Can't merge these send calls");
	  }

	  // merge
	  if (isObj && isObject_1(this._data)) {
	    for (var key in data) {
	      this._data[key] = data[key];
	    }
	  } else if ('string' == typeof data) {
	    // default to x-www-form-urlencoded
	    if (!type) this.type('form');
	    type = this._header['content-type'];
	    if ('application/x-www-form-urlencoded' == type) {
	      this._data = this._data
	        ? this._data + '&' + data
	        : data;
	    } else {
	      this._data = (this._data || '') + data;
	    }
	  } else {
	    this._data = data;
	  }

	  if (!isObj || this._isHost(data)) {
	    return this;
	  }

	  // default to json
	  if (!type) this.type('json');
	  return this;
	};

	/**
	 * Sort `querystring` by the sort function
	 *
	 *
	 * Examples:
	 *
	 *       // default order
	 *       request.get('/user')
	 *         .query('name=Nick')
	 *         .query('search=Manny')
	 *         .sortQuery()
	 *         .end(callback)
	 *
	 *       // customized sort function
	 *       request.get('/user')
	 *         .query('name=Nick')
	 *         .query('search=Manny')
	 *         .sortQuery(function(a, b){
	 *           return a.length - b.length;
	 *         })
	 *         .end(callback)
	 *
	 *
	 * @param {Function} sort
	 * @return {Request} for chaining
	 * @api public
	 */

	RequestBase.prototype.sortQuery = function(sort) {
	  // _sort default to true but otherwise can be a function or boolean
	  this._sort = typeof sort === 'undefined' ? true : sort;
	  return this;
	};

	/**
	 * Compose querystring to append to req.url
	 *
	 * @api private
	 */
	RequestBase.prototype._finalizeQueryString = function(){
	  var query = this._query.join('&');
	  if (query) {
	    this.url += (this.url.indexOf('?') >= 0 ? '&' : '?') + query;
	  }
	  this._query.length = 0; // Makes the call idempotent

	  if (this._sort) {
	    var index = this.url.indexOf('?');
	    if (index >= 0) {
	      var queryArr = this.url.substring(index + 1).split('&');
	      if ('function' === typeof this._sort) {
	        queryArr.sort(this._sort);
	      } else {
	        queryArr.sort();
	      }
	      this.url = this.url.substring(0, index) + '?' + queryArr.join('&');
	    }
	  }
	};

	// For backwards compat only
	RequestBase.prototype._appendQueryString = function() {console.trace("Unsupported");};

	/**
	 * Invoke callback with timeout error.
	 *
	 * @api private
	 */

	RequestBase.prototype._timeoutError = function(reason, timeout, errno){
	  if (this._aborted) {
	    return;
	  }
	  var err = new Error(reason + timeout + 'ms exceeded');
	  err.timeout = timeout;
	  err.code = 'ECONNABORTED';
	  err.errno = errno;
	  this.timedout = true;
	  this.abort();
	  this.callback(err);
	};

	RequestBase.prototype._setTimeouts = function() {
	  var self = this;

	  // deadline
	  if (this._timeout && !this._timer) {
	    this._timer = setTimeout(function(){
	      self._timeoutError('Timeout of ', self._timeout, 'ETIME');
	    }, this._timeout);
	  }
	  // response timeout
	  if (this._responseTimeout && !this._responseTimeoutTimer) {
	    this._responseTimeoutTimer = setTimeout(function(){
	      self._timeoutError('Response timeout of ', self._responseTimeout, 'ETIMEDOUT');
	    }, this._responseTimeout);
	  }
	};

	/**
	 * Return the mime type for the given `str`.
	 *
	 * @param {String} str
	 * @return {String}
	 * @api private
	 */

	var type = function(str){
	  return str.split(/ *; */).shift();
	};

	/**
	 * Return header field parameters.
	 *
	 * @param {String} str
	 * @return {Object}
	 * @api private
	 */

	var params = function(str){
	  return str.split(/ *; */).reduce(function(obj, str){
	    var parts = str.split(/ *= */);
	    var key = parts.shift();
	    var val = parts.shift();

	    if (key && val) obj[key] = val;
	    return obj;
	  }, {});
	};

	/**
	 * Parse Link header fields.
	 *
	 * @param {String} str
	 * @return {Object}
	 * @api private
	 */

	var parseLinks = function(str){
	  return str.split(/ *, */).reduce(function(obj, str){
	    var parts = str.split(/ *; */);
	    var url = parts[0].slice(1, -1);
	    var rel = parts[1].split(/ *= */)[1].slice(1, -1);
	    obj[rel] = url;
	    return obj;
	  }, {});
	};

	/**
	 * Strip content related fields from `header`.
	 *
	 * @param {Object} header
	 * @return {Object} header
	 * @api private
	 */

	var cleanHeader = function(header, changesOrigin){
	  delete header['content-type'];
	  delete header['content-length'];
	  delete header['transfer-encoding'];
	  delete header['host'];
	  // secuirty
	  if (changesOrigin) {
	    delete header['authorization'];
	    delete header['cookie'];
	  }
	  return header;
	};

	var utils$1 = {
		type: type,
		params: params,
		parseLinks: parseLinks,
		cleanHeader: cleanHeader
	};

	/**
	 * Module dependencies.
	 */



	/**
	 * Expose `ResponseBase`.
	 */

	var responseBase = ResponseBase;

	/**
	 * Initialize a new `ResponseBase`.
	 *
	 * @api public
	 */

	function ResponseBase(obj) {
	  if (obj) return mixin$1(obj);
	}

	/**
	 * Mixin the prototype properties.
	 *
	 * @param {Object} obj
	 * @return {Object}
	 * @api private
	 */

	function mixin$1(obj) {
	  for (var key in ResponseBase.prototype) {
	    obj[key] = ResponseBase.prototype[key];
	  }
	  return obj;
	}

	/**
	 * Get case-insensitive `field` value.
	 *
	 * @param {String} field
	 * @return {String}
	 * @api public
	 */

	ResponseBase.prototype.get = function(field) {
	  return this.header[field.toLowerCase()];
	};

	/**
	 * Set header related properties:
	 *
	 *   - `.type` the content type without params
	 *
	 * A response of "Content-Type: text/plain; charset=utf-8"
	 * will provide you with a `.type` of "text/plain".
	 *
	 * @param {Object} header
	 * @api private
	 */

	ResponseBase.prototype._setHeaderProperties = function(header){
	    // TODO: moar!
	    // TODO: make this a util

	    // content-type
	    var ct = header['content-type'] || '';
	    this.type = utils$1.type(ct);

	    // params
	    var params = utils$1.params(ct);
	    for (var key in params) this[key] = params[key];

	    this.links = {};

	    // links
	    try {
	        if (header.link) {
	            this.links = utils$1.parseLinks(header.link);
	        }
	    } catch (err) {
	        // ignore
	    }
	};

	/**
	 * Set flags such as `.ok` based on `status`.
	 *
	 * For example a 2xx response will give you a `.ok` of __true__
	 * whereas 5xx will be __false__ and `.error` will be __true__. The
	 * `.clientError` and `.serverError` are also available to be more
	 * specific, and `.statusType` is the class of error ranging from 1..5
	 * sometimes useful for mapping respond colors etc.
	 *
	 * "sugar" properties are also defined for common cases. Currently providing:
	 *
	 *   - .noContent
	 *   - .badRequest
	 *   - .unauthorized
	 *   - .notAcceptable
	 *   - .notFound
	 *
	 * @param {Number} status
	 * @api private
	 */

	ResponseBase.prototype._setStatusProperties = function(status){
	    var type = status / 100 | 0;

	    // status / class
	    this.status = this.statusCode = status;
	    this.statusType = type;

	    // basics
	    this.info = 1 == type;
	    this.ok = 2 == type;
	    this.redirect = 3 == type;
	    this.clientError = 4 == type;
	    this.serverError = 5 == type;
	    this.error = (4 == type || 5 == type)
	        ? this.toError()
	        : false;

	    // sugar
	    this.accepted = 202 == status;
	    this.noContent = 204 == status;
	    this.badRequest = 400 == status;
	    this.unauthorized = 401 == status;
	    this.notAcceptable = 406 == status;
	    this.forbidden = 403 == status;
	    this.notFound = 404 == status;
	};

	function Agent() {
	  this._defaults = [];
	}

	["use", "on", "once", "set", "query", "type", "accept", "auth", "withCredentials", "sortQuery", "retry", "ok", "redirects",
	 "timeout", "buffer", "serialize", "parse", "ca", "key", "pfx", "cert"].forEach(function(fn) {
	  /** Default setting for all requests from this agent */
	  Agent.prototype[fn] = function(/*varargs*/) {
	    this._defaults.push({fn:fn, arguments:arguments});
	    return this;
	  };
	});

	Agent.prototype._setDefaults = function(req) {
	    this._defaults.forEach(function(def) {
	      req[def.fn].apply(req, def.arguments);
	    });
	};

	var agentBase = Agent;

	var client = createCommonjsModule(function (module, exports) {
	/**
	 * Root reference for iframes.
	 */

	var root;
	if (typeof window !== 'undefined') { // Browser window
	  root = window;
	} else if (typeof self !== 'undefined') { // Web Worker
	  root = self;
	} else { // Other environments
	  console.warn("Using browser-only version of superagent in non-browser environment");
	  root = commonjsGlobal;
	}







	/**
	 * Noop.
	 */

	function noop(){}
	/**
	 * Expose `request`.
	 */

	var request = exports = module.exports = function(method, url) {
	  // callback
	  if ('function' == typeof url) {
	    return new exports.Request('GET', method).end(url);
	  }

	  // url first
	  if (1 == arguments.length) {
	    return new exports.Request('GET', method);
	  }

	  return new exports.Request(method, url);
	};

	exports.Request = Request;

	/**
	 * Determine XHR.
	 */

	request.getXHR = function () {
	  if (root.XMLHttpRequest
	      && (!root.location || 'file:' != root.location.protocol
	          || !root.ActiveXObject)) {
	    return new XMLHttpRequest;
	  } else {
	    try { return new ActiveXObject('Microsoft.XMLHTTP'); } catch(e) {}
	    try { return new ActiveXObject('Msxml2.XMLHTTP.6.0'); } catch(e) {}
	    try { return new ActiveXObject('Msxml2.XMLHTTP.3.0'); } catch(e) {}
	    try { return new ActiveXObject('Msxml2.XMLHTTP'); } catch(e) {}
	  }
	  throw Error("Browser-only version of superagent could not find XHR");
	};

	/**
	 * Removes leading and trailing whitespace, added to support IE.
	 *
	 * @param {String} s
	 * @return {String}
	 * @api private
	 */

	var trim = ''.trim
	  ? function(s) { return s.trim(); }
	  : function(s) { return s.replace(/(^\s*|\s*$)/g, ''); };

	/**
	 * Serialize the given `obj`.
	 *
	 * @param {Object} obj
	 * @return {String}
	 * @api private
	 */

	function serialize(obj) {
	  if (!isObject_1(obj)) return obj;
	  var pairs = [];
	  for (var key in obj) {
	    pushEncodedKeyValuePair(pairs, key, obj[key]);
	  }
	  return pairs.join('&');
	}

	/**
	 * Helps 'serialize' with serializing arrays.
	 * Mutates the pairs array.
	 *
	 * @param {Array} pairs
	 * @param {String} key
	 * @param {Mixed} val
	 */

	function pushEncodedKeyValuePair(pairs, key, val) {
	  if (val != null) {
	    if (Array.isArray(val)) {
	      val.forEach(function(v) {
	        pushEncodedKeyValuePair(pairs, key, v);
	      });
	    } else if (isObject_1(val)) {
	      for(var subkey in val) {
	        pushEncodedKeyValuePair(pairs, key + '[' + subkey + ']', val[subkey]);
	      }
	    } else {
	      pairs.push(encodeURIComponent(key)
	        + '=' + encodeURIComponent(val));
	    }
	  } else if (val === null) {
	    pairs.push(encodeURIComponent(key));
	  }
	}

	/**
	 * Expose serialization method.
	 */

	request.serializeObject = serialize;

	/**
	  * Parse the given x-www-form-urlencoded `str`.
	  *
	  * @param {String} str
	  * @return {Object}
	  * @api private
	  */

	function parseString(str) {
	  var obj = {};
	  var pairs = str.split('&');
	  var pair;
	  var pos;

	  for (var i = 0, len = pairs.length; i < len; ++i) {
	    pair = pairs[i];
	    pos = pair.indexOf('=');
	    if (pos == -1) {
	      obj[decodeURIComponent(pair)] = '';
	    } else {
	      obj[decodeURIComponent(pair.slice(0, pos))] =
	        decodeURIComponent(pair.slice(pos + 1));
	    }
	  }

	  return obj;
	}

	/**
	 * Expose parser.
	 */

	request.parseString = parseString;

	/**
	 * Default MIME type map.
	 *
	 *     superagent.types.xml = 'application/xml';
	 *
	 */

	request.types = {
	  html: 'text/html',
	  json: 'application/json',
	  xml: 'text/xml',
	  urlencoded: 'application/x-www-form-urlencoded',
	  'form': 'application/x-www-form-urlencoded',
	  'form-data': 'application/x-www-form-urlencoded'
	};

	/**
	 * Default serialization map.
	 *
	 *     superagent.serialize['application/xml'] = function(obj){
	 *       return 'generated xml here';
	 *     };
	 *
	 */

	request.serialize = {
	  'application/x-www-form-urlencoded': serialize,
	  'application/json': JSON.stringify,
	};

	/**
	  * Default parsers.
	  *
	  *     superagent.parse['application/xml'] = function(str){
	  *       return { object parsed from str };
	  *     };
	  *
	  */

	request.parse = {
	  'application/x-www-form-urlencoded': parseString,
	  'application/json': JSON.parse,
	};

	/**
	 * Parse the given header `str` into
	 * an object containing the mapped fields.
	 *
	 * @param {String} str
	 * @return {Object}
	 * @api private
	 */

	function parseHeader(str) {
	  var lines = str.split(/\r?\n/);
	  var fields = {};
	  var index;
	  var line;
	  var field;
	  var val;

	  for (var i = 0, len = lines.length; i < len; ++i) {
	    line = lines[i];
	    index = line.indexOf(':');
	    if (index === -1) { // could be empty line, just skip it
	      continue;
	    }
	    field = line.slice(0, index).toLowerCase();
	    val = trim(line.slice(index + 1));
	    fields[field] = val;
	  }

	  return fields;
	}

	/**
	 * Check if `mime` is json or has +json structured syntax suffix.
	 *
	 * @param {String} mime
	 * @return {Boolean}
	 * @api private
	 */

	function isJSON(mime) {
	  // should match /json or +json
	  // but not /json-seq
	  return /[\/+]json($|[^-\w])/.test(mime);
	}

	/**
	 * Initialize a new `Response` with the given `xhr`.
	 *
	 *  - set flags (.ok, .error, etc)
	 *  - parse header
	 *
	 * Examples:
	 *
	 *  Aliasing `superagent` as `request` is nice:
	 *
	 *      request = superagent;
	 *
	 *  We can use the promise-like API, or pass callbacks:
	 *
	 *      request.get('/').end(function(res){});
	 *      request.get('/', function(res){});
	 *
	 *  Sending data can be chained:
	 *
	 *      request
	 *        .post('/user')
	 *        .send({ name: 'tj' })
	 *        .end(function(res){});
	 *
	 *  Or passed to `.send()`:
	 *
	 *      request
	 *        .post('/user')
	 *