vue-resource.js

/*!
 * vue-resource v1.5.1
 * https://github.com/pagekit/vue-resource
 * Released under the MIT License.
 */

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

    /**
     * Promises/A+ polyfill v1.1.4 (https://github.com/bramstein/promis)
     */

    var RESOLVED = 0;
    var REJECTED = 1;
    var PENDING = 2;

    function Promise$1(executor) {

        this.state = PENDING;
        this.value = undefined;
        this.deferred = [];

        var promise = this;

        try {
            executor(function (x) {
                promise.resolve(x);
            }, function (r) {
                promise.reject(r);
            });
        } catch (e) {
            promise.reject(e);
        }
    }

    Promise$1.reject = function (r) {
        return new Promise$1(function (resolve, reject) {
            reject(r);
        });
    };

    Promise$1.resolve = function (x) {
        return new Promise$1(function (resolve, reject) {
            resolve(x);
        });
    };

    Promise$1.all = function all(iterable) {
        return new Promise$1(function (resolve, reject) {
            var count = 0, result = [];

            if (iterable.length === 0) {
                resolve(result);
            }

            function resolver(i) {
                return function (x) {
                    result[i] = x;
                    count += 1;

                    if (count === iterable.length) {
                        resolve(result);
                    }
                };
            }

            for (var i = 0; i < iterable.length; i += 1) {
                Promise$1.resolve(iterable[i]).then(resolver(i), reject);
            }
        });
    };

    Promise$1.race = function race(iterable) {
        return new Promise$1(function (resolve, reject) {
            for (var i = 0; i < iterable.length; i += 1) {
                Promise$1.resolve(iterable[i]).then(resolve, reject);
            }
        });
    };

    var p = Promise$1.prototype;

    p.resolve = function resolve(x) {
        var promise = this;

        if (promise.state === PENDING) {
            if (x === promise) {
                throw new TypeError('Promise settled with itself.');
            }

            var called = false;

            try {
                var then = x && x['then'];

                if (x !== null && typeof x === 'object' && typeof then === 'function') {
                    then.call(x, function (x) {
                        if (!called) {
                            promise.resolve(x);
                        }
                        called = true;

                    }, function (r) {
                        if (!called) {
                            promise.reject(r);
                        }
                        called = true;
                    });
                    return;
                }
            } catch (e) {
                if (!called) {
                    promise.reject(e);
                }
                return;
            }

            promise.state = RESOLVED;
            promise.value = x;
            promise.notify();
        }
    };

    p.reject = function reject(reason) {
        var promise = this;

        if (promise.state === PENDING) {
            if (reason === promise) {
                throw new TypeError('Promise settled with itself.');
            }

            promise.state = REJECTED;
            promise.value = reason;
            promise.notify();
        }
    };

    p.notify = function notify() {
        var promise = this;

        nextTick(function () {
            if (promise.state !== PENDING) {
                while (promise.deferred.length) {
                    var deferred = promise.deferred.shift(),
                        onResolved = deferred[0],
                        onRejected = deferred[1],
                        resolve = deferred[2],
                        reject = deferred[3];

                    try {
                        if (promise.state === RESOLVED) {
                            if (typeof onResolved === 'function') {
                                resolve(onResolved.call(undefined, promise.value));
                            } else {
                                resolve(promise.value);
                            }
                        } else if (promise.state === REJECTED) {
                            if (typeof onRejected === 'function') {
                                resolve(onRejected.call(undefined, promise.value));
                            } else {
                                reject(promise.value);
                            }
                        }
                    } catch (e) {
                        reject(e);
                    }
                }
            }
        });
    };

    p.then = function then(onResolved, onRejected) {
        var promise = this;

        return new Promise$1(function (resolve, reject) {
            promise.deferred.push([onResolved, onRejected, resolve, reject]);
            promise.notify();
        });
    };

    p.catch = function (onRejected) {
        return this.then(undefined, onRejected);
    };

    /**
     * Promise adapter.
     */

    if (typeof Promise === 'undefined') {
        window.Promise = Promise$1;
    }

    function PromiseObj(executor, context) {

        if (executor instanceof Promise) {
            this.promise = executor;
        } else {
            this.promise = new Promise(executor.bind(context));
        }

        this.context = context;
    }

    PromiseObj.all = function (iterable, context) {
        return new PromiseObj(Promise.all(iterable), context);
    };

    PromiseObj.resolve = function (value, context) {
        return new PromiseObj(Promise.resolve(value), context);
    };

    PromiseObj.reject = function (reason, context) {
        return new PromiseObj(Promise.reject(reason), context);
    };

    PromiseObj.race = function (iterable, context) {
        return new PromiseObj(Promise.race(iterable), context);
    };

    var p$1 = PromiseObj.prototype;

    p$1.bind = function (context) {
        this.context = context;
        return this;
    };

    p$1.then = function (fulfilled, rejected) {

        if (fulfilled && fulfilled.bind && this.context) {
            fulfilled = fulfilled.bind(this.context);
        }

        if (rejected && rejected.bind && this.context) {
            rejected = rejected.bind(this.context);
        }

        return new PromiseObj(this.promise.then(fulfilled, rejected), this.context);
    };

    p$1.catch = function (rejected) {

        if (rejected && rejected.bind && this.context) {
            rejected = rejected.bind(this.context);
        }

        return new PromiseObj(this.promise.catch(rejected), this.context);
    };

    p$1.finally = function (callback) {

        return this.then(function (value) {
            callback.call(this);
            return value;
        }, function (reason) {
            callback.call(this);
            return Promise.reject(reason);
        }
        );
    };

    /**
     * Utility functions.
     */

    var ref = {};
    var hasOwnProperty = ref.hasOwnProperty;
    var ref$1 = [];
    var slice = ref$1.slice;
    var debug = false, ntick;

    var inBrowser = typeof window !== 'undefined';

    function Util (ref) {
        var config = ref.config;
        var nextTick = ref.nextTick;

        ntick = nextTick;
        debug = config.debug || !config.silent;
    }

    function warn(msg) {
        if (typeof console !== 'undefined' && debug) {
            console.warn('[VueResource warn]: ' + msg);
        }
    }

    function error(msg) {
        if (typeof console !== 'undefined') {
            console.error(msg);
        }
    }

    function nextTick(cb, ctx) {
        return ntick(cb, ctx);
    }

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

    function trimEnd(str, chars) {

        if (str && chars === undefined) {
            return str.replace(/\s+$/, '');
        }

        if (!str || !chars) {
            return str;
        }

        return str.replace(new RegExp(("[" + chars + "]+$")), '');
    }

    function toLower(str) {
        return str ? str.toLowerCase() : '';
    }

    function toUpper(str) {
        return str ? str.toUpperCase() : '';
    }

    var isArray = Array.isArray;

    function isString(val) {
        return typeof val === 'string';
    }

    function isFunction(val) {
        return typeof val === 'function';
    }

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

    function isPlainObject(obj) {
        return isObject(obj) && Object.getPrototypeOf(obj) == Object.prototype;
    }

    function isBlob(obj) {
        return typeof Blob !== 'undefined' && obj instanceof Blob;
    }

    function isFormData(obj) {
        return typeof FormData !== 'undefined' && obj instanceof FormData;
    }

    function when(value, fulfilled, rejected) {

        var promise = PromiseObj.resolve(value);

        if (arguments.length < 2) {
            return promise;
        }

        return promise.then(fulfilled, rejected);
    }

    function options(fn, obj, opts) {

        opts = opts || {};

        if (isFunction(opts)) {
            opts = opts.call(obj);
        }

        return merge(fn.bind({$vm: obj, $options: opts}), fn, {$options: opts});
    }

    function each(obj, iterator) {

        var i, key;

        if (isArray(obj)) {
            for (i = 0; i < obj.length; i++) {
                iterator.call(obj[i], obj[i], i);
            }
        } else if (isObject(obj)) {
            for (key in obj) {
                if (hasOwnProperty.call(obj, key)) {
                    iterator.call(obj[key], obj[key], key);
                }
            }
        }

        return obj;
    }

    var assign = Object.assign || _assign;

    function merge(target) {

        var args = slice.call(arguments, 1);

        args.forEach(function (source) {
            _merge(target, source, true);
        });

        return target;
    }

    function defaults(target) {

        var args = slice.call(arguments, 1);

        args.forEach(function (source) {

            for (var key in source) {
                if (target[key] === undefined) {
                    target[key] = source[key];
                }
            }

        });

        return target;
    }

    function _assign(target) {

        var args = slice.call(arguments, 1);

        args.forEach(function (source) {
            _merge(target, source);
        });

        return target;
    }

    function _merge(target, source, deep) {
        for (var key in source) {
            if (deep && (isPlainObject(source[key]) || isArray(source[key]))) {
                if (isPlainObject(source[key]) && !isPlainObject(target[key])) {
                    target[key] = {};
                }
                if (isArray(source[key]) && !isArray(target[key])) {
                    target[key] = [];
                }
                _merge(target[key], source[key], deep);
            } else if (source[key] !== undefined) {
                target[key] = source[key];
            }
        }
    }

    /**
     * Root Prefix Transform.
     */

    function root (options$$1, next) {

        var url = next(options$$1);

        if (isString(options$$1.root) && !/^(https?:)?\//.test(url)) {
            url = trimEnd(options$$1.root, '/') + '/' + url;
        }

        return url;
    }

    /**
     * Query Parameter Transform.
     */

    function query (options$$1, next) {

        var urlParams = Object.keys(Url.options.params), query = {}, url = next(options$$1);

        each(options$$1.params, function (value, key) {
            if (urlParams.indexOf(key) === -1) {
                query[key] = value;
            }
        });

        query = Url.params(query);

        if (query) {
            url += (url.indexOf('?') == -1 ? '?' : '&') + query;
        }

        return url;
    }

    /**
     * URL Template v2.0.6 (https://github.com/bramstein/url-template)
     */

    function expand(url, params, variables) {

        var tmpl = parse(url), expanded = tmpl.expand(params);

        if (variables) {
            variables.push.apply(variables, tmpl.vars);
        }

        return expanded;
    }

    function parse(template) {

        var operators = ['+', '#', '.', '/', ';', '?', '&'], variables = [];

        return {
            vars: variables,
            expand: function expand(context) {
                return template.replace(/\{([^{}]+)\}|([^{}]+)/g, function (_, expression, literal) {
                    if (expression) {

                        var operator = null, values = [];

                        if (operators.indexOf(expression.charAt(0)) !== -1) {
                            operator = expression.charAt(0);
                            expression = expression.substr(1);
                        }

                        expression.split(/,/g).forEach(function (variable) {
                            var tmp = /([^:*]*)(?::(\d+)|(\*))?/.exec(variable);
                            values.push.apply(values, getValues(context, operator, tmp[1], tmp[2] || tmp[3]));
                            variables.push(tmp[1]);
                        });

                        if (operator && operator !== '+') {

                            var separator = ',';

                            if (operator === '?') {
                                separator = '&';
                            } else if (operator !== '#') {
                                separator = operator;
                            }

                            return (values.length !== 0 ? operator : '') + values.join(separator);
                        } else {
                            return values.join(',');
                        }

                    } else {
                        return encodeReserved(literal);
                    }
                });
            }
        };
    }

    function getValues(context, operator, key, modifier) {

        var value = context[key], result = [];

        if (isDefined(value) && value !== '') {
            if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean') {
                value = value.toString();

                if (modifier && modifier !== '*') {
                    value = value.substring(0, parseInt(modifier, 10));
                }

                result.push(encodeValue(operator, value, isKeyOperator(operator) ? key : null));
            } else {
                if (modifier === '*') {
                    if (Array.isArray(value)) {
                        value.filter(isDefined).forEach(function (value) {
                            result.push(encodeValue(operator, value, isKeyOperator(operator) ? key : null));
                        });
                    } else {
                        Object.keys(value).forEach(function (k) {
                            if (isDefined(value[k])) {
                                result.push(encodeValue(operator, value[k], k));
                            }
                        });
                    }
                } else {
                    var tmp = [];

                    if (Array.isArray(value)) {
                        value.filter(isDefined).forEach(function (value) {
                            tmp.push(encodeValue(operator, value));
                        });
                    } else {
                        Object.keys(value).forEach(function (k) {
                            if (isDefined(value[k])) {
                                tmp.push(encodeURIComponent(k));
                                tmp.push(encodeValue(operator, value[k].toString()));
                            }
                        });
                    }

                    if (isKeyOperator(operator)) {
                        result.push(encodeURIComponent(key) + '=' + tmp.join(','));
                    } else if (tmp.length !== 0) {
                        result.push(tmp.join(','));
                    }
                }
            }
        } else {
            if (operator === ';') {
                result.push(encodeURIComponent(key));
            } else if (value === '' && (operator === '&' || operator === '?')) {
                result.push(encodeURIComponent(key) + '=');
            } else if (value === '') {
                result.push('');
            }
        }

        return result;
    }

    function isDefined(value) {
        return value !== undefined && value !== null;
    }

    function isKeyOperator(operator) {
        return operator === ';' || operator === '&' || operator === '?';
    }

    function encodeValue(operator, value, key) {

        value = (operator === '+' || operator === '#') ? encodeReserved(value) : encodeURIComponent(value);

        if (key) {
            return encodeURIComponent(key) + '=' + value;
        } else {
            return value;
        }
    }

    function encodeReserved(str) {
        return str.split(/(%[0-9A-Fa-f]{2})/g).map(function (part) {
            if (!/%[0-9A-Fa-f]/.test(part)) {
                part = encodeURI(part);
            }
            return part;
        }).join('');
    }

    /**
     * URL Template (RFC 6570) Transform.
     */

    function template (options) {

        var variables = [], url = expand(options.url, options.params, variables);

        variables.forEach(function (key) {
            delete options.params[key];
        });

        return url;
    }

    /**
     * Service for URL templating.
     */

    function Url(url, params) {

        var self = this || {}, options$$1 = url, transform;

        if (isString(url)) {
            options$$1 = {url: url, params: params};
        }

        options$$1 = merge({}, Url.options, self.$options, options$$1);

        Url.transforms.forEach(function (handler) {

            if (isString(handler)) {
                handler = Url.transform[handler];
            }

            if (isFunction(handler)) {
                transform = factory(handler, transform, self.$vm);
            }

        });

        return transform(options$$1);
    }

    /**
     * Url options.
     */

    Url.options = {
        url: '',
        root: null,
        params: {}
    };

    /**
     * Url transforms.
     */

    Url.transform = {template: template, query: query, root: root};
    Url.transforms = ['template', 'query', 'root'];

    /**
     * Encodes a Url parameter string.
     *
     * @param {Object} obj
     */

    Url.params = function (obj) {

        var params = [], escape = encodeURIComponent;

        params.add = function (key, value) {

            if (isFunction(value)) {
                value = value();
            }

            if (value === null) {
                value = '';
            }

            this.push(escape(key) + '=' + escape(value));
        };

        serialize(params, obj);

        return params.join('&').replace(/%20/g, '+');
    };

    /**
     * Parse a URL and return its components.
     *
     * @param {String} url
     */

    Url.parse = function (url) {

        var el = document.createElement('a');

        if (document.documentMode) {
            el.href = url;
            url = el.href;
        }

        el.href = url;

        return {
            href: el.href,
            protocol: el.protocol ? el.protocol.replace(/:$/, '') : '',
            port: el.port,
            host: el.host,
            hostname: el.hostname,
            pathname: el.pathname.charAt(0) === '/' ? el.pathname : '/' + el.pathname,
            search: el.search ? el.search.replace(/^\?/, '') : '',
            hash: el.hash ? el.hash.replace(/^#/, '') : ''
        };
    };

    function factory(handler, next, vm) {
        return function (options$$1) {
            return handler.call(vm, options$$1, next);
        };
    }

    function serialize(params, obj, scope) {

        var array = isArray(obj), plain = isPlainObject(obj), hash;

        each(obj, function (value, key) {

            hash = isObject(value) || isArray(value);

            if (scope) {
                key = scope + '[' + (plain || hash ? key : '') + ']';
            }

            if (!scope && array) {
                params.add(value.name, value.value);
            } else if (hash) {
                serialize(params, value, key);
            } else {
                params.add(key, value);
            }
        });
    }

    /**
     * XDomain client (Internet Explorer).
     */

    function xdrClient (request) {
        return new PromiseObj(function (resolve) {

            var xdr = new XDomainRequest(), handler = function (ref) {
                    var type = ref.type;


                    var status = 0;

                    if (type === 'load') {
                        status = 200;
                    } else if (type === 'error') {
                        status = 500;
                    }

                    resolve(request.respondWith(xdr.responseText, {status: status}));
                };

            request.abort = function () { return xdr.abort(); };

            xdr.open(request.method, request.getUrl());

            if (request.timeout) {
                xdr.timeout = request.timeout;
            }

            xdr.onload = handler;
            xdr.onabort = handler;
            xdr.onerror = handler;
            xdr.ontimeout = handler;
            xdr.onprogress = function () {};
            xdr.send(request.getBody());
        });
    }

    /**
     * CORS Interceptor.
     */

    var SUPPORTS_CORS = inBrowser && 'withCredentials' in new XMLHttpRequest();

    function cors (request) {

        if (inBrowser) {

            var orgUrl = Url.parse(location.href);
            var reqUrl = Url.parse(request.getUrl());

            if (reqUrl.protocol !== orgUrl.protocol || reqUrl.host !== orgUrl.host) {

                request.crossOrigin = true;
                request.emulateHTTP = false;

                if (!SUPPORTS_CORS) {
                    request.client = xdrClient;
                }
            }
        }

    }

    /**
     * Form data Interceptor.
     */

    function form (request) {

        if (isFormData(request.body)) {
            request.headers.delete('Content-Type');
        } else if (isObject(request.body) && request.emulateJSON) {
            request.body = Url.params(request.body);
            request.headers.set('Content-Type', 'application/x-www-form-urlencoded');
        }

    }

    /**
     * JSON Interceptor.
     */

    function json (request) {

        var type = request.headers.get('Content-Type') || '';

        if (isObject(request.body) && type.indexOf('application/json') === 0) {
            request.body = JSON.stringify(request.body);
        }

        return function (response) {

            return response.bodyText ? when(response.text(), function (text) {

                var type = response.headers.get('Content-Type') || '';

                if (type.indexOf('application/json') === 0 || isJson(text)) {

                    try {
                        response.body = JSON.parse(text);
                    } catch (e) {
                        response.body = null;
                    }

                } else {
                    response.body = text;
                }

                return response;

            }) : response;

        };
    }

    function isJson(str) {

        var start = str.match(/^\s*(\[|\{)/);
        var end = {'[': /]\s*$/, '{': /}\s*$/};

        return start && end[start[1]].test(str);
    }

    /**
     * JSONP client (Browser).
     */

    function jsonpClient (request) {
        return new PromiseObj(function (resolve) {

            var name = request.jsonp || 'callback', callback = request.jsonpCallback || '_jsonp' + Math.random().toString(36).substr(2), body = null, handler, script;

            handler = function (ref) {
                var type = ref.type;


                var status = 0;

                if (type === 'load' && body !== null) {
                    status = 200;
                } else if (type === 'error') {
                    status = 500;
                }

                if (status && window[callback]) {
                    delete window[callback];
                    document.body.removeChild(script);
                }

                resolve(request.respondWith(body, {status: status}));
            };

            window[callback] = function (result) {
                body = JSON.stringify(result);
            };

            request.abort = function () {
                handler({type: 'abort'});
            };

            request.params[name] = callback;

            if (request.timeout) {
                setTimeout(request.abort, request.timeout);
            }

            script = document.createElement('script');
            script.src = request.getUrl();
            script.type = 'text/javascript';
            script.async = true;
            script.onload = handler;
            script.onerror = handler;

            document.body.appendChild(script);
        });
    }

    /**
     * JSONP Interceptor.
     */

    function jsonp (request) {

        if (request.method == 'JSONP') {
            request.client = jsonpClient;
        }

    }

    /**
     * Before Interceptor.
     */

    function before (request) {

        if (isFunction(request.before)) {
            request.before.call(this, request);
        }

    }

    /**
     * HTTP method override Interceptor.
     */

    function method (request) {

        if (request.emulateHTTP && /^(PUT|PATCH|DELETE)$/i.test(request.method)) {
            request.headers.set('X-HTTP-Method-Override', request.method);
            request.method = 'POST';
        }

    }

    /**
     * Header Interceptor.
     */

    function header (request) {

        var headers = assign({}, Http.headers.common,
            !request.crossOrigin ? Http.headers.custom : {},
            Http.headers[toLower(request.method)]
        );

        each(headers, function (value, name) {
            if (!request.headers.has(name)) {
                request.headers.set(name, value);
            }
        });

    }

    /**
     * XMLHttp client (Browser).
     */

    function xhrClient (request) {
        return new PromiseObj(function (resolve) {

            var xhr = new XMLHttpRequest(), handler = function (event) {

                    var response = request.respondWith(
                    'response' in xhr ? xhr.response : xhr.responseText, {
                        status: xhr.status === 1223 ? 204 : xhr.status, // IE9 status bug
                        statusText: xhr.status === 1223 ? 'No Content' : trim(xhr.statusText)
                    });

                    each(trim(xhr.getAllResponseHeaders()).split('\n'), function (row) {
                        response.headers.append(row.slice(0, row.indexOf(':')), row.slice(row.indexOf(':') + 1));
                    });

                    resolve(response);
                };

            request.abort = function () { return xhr.abort(); };

            xhr.open(request.method, request.getUrl(), true);

            if (request.timeout) {
                xhr.timeout = request.timeout;
            }

            if (request.responseType && 'responseType' in xhr) {
                xhr.responseType = request.responseType;
            }

            if (request.withCredentials || request.credentials) {
                xhr.withCredentials = true;
            }

            if (!request.crossOrigin) {
                request.headers.set('X-Requested-With', 'XMLHttpRequest');
            }

            // deprecated use downloadProgress
            if (isFunction(request.progress) && request.method === 'GET') {
                xhr.addEventListener('progress', request.progress);
            }

            if (isFunction(request.downloadProgress)) {
                xhr.addEventListener('progress', request.downloadProgress);
            }

            // deprecated use uploadProgress
            if (isFunction(request.progress) && /^(POST|PUT)$/i.test(request.method)) {
                xhr.upload.addEventListener('progress', request.progress);
            }

            if (isFunction(request.uploadProgress) && xhr.upload) {
                xhr.upload.addEventListener('progress', request.uploadProgress);
            }

            request.headers.forEach(function (value, name) {
                xhr.setRequestHeader(name, value);
            });

            xhr.onload = handler;
            xhr.onabort = handler;
            xhr.onerror = handler;
            xhr.ontimeout = handler;
            xhr.send(request.getBody());
        });
    }

    /**
     * Http client (Node).
     */

    function nodeClient (request) {

        var client = require('got');

        return new PromiseObj(function (resolve) {

            var url = request.getUrl();
            var body = request.getBody();
            var method = request.method;
            var headers = {}, handler;

            request.headers.forEach(function (value, name) {
                headers[name] = value;
            });

            client(url, {body: body, method: method, headers: headers}).then(handler = function (resp) {

                var response = request.respondWith(resp.body, {
                    status: resp.statusCode,
                    statusText: trim(resp.statusMessage)
                });

                each(resp.headers, function (value, name) {
                    response.headers.set(name, value);
                });

                resolve(response);

            }, function (error$$1) { return handler(error$$1.response); });
        });
    }

    /**
     * Base client.
     */

    function Client (context) {

        var reqHandlers = [sendRequest], resHandlers = [];

        if (!isObject(context)) {
            context = null;
        }

        function Client(request) {
            while (reqHandlers.length) {

                var handler = reqHandlers.pop();

                if (isFunction(handler)) {

                    var response = (void 0), next = (void 0);

                    response = handler.call(context, request, function (val) { return next = val; }) || next;

                    if (isObject(response)) {
                        return new PromiseObj(function (resolve, reject) {

                            resHandlers.forEach(function (handler) {
                                response = when(response, function (response) {
                                    return handler.call(context, response) || response;
                                }, reject);
                            });

                            when(response, resolve, reject);

                        }, context);
                    }

                    if (isFunction(response)) {
                        resHandlers.unshift(response);
                    }

                } else {
                    warn(("Invalid interceptor of type " + (typeof handler) + ", must be a function"));
                }
            }
        }

        Client.use = function (handler) {
            reqHandlers.push(handler);
        };

        return Client;
    }

    function sendRequest(request) {

        var client = request.client || (inBrowser ? xhrClient : nodeClient);

        return client(request);
    }

    /**
     * HTTP Headers.
     */

    var Headers = function Headers(headers) {
        var this$1 = this;


        this.map = {};

        each(headers, function (value, name) { return this$1.append(name, value); });
    };

    Headers.prototype.has = function has (name) {
        return getName(this.map, name) !== null;
    };

    Headers.prototype.get = function get (name) {

        var list = this.map[getName(this.map, name)];

        return list ? list.join() : null;
    };

    Headers.prototype.getAll = function getAll (name) {
        return this.map[getName(this.map, name)] || [];
    };

    Headers.prototype.set = function set (name, value) {
        this.map[normalizeName(getName(this.map, name) || name)] = [trim(value)];
    };

    Headers.prototype.append = function append (name, value) {

        var list = this.map[getName(this.map, name)];

        if (list) {
            list.push(trim(value));
        } else {
            this.set(name, value);
        }
    };

    Headers.prototype.delete = function delete$1 (name) {
        delete this.map[getName(this.map, name)];
    };

    Headers.prototype.deleteAll = function deleteAll () {
        this.map = {};
    };

    Headers.prototype.forEach = function forEach (callback, thisArg) {
            var this$1 = this;

        each(this.map, function (list, name) {
            each(list, function (value) { return callback.call(thisArg, value, name, this$1); });
        });
    };

    function getName(map, name) {
        return Object.keys(map).reduce(function (prev, curr) {
            return toLower(name) === toLower(curr) ? curr : prev;
        }, null);
    }

    function normalizeName(name) {

        if (/[^a-z0-9\-#$%&'*+.^_`|~]/i.test(name)) {
            throw new TypeError('Invalid character in header field name');
        }

        return trim(name);
    }

    /**
     * HTTP Response.
     */

    var Response = function Response(body, ref) {
        var url = ref.url;
        var headers = ref.headers;
        var status = ref.status;
        var statusText = ref.statusText;


        this.url = url;
        this.ok = status >= 200 && status < 300;
        this.status = status || 0;
        this.statusText = statusText || '';
        this.headers = new Headers(headers);
        this.body = body;

        if (isString(body)) {

            this.bodyText = body;

        } else if (isBlob(body)) {

            this.bodyBlob = body;

            if (isBlobText(body)) {
                this.bodyText = blobText(body);
            }
        }
    };

    Response.prototype.blob = function blob () {
        return when(this.bodyBlob);
    };

    Response.prototype.text = function text () {
        return when(this.bodyText);
    };

    Response.prototype.json = function json () {
        return when(this.text(), function (text) { return JSON.parse(text); });
    };

    Object.defineProperty(Response.prototype, 'data', {

        get: function get() {
            return this.body;
        },

        set: function set(body) {
            this.body = body;
        }

    });

    function blobText(body) {
        return new PromiseObj(function (resolve) {

            var reader = new FileReader();

            reader.readAsText(body);
            reader.onload = function () {
                resolve(reader.result);
            };

        });
    }

    function isBlobText(body) {
        return body.type.indexOf('text') === 0 || body.type.indexOf('json') !== -1;
    }

    /**
     * HTTP Request.
     */

    var Request = function Request(options$$1) {

        this.body = null;
        this.params = {};

        assign(this, options$$1, {
            method: toUpper(options$$1.method || 'GET')
        });

        if (!(this.headers instanceof Headers)) {
            this.headers = new Headers(this.headers);
        }
    };

    Request.prototype.getUrl = function getUrl () {
        return Url(this);
    };

    Request.prototype.getBody = function getBody () {
        return this.body;
    };

    Request.prototype.respondWith = function respondWith (body, options$$1) {
        return new Response(body, assign(options$$1 || {}, {url: this.getUrl()}));
    };

    /**
     * Service for sending network requests.
     */

    var COMMON_HEADERS = {'Accept': 'application/json, text/plain, */*'};
    var JSON_CONTENT_TYPE = {'Content-Type': 'application/json;charset=utf-8'};

    function Http(options$$1) {

        var self = this || {}, client = Client(self.$vm);

        defaults(options$$1 || {}, self.$options, Http.options);

        Http.interceptors.forEach(function (handler) {

            if (isString(handler)) {
                handler = Http.interceptor[handler];
            }

            if (isFunction(handler)) {
                client.use(handler);
            }

        });

        return client(new Request(options$$1)).then(function (response) {

            return response.ok ? response : PromiseObj.reject(response);

        }, function (response) {

            if (response instanceof Error) {
                error(response);
            }

            return PromiseObj.reject(response);
        });
    }

    Http.options = {};

    Http.headers = {
        put: JSON_CONTENT_TYPE,
        post: JSON_CONTENT_TYPE,
        patch: JSON_CONTENT_TYPE,
        delete: JSON_CONTENT_TYPE,
        common: COMMON_HEADERS,
        custom: {}
    };

    Http.interceptor = {before: before, method: method, jsonp: jsonp, json: json, form: form, header: header, cors: cors};
    Http.interceptors = ['before', 'method', 'jsonp', 'json', 'form', 'header', 'cors'];

    ['get', 'delete', 'head', 'jsonp'].forEach(function (method$$1) {

        Http[method$$1] = function (url, options$$1) {
            return this(assign(options$$1 || {}, {url: url, method: method$$1}));
        };

    });

    ['post', 'put', 'patch'].forEach(function (method$$1) {

        Http[method$$1] = function (url, body, options$$1) {
            return this(assign(options$$1 || {}, {url: url, method: method$$1, body: body}));
        };

    });

    /**
     * Service for interacting with RESTful services.
     */

    function Resource(url, params, actions, options$$1) {

        var self = this || {}, resource = {};

        actions = assign({},
            Resource.actions,
            actions
        );

        each(actions, function (action, name) {

            action = merge({url: url, params: assign({}, params)}, options$$1, action);

            resource[name] = function () {
                return (self.$http || Http)(opts(action, arguments));
            };
        });

        return resource;
    }

    function opts(action, args) {

        var options$$1 = assign({}, action), params = {}, body;

        switch (args.length) {

            case 2:

                params = args[0];
                body = args[1];

                break;

            case 1:

                if (/^(POST|PUT|PATCH)$/i.test(options$$1.method)) {
                    body = args[0];
                } else {
                    params = args[0];
                }

                break;

            case 0:

                break;

            default:

                throw 'Expected up to 2 arguments [params, body], got ' + args.length + ' arguments';
        }

        options$$1.body = body;
        options$$1.params = assign({}, options$$1.params, params);

        return options$$1;
    }

    Resource.actions = {

        get: {method: 'GET'},
        save: {method: 'POST'},
        query: {method: 'GET'},
        update: {method: 'PUT'},
        remove: {method: 'DELETE'},
        delete: {method: 'DELETE'}

    };

    /**
     * Install plugin.
     */

    function plugin(Vue) {

        if (plugin.installed) {
            return;
        }

        Util(Vue);

        Vue.url = Url;
        Vue.http = Http;
        Vue.resource = Resource;
        Vue.Promise = PromiseObj;

        Object.defineProperties(Vue.prototype, {

            $url: {
                get: function get() {
                    return options(Vue.url, this, this.$options.url);
                }
            },

            $http: {
                get: function get() {
                    return options(Vue.http, this, this.$options.http);
                }
            },

            $resource: {
                get: function get() {
                    return Vue.resource.bind(this);
                }
            },

            $promise: {
                get: function get() {
                    var this$1 = this;

                    return function (executor) { return new Vue.Promise(executor, this$1); };
                }
            }

        });
    }

    if (typeof window !== 'undefined' && window.Vue) {
        window.Vue.use(plugin);
    }

    return plugin;

})));