diff --git a/assets/index.html b/assets/index.html
index de2af45..39a2ac8 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -353,15 +353,17 @@
             </div>
         </div>
     </div>
+    <!-- polyfill -->
+    <script src="./static/javascripts/fetch.umd.js"></script>
+    <script src="./static/javascripts/url-polyfill.min.js"></script>
+    <!-- external -->
     <script src="./static/javascripts/vue.min.js"></script>
     <script src="./static/javascripts/popper.min.js"></script>
     <script src="./static/javascripts/bootstrap-vue.min.js"></script>
     <script src="./static/javascripts/Readability.js"></script>
     <script src="./static/javascripts/purify.min.js"></script>
+    <!-- internal -->
     <script src="./static/javascripts/api.js"></script>
     <script src="./static/javascripts/app.js"></script>
-    <!--[if IE ]>
-    <script src="./javascripts/url-polyfill.min.js"></script>
-    <![endif]-->
 </body>
 </html>
diff --git a/assets/javascripts/fetch.umd.js b/assets/javascripts/fetch.umd.js
new file mode 100644
index 0000000..473b22c
--- /dev/null
+++ b/assets/javascripts/fetch.umd.js
@@ -0,0 +1,609 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (factory((global.WHATWGFetch = {})));
+}(this, (function (exports) { 'use strict';
+
+  var global = (typeof self !== 'undefined' && self) || (typeof global !== 'undefined' && global);
+
+  var support = {
+    searchParams: 'URLSearchParams' in global,
+    iterable: 'Symbol' in global && 'iterator' in Symbol,
+    blob:
+      'FileReader' in global &&
+      'Blob' in global &&
+      (function() {
+        try {
+          new Blob();
+          return true
+        } catch (e) {
+          return false
+        }
+      })(),
+    formData: 'FormData' in global,
+    arrayBuffer: 'ArrayBuffer' in global
+  };
+
+  function isDataView(obj) {
+    return obj && DataView.prototype.isPrototypeOf(obj)
+  }
+
+  if (support.arrayBuffer) {
+    var viewClasses = [
+      '[object Int8Array]',
+      '[object Uint8Array]',
+      '[object Uint8ClampedArray]',
+      '[object Int16Array]',
+      '[object Uint16Array]',
+      '[object Int32Array]',
+      '[object Uint32Array]',
+      '[object Float32Array]',
+      '[object Float64Array]'
+    ];
+
+    var isArrayBufferView =
+      ArrayBuffer.isView ||
+      function(obj) {
+        return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
+      };
+  }
+
+  function normalizeName(name) {
+    if (typeof name !== 'string') {
+      name = String(name);
+    }
+    if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
+      throw new TypeError('Invalid character in header field name')
+    }
+    return name.toLowerCase()
+  }
+
+  function normalizeValue(value) {
+    if (typeof value !== 'string') {
+      value = String(value);
+    }
+    return value
+  }
+
+  // Build a destructive iterator for the value list
+  function iteratorFor(items) {
+    var iterator = {
+      next: function() {
+        var value = items.shift();
+        return {done: value === undefined, value: value}
+      }
+    };
+
+    if (support.iterable) {
+      iterator[Symbol.iterator] = function() {
+        return iterator
+      };
+    }
+
+    return iterator
+  }
+
+  function Headers(headers) {
+    this.map = {};
+
+    if (headers instanceof Headers) {
+      headers.forEach(function(value, name) {
+        this.append(name, value);
+      }, this);
+    } else if (Array.isArray(headers)) {
+      headers.forEach(function(header) {
+        this.append(header[0], header[1]);
+      }, this);
+    } else if (headers) {
+      Object.getOwnPropertyNames(headers).forEach(function(name) {
+        this.append(name, headers[name]);
+      }, this);
+    }
+  }
+
+  Headers.prototype.append = function(name, value) {
+    name = normalizeName(name);
+    value = normalizeValue(value);
+    var oldValue = this.map[name];
+    this.map[name] = oldValue ? oldValue + ', ' + value : value;
+  };
+
+  Headers.prototype['delete'] = function(name) {
+    delete this.map[normalizeName(name)];
+  };
+
+  Headers.prototype.get = function(name) {
+    name = normalizeName(name);
+    return this.has(name) ? this.map[name] : null
+  };
+
+  Headers.prototype.has = function(name) {
+    return this.map.hasOwnProperty(normalizeName(name))
+  };
+
+  Headers.prototype.set = function(name, value) {
+    this.map[normalizeName(name)] = normalizeValue(value);
+  };
+
+  Headers.prototype.forEach = function(callback, thisArg) {
+    for (var name in this.map) {
+      if (this.map.hasOwnProperty(name)) {
+        callback.call(thisArg, this.map[name], name, this);
+      }
+    }
+  };
+
+  Headers.prototype.keys = function() {
+    var items = [];
+    this.forEach(function(value, name) {
+      items.push(name);
+    });
+    return iteratorFor(items)
+  };
+
+  Headers.prototype.values = function() {
+    var items = [];
+    this.forEach(function(value) {
+      items.push(value);
+    });
+    return iteratorFor(items)
+  };
+
+  Headers.prototype.entries = function() {
+    var items = [];
+    this.forEach(function(value, name) {
+      items.push([name, value]);
+    });
+    return iteratorFor(items)
+  };
+
+  if (support.iterable) {
+    Headers.prototype[Symbol.iterator] = Headers.prototype.entries;
+  }
+
+  function consumed(body) {
+    if (body.bodyUsed) {
+      return Promise.reject(new TypeError('Already read'))
+    }
+    body.bodyUsed = true;
+  }
+
+  function fileReaderReady(reader) {
+    return new Promise(function(resolve, reject) {
+      reader.onload = function() {
+        resolve(reader.result);
+      };
+      reader.onerror = function() {
+        reject(reader.error);
+      };
+    })
+  }
+
+  function readBlobAsArrayBuffer(blob) {
+    var reader = new FileReader();
+    var promise = fileReaderReady(reader);
+    reader.readAsArrayBuffer(blob);
+    return promise
+  }
+
+  function readBlobAsText(blob) {
+    var reader = new FileReader();
+    var promise = fileReaderReady(reader);
+    reader.readAsText(blob);
+    return promise
+  }
+
+  function readArrayBufferAsText(buf) {
+    var view = new Uint8Array(buf);
+    var chars = new Array(view.length);
+
+    for (var i = 0; i < view.length; i++) {
+      chars[i] = String.fromCharCode(view[i]);
+    }
+    return chars.join('')
+  }
+
+  function bufferClone(buf) {
+    if (buf.slice) {
+      return buf.slice(0)
+    } else {
+      var view = new Uint8Array(buf.byteLength);
+      view.set(new Uint8Array(buf));
+      return view.buffer
+    }
+  }
+
+  function Body() {
+    this.bodyUsed = false;
+
+    this._initBody = function(body) {
+      /*
+        fetch-mock wraps the Response object in an ES6 Proxy to
+        provide useful test harness features such as flush. However, on
+        ES5 browsers without fetch or Proxy support pollyfills must be used;
+        the proxy-pollyfill is unable to proxy an attribute unless it exists
+        on the object before the Proxy is created. This change ensures
+        Response.bodyUsed exists on the instance, while maintaining the
+        semantic of setting Request.bodyUsed in the constructor before
+        _initBody is called.
+      */
+      this.bodyUsed = this.bodyUsed;
+      this._bodyInit = body;
+      if (!body) {
+        this._bodyText = '';
+      } else if (typeof body === 'string') {
+        this._bodyText = body;
+      } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
+        this._bodyBlob = body;
+      } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
+        this._bodyFormData = body;
+      } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
+        this._bodyText = body.toString();
+      } else if (support.arrayBuffer && support.blob && isDataView(body)) {
+        this._bodyArrayBuffer = bufferClone(body.buffer);
+        // IE 10-11 can't handle a DataView body.
+        this._bodyInit = new Blob([this._bodyArrayBuffer]);
+      } else if (support.arrayBuffer && (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))) {
+        this._bodyArrayBuffer = bufferClone(body);
+      } else {
+        this._bodyText = body = Object.prototype.toString.call(body);
+      }
+
+      if (!this.headers.get('content-type')) {
+        if (typeof body === 'string') {
+          this.headers.set('content-type', 'text/plain;charset=UTF-8');
+        } else if (this._bodyBlob && this._bodyBlob.type) {
+          this.headers.set('content-type', this._bodyBlob.type);
+        } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
+          this.headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8');
+        }
+      }
+    };
+
+    if (support.blob) {
+      this.blob = function() {
+        var rejected = consumed(this);
+        if (rejected) {
+          return rejected
+        }
+
+        if (this._bodyBlob) {
+          return Promise.resolve(this._bodyBlob)
+        } else if (this._bodyArrayBuffer) {
+          return Promise.resolve(new Blob([this._bodyArrayBuffer]))
+        } else if (this._bodyFormData) {
+          throw new Error('could not read FormData body as blob')
+        } else {
+          return Promise.resolve(new Blob([this._bodyText]))
+        }
+      };
+
+      this.arrayBuffer = function() {
+        if (this._bodyArrayBuffer) {
+          var isConsumed = consumed(this);
+          if (isConsumed) {
+            return isConsumed
+          }
+          if (ArrayBuffer.isView(this._bodyArrayBuffer)) {
+            return Promise.resolve(
+              this._bodyArrayBuffer.buffer.slice(
+                this._bodyArrayBuffer.byteOffset,
+                this._bodyArrayBuffer.byteOffset + this._bodyArrayBuffer.byteLength
+              )
+            )
+          } else {
+            return Promise.resolve(this._bodyArrayBuffer)
+          }
+        } else {
+          return this.blob().then(readBlobAsArrayBuffer)
+        }
+      };
+    }
+
+    this.text = function() {
+      var rejected = consumed(this);
+      if (rejected) {
+        return rejected
+      }
+
+      if (this._bodyBlob) {
+        return readBlobAsText(this._bodyBlob)
+      } else if (this._bodyArrayBuffer) {
+        return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))
+      } else if (this._bodyFormData) {
+        throw new Error('could not read FormData body as text')
+      } else {
+        return Promise.resolve(this._bodyText)
+      }
+    };
+
+    if (support.formData) {
+      this.formData = function() {
+        return this.text().then(decode)
+      };
+    }
+
+    this.json = function() {
+      return this.text().then(JSON.parse)
+    };
+
+    return this
+  }
+
+  // HTTP methods whose capitalization should be normalized
+  var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT'];
+
+  function normalizeMethod(method) {
+    var upcased = method.toUpperCase();
+    return methods.indexOf(upcased) > -1 ? upcased : method
+  }
+
+  function Request(input, options) {
+    if (!(this instanceof Request)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
+
+    options = options || {};
+    var body = options.body;
+
+    if (input instanceof Request) {
+      if (input.bodyUsed) {
+        throw new TypeError('Already read')
+      }
+      this.url = input.url;
+      this.credentials = input.credentials;
+      if (!options.headers) {
+        this.headers = new Headers(input.headers);
+      }
+      this.method = input.method;
+      this.mode = input.mode;
+      this.signal = input.signal;
+      if (!body && input._bodyInit != null) {
+        body = input._bodyInit;
+        input.bodyUsed = true;
+      }
+    } else {
+      this.url = String(input);
+    }
+
+    this.credentials = options.credentials || this.credentials || 'same-origin';
+    if (options.headers || !this.headers) {
+      this.headers = new Headers(options.headers);
+    }
+    this.method = normalizeMethod(options.method || this.method || 'GET');
+    this.mode = options.mode || this.mode || null;
+    this.signal = options.signal || this.signal;
+    this.referrer = null;
+
+    if ((this.method === 'GET' || this.method === 'HEAD') && body) {
+      throw new TypeError('Body not allowed for GET or HEAD requests')
+    }
+    this._initBody(body);
+
+    if (this.method === 'GET' || this.method === 'HEAD') {
+      if (options.cache === 'no-store' || options.cache === 'no-cache') {
+        // Search for a '_' parameter in the query string
+        var reParamSearch = /([?&])_=[^&]*/;
+        if (reParamSearch.test(this.url)) {
+          // If it already exists then set the value with the current time
+          this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime());
+        } else {
+          // Otherwise add a new '_' parameter to the end with the current time
+          var reQueryString = /\?/;
+          this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime();
+        }
+      }
+    }
+  }
+
+  Request.prototype.clone = function() {
+    return new Request(this, {body: this._bodyInit})
+  };
+
+  function decode(body) {
+    var form = new FormData();
+    body
+      .trim()
+      .split('&')
+      .forEach(function(bytes) {
+        if (bytes) {
+          var split = bytes.split('=');
+          var name = split.shift().replace(/\+/g, ' ');
+          var value = split.join('=').replace(/\+/g, ' ');
+          form.append(decodeURIComponent(name), decodeURIComponent(value));
+        }
+      });
+    return form
+  }
+
+  function parseHeaders(rawHeaders) {
+    var headers = new Headers();
+    // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
+    // https://tools.ietf.org/html/rfc7230#section-3.2
+    var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, ' ');
+    preProcessedHeaders.split(/\r?\n/).forEach(function(line) {
+      var parts = line.split(':');
+      var key = parts.shift().trim();
+      if (key) {
+        var value = parts.join(':').trim();
+        headers.append(key, value);
+      }
+    });
+    return headers
+  }
+
+  Body.call(Request.prototype);
+
+  function Response(bodyInit, options) {
+    if (!(this instanceof Response)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
+    if (!options) {
+      options = {};
+    }
+
+    this.type = 'default';
+    this.status = options.status === undefined ? 200 : options.status;
+    this.ok = this.status >= 200 && this.status < 300;
+    this.statusText = 'statusText' in options ? options.statusText : '';
+    this.headers = new Headers(options.headers);
+    this.url = options.url || '';
+    this._initBody(bodyInit);
+  }
+
+  Body.call(Response.prototype);
+
+  Response.prototype.clone = function() {
+    return new Response(this._bodyInit, {
+      status: this.status,
+      statusText: this.statusText,
+      headers: new Headers(this.headers),
+      url: this.url
+    })
+  };
+
+  Response.error = function() {
+    var response = new Response(null, {status: 0, statusText: ''});
+    response.type = 'error';
+    return response
+  };
+
+  var redirectStatuses = [301, 302, 303, 307, 308];
+
+  Response.redirect = function(url, status) {
+    if (redirectStatuses.indexOf(status) === -1) {
+      throw new RangeError('Invalid status code')
+    }
+
+    return new Response(null, {status: status, headers: {location: url}})
+  };
+
+  exports.DOMException = global.DOMException;
+  try {
+    new exports.DOMException();
+  } catch (err) {
+    exports.DOMException = function(message, name) {
+      this.message = message;
+      this.name = name;
+      var error = Error(message);
+      this.stack = error.stack;
+    };
+    exports.DOMException.prototype = Object.create(Error.prototype);
+    exports.DOMException.prototype.constructor = exports.DOMException;
+  }
+
+  function fetch(input, init) {
+    return new Promise(function(resolve, reject) {
+      var request = new Request(input, init);
+
+      if (request.signal && request.signal.aborted) {
+        return reject(new exports.DOMException('Aborted', 'AbortError'))
+      }
+
+      var xhr = new XMLHttpRequest();
+
+      function abortXhr() {
+        xhr.abort();
+      }
+
+      xhr.onload = function() {
+        var options = {
+          status: xhr.status,
+          statusText: xhr.statusText,
+          headers: parseHeaders(xhr.getAllResponseHeaders() || '')
+        };
+        options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL');
+        var body = 'response' in xhr ? xhr.response : xhr.responseText;
+        setTimeout(function() {
+          resolve(new Response(body, options));
+        }, 0);
+      };
+
+      xhr.onerror = function() {
+        setTimeout(function() {
+          reject(new TypeError('Network request failed'));
+        }, 0);
+      };
+
+      xhr.ontimeout = function() {
+        setTimeout(function() {
+          reject(new TypeError('Network request failed'));
+        }, 0);
+      };
+
+      xhr.onabort = function() {
+        setTimeout(function() {
+          reject(new exports.DOMException('Aborted', 'AbortError'));
+        }, 0);
+      };
+
+      function fixUrl(url) {
+        try {
+          return url === '' && global.location.href ? global.location.href : url
+        } catch (e) {
+          return url
+        }
+      }
+
+      xhr.open(request.method, fixUrl(request.url), true);
+
+      if (request.credentials === 'include') {
+        xhr.withCredentials = true;
+      } else if (request.credentials === 'omit') {
+        xhr.withCredentials = false;
+      }
+
+      if ('responseType' in xhr) {
+        if (support.blob) {
+          xhr.responseType = 'blob';
+        } else if (
+          support.arrayBuffer &&
+          request.headers.get('Content-Type') &&
+          request.headers.get('Content-Type').indexOf('application/octet-stream') !== -1
+        ) {
+          xhr.responseType = 'arraybuffer';
+        }
+      }
+
+      if (init && typeof init.headers === 'object' && !(init.headers instanceof Headers)) {
+        Object.getOwnPropertyNames(init.headers).forEach(function(name) {
+          xhr.setRequestHeader(name, normalizeValue(init.headers[name]));
+        });
+      } else {
+        request.headers.forEach(function(value, name) {
+          xhr.setRequestHeader(name, value);
+        });
+      }
+
+      if (request.signal) {
+        request.signal.addEventListener('abort', abortXhr);
+
+        xhr.onreadystatechange = function() {
+          // DONE (success or failure)
+          if (xhr.readyState === 4) {
+            request.signal.removeEventListener('abort', abortXhr);
+          }
+        };
+      }
+
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
+    })
+  }
+
+  fetch.polyfill = true;
+
+  if (!global.fetch) {
+    global.fetch = fetch;
+    global.Headers = Headers;
+    global.Request = Request;
+    global.Response = Response;
+  }
+
+  exports.Headers = Headers;
+  exports.Request = Request;
+  exports.Response = Response;
+  exports.fetch = fetch;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));