content: /**
   * Copyright 2019, OpenCensus Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import React from 'react';
  import ReactDOM from 'react-dom';
  import App from './App';
  import SecondPage from './SecondPage';
  import { startTracing } from '@opencensus/web-instrumentation-zone';
  
  import { Route, BrowserRouter as Router, Link } from 'react-router-dom'
  
  const routing = (
      <Router>
          <div>
              <ul>
                  <li>
                      <Link to="/">Home</Link>
                  </li>
                  <li>
                      <Link to="/second_page">Second Page</Link>
                  </li>
              </ul>
              <Route exact path="/" component={App} />
              <Route path="/second_page" component={SecondPage} />
          </div>
      </Router>
  )
  
  ReactDOM.render(routing, document.getElementById('root'));
  
  window.ocAgent = 'http://localhost:55678';
  // For the purpose of this example, send trace header to all hosts.
  window.ocTraceHeaderHostRegex = /.*/;
  window.ocSampleRate = 1.0; // Sample at 100% for test only. Default is 1/10000.
  
  startTracing();