text: #
  # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You 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
  #
  #     http://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 requests
  
  from skywalking.decorators import runnable
  
  if __name__ == '__main__':
      from flask import Flask, jsonify
  
      app = Flask(__name__)
  
      @app.route('/users', methods=['POST', 'GET'])
      def application():
          from skywalking.trace.context import get_context
          get_context().put_correlation('correlation', 'correlation')
  
          @runnable(op='/test')
          def post():
              requests.post('http://provider:9091/users', timeout=5)
  
          from threading import Thread
          t = Thread(target=post)
          t.start()
  
          res = requests.post('http://provider:9091/users', timeout=5)
  
          t.join()
  
          return jsonify(res.json())
  
      PORT = 9090
      app.run(host='0.0.0.0', port=PORT, debug=True)
  