text: # Copyright 2018 Espressif Systems (Shanghai) PTE LTD
  #
  # 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
  #
  #     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.
  #
  
  from __future__ import print_function
  from future.utils import tobytes
  
  import socket
  try:
      from http.client import HTTPConnection, HTTPSConnection
  except ImportError:
      # Python 2 fallback
      from httplib import HTTPConnection, HTTPSConnection
  
  from .transport import Transport
  
  
  class Transport_HTTP(Transport):
      def __init__(self, hostname, ssl_context=None):
          try:
              socket.gethostbyname(hostname.split(':')[0])
          except socket.gaierror:
              raise RuntimeError("Unable to resolve hostname :" + hostname)
  
          if ssl_context is None:
              self.conn = HTTPConnection(hostname, timeout=30)
          else:
              self.conn = HTTPSConnection(hostname, context=ssl_context, timeout=30)
          try:
              print("Connecting to " + hostname)
              self.conn.connect()
          except Exception as err:
              raise RuntimeError("Connection Failure : " + str(err))
          self.headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
  
      def _send_post_request(self, path, data):
          try:
              self.conn.request("POST", path, tobytes(data), self.headers)
              response = self.conn.getresponse()
              if response.status == 200:
                  return response.read().decode('latin-1')
          except Exception as err:
              raise RuntimeError("Connection Failure : " + str(err))
          raise RuntimeError("Server responded with error code " + str(response.status))
  
      def send_data(self, ep_name, data):
          return self._send_post_request('/' + ep_name, data)
  