The Example consists of HTTPD server persistent sockets demo. This sort of persistency enables the server to have independent sessions/contexts per client.

Open the project configuration menu (idf.py menuconfig) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in examples/protocols/README.md for more details.
In order to test the HTTPD server persistent sockets demo :
1. compile and burn the firmware idf.py -p PORT flash
2. run idf.py -p PORT monitor and note down the IP assigned to your ESP module. The default port is 80
3. run the test script "python scripts/adder.py <IP> <port> <N>"
  - the provided test script sends (POST) numbers from 1 to N to the server which has a URI POST handler for adding these numbers into an accumulator that is valid throughout the lifetime of the connection socket, hence persistent
  - the script does a GET before closing and displays the final value of the accumulator

See the README.md file in the upper level 'examples' directory for more information about examples.