Add Integration Benchmark tests for performance analysis of API-Manager

[Jithmi004]

Description

Problem

To assess the CPU usage and Memory consumption of API-Manager, a set of benchmark tests should be introduced.

Solution

• Implement SSL servers that send responses with different status codes and different response bodies
• Add a handler to processes incoming HTTP requests
• Implement SSLClient that sends requests to the API-Manager
• Add simpleblocking and nonblocking type SSLClients to create different scenarios
• Implement a test case where an API is created with the SSLServer as the backend
• Add Tests for following scenarios

1. Client send the full request content
2. Client sends less content than mentioned in the content-length header and server sends immediate response without payload
3. Client sends less content than mentioned in the content-length header

Version

APIM - 4.4.0

[Jithmi004]

Update - 2024/08/08

Added initial work for tests with custom python backend server

[Jithmi004]

Update - 2024/08/09

Added an HTTP server as the backend server

[Jithmi004]

Update - 2024/08/11

Added an SSL Server as a backend server

[Jithmi004]

Update - 2024/08/14

Added a SSL socket backend server : Some tests are failing

[Jithmi004]

Update - 2024/08/21

Added a https backend with a separate handler class to handle requests and added a POST resource for the SSL Server

[Jithmi004]

Update - 2024/08/22

Added a SSL client and finished end to end: yet to add server closing and added the tests for simplenonblocking client

[Jithmi004]

Update - 2024/08/26

Added all the tests and handled the socket closure exception

[Jithmi004]

Update - 2024/08/27

Added all the tests and handled the socket closure exception