feat: adding in http2 support

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
feat: adding in http2 support

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the MockHttp server by integrating HTTP/2 capabilities. This feature allows the mock server to simulate modern network environments, supporting both encrypted (h2) and unencrypted (h2c) HTTP/2 connections. This is particularly beneficial for testing applications that rely on HTTP/2, such as gRPC services or browser-based interactions, providing greater flexibility and realism in mock setups.

Highlights

• HTTP/2 Support: Introduced comprehensive HTTP/2 support, allowing the mock server to operate in both HTTP/2 over TLS (h2) and HTTP/2 cleartext (h2c) modes.
• Configuration Options: Added new configuration options http2 to enable HTTP/2 and http1 to control HTTP/1.1 fallback when using HTTP/2 with HTTPS.
• Environment Variable Support: Enabled HTTP/2 activation via the HTTP2 environment variable for easier deployment and testing.
• Documentation and Testing: Updated the README.md with detailed explanations and examples for HTTP/2 usage, and added extensive test coverage for the new functionality.

Changelog

• README.md
  • Added 'HTTP/2 Support' to the table of contents.
  • Included a new, detailed section explaining HTTP/2 support, its two modes (h2 and h2c), and configuration examples.
  • Updated the constructor options and properties documentation to reflect the new http2 and http1 parameters.
• src/index.ts
  • Implemented logic to enable HTTP/2 support if the HTTP2 environment variable is set to 'true'.
• src/mock-http.ts
  • Added http2 and http1 properties to the MockHttpOptions interface, along with their JSDoc comments.
  • Introduced private fields _http2 and _http1 with default values in the MockHttp class.
  • Updated the MockHttp constructor to process http2 and http1 options.
  • Added public getters and setters for http2, isHttp2, and http1 properties.
  • Modified the start method to conditionally initialize the Fastify server with HTTP/2 support, handling combinations of HTTPS and HTTP/1.1 fallback.
• test/mock-http.test.ts
  • Added a new test suite for HTTP/2 functionality.
  • Included tests for default http2 and http1 values.
  • Added tests for setting http2 and http1 via constructor options and through getters/setters.
  • Implemented integration tests to verify server startup and response handling with HTTP/2 enabled (h2c).
  • Added integration tests for HTTP/2 with HTTPS (h2), including scenarios with and without HTTP/1.1 fallback.
  • Included tests for HTTP/2 with custom PEM certificates.

Activity

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[gemini-code-assist]

Code Review

This pull request adds valuable HTTP/2 support, including both h2 and h2c modes, which is a great enhancement. The changes are well-documented in the README and thoroughly tested. I have a couple of suggestions in src/mock-http.ts to improve code clarity and maintainability by removing a redundant property and refactoring the server initialization logic. Overall, this is a solid contribution.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e0095d2) to head (d1da5c1).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           37        37           
  Lines         1044      1063   +19     
  Branches       208       211    +3     
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+ Hits          1044      1063   +19     

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