Intentionally bad HTTP clients for testing

What are good "bad HTTP client"-s I can use to test your HTTP servers?

For instance, there are servers like

1. https://httpbin.org/
2. https://badssl.com/

which allow you to test client against different, sometimes intentionally bad, behavior.

I seek for HTTP client utility for testing HTTP servers. It may send wrong Content-Length or close connection in the middle of request, or do other bad things which robust HTTP server should handle.