This is a sublime-syntax grammar for HTTP Requests and/or Responses. It was originally designed for use in https://github.com/sharkdp/bat, so it is not using any Sublime Text 4 features, as https://github.com/trishume/syntect does not support them yet. So this package should work in Sublime Text 3 also.
Example highlighting:
