anchor.diff:  , buildPythonPackage
   , pythonOlder
   , fetchFromGitHub
  -, brotli
  +, brotlicffi
   , certifi
   , h2
   , httpcore
  
positive.code: , pytestCheckHook
  , pytest-asyncio
  , pytest-trio
  , pytest-cov
  , trustme
  , uvicorn
  }:
  
  buildPythonPackage rec {
    pname = "httpx";
    version = "0.18.0";
    disabled = pythonOlder "3.6";
  
    src = fetchFromGitHub {
      owner = "encode";
      repo = pname;
      rev = version;
      sha256 = "sha256-6EYBTRXaVHBgW/JzZvWLz55AqgocOyym2FVtu2Nkp/U=";
    };
  
    propagatedBuildInputs = [
      brotli
      certifi
      h2
      httpcore
  
negative.code:     pytestCheckHook
      pytest-asyncio
      pytest-trio
      trustme
      typing-extensions
      uvicorn
    ];
  
  