anchor.diff:  
   buildPythonPackage rec {
     pname = "httpcore";
  -  version = "0.13.7";
  +  version = "0.14.3";
     disabled = pythonOlder "3.6";
   
     src = fetchFromGitHub {
       owner = "encode";
       repo = pname;
       rev = version;
  -    sha256 = "sha256-9hG9MqqEYMT2j7tXafToGYwHbJfp9/klNqZozHSbweE=";
  +    sha256 = "sha256-jPsbMhY1lWKBXlh6hsX6DGKXi/g7VQSU00tF6H7qkOo=";
     };
   
     propagatedBuildInputs = [
       anyio
  +    certifi
       h11
       h2
       sniffio
  
positive.code:     pytest-asyncio
      pytestCheckHook
      pytest-cov
      trio
      trustme
      uvicorn
    ];
  
    disabledTestPaths = [
      # these tests fail during dns lookups: httpcore.ConnectError: [Errno -2] Name or service not known
      "tests/test_threadsafety.py"
      "tests/async_tests/"
      "tests/sync_tests/test_interfaces.py"
      "tests/sync_tests/test_retries.py"
    ];
  
    pythonImportsCheck = [ "httpcore" ];
  
negative.code: , pythonOlder
  , fetchFromGitHub
  , anyio
  , certifi
  , h11
  , h2
  , pproxy
  , pytest-asyncio
  , pytestCheckHook
  , pytest-cov
  , pytest-httpbin
  , sniffio
  , trio
  , trustme
  