Quick Test Commands Test the Improved Error Message Windows CMD: python -m httpie POST https://httpbin.org/post "data:={\"bad json\"}" Windows PowerShell: python -m httpie POST https://httpbin.org/post "data:={\"bad json\"}" What you should see: http: error: 'data:={"bad json"}': Invalid JSON provided in request body. Check your quotes, commas, and brackets. Example: data:='{"name": "John"}' Verify Exit Code (PowerShell): python -m httpie POST https://httpbin.org/post "data:={\"bad json\"}" $LASTEXITCODE # Should show 1 Verify Exit Code (CMD): python -m httpie POST https://httpbin.org/post "data:={\"bad json\"}" echo %ERRORLEVEL% # Should show 1 Test Valid JSON (should work normally): python -m httpie POST https://httpbin.org/post "data:={\"name\": \"John\", \"age\": 30}"