![python - access to XMLHttpRequest at 'http://127.0.0.1:5000/product' from origin 'http://localhost:3000' - Stack Overflow python - access to XMLHttpRequest at 'http://127.0.0.1:5000/product' from origin 'http://localhost:3000' - Stack Overflow](https://i.stack.imgur.com/rf6RK.png)
python - access to XMLHttpRequest at 'http://127.0.0.1:5000/product' from origin 'http://localhost:3000' - Stack Overflow
![c# - Visual Studio "No connection could be made because target machine actively refused it 127.0.0.1:8888" - Stack Overflow c# - Visual Studio "No connection could be made because target machine actively refused it 127.0.0.1:8888" - Stack Overflow](https://i.stack.imgur.com/kkrE4.png)
c# - Visual Studio "No connection could be made because target machine actively refused it 127.0.0.1:8888" - Stack Overflow
![Error downloading http://127.0.0.1:8000/openapi.json HTTP ERROR 500Something went wrong... on http://127.0.0.1:8000/redoc or /docs · Issue #2406 · tiangolo/fastapi · GitHub Error downloading http://127.0.0.1:8000/openapi.json HTTP ERROR 500Something went wrong... on http://127.0.0.1:8000/redoc or /docs · Issue #2406 · tiangolo/fastapi · GitHub](https://user-images.githubusercontent.com/67769279/100412657-46c03d80-309b-11eb-98d2-17f2ac67d5ec.png)
Error downloading http://127.0.0.1:8000/openapi.json HTTP ERROR 500Something went wrong... on http://127.0.0.1:8000/redoc or /docs · Issue #2406 · tiangolo/fastapi · GitHub
![Failed to bind to address https://127.0.0.1:5001: address already in use · Issue #2001 · dotnet/core · GitHub Failed to bind to address https://127.0.0.1:5001: address already in use · Issue #2001 · dotnet/core · GitHub](https://user-images.githubusercontent.com/20960425/67628913-7a071c00-f84c-11e9-8409-c22394ef5b38.png)
Failed to bind to address https://127.0.0.1:5001: address already in use · Issue #2001 · dotnet/core · GitHub
The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port? · Issue #5423 · k3s-io/k3s · GitHub
![c# - No connection could be made because the target machine actively refused it 127.0.0.1:3446 - Stack Overflow c# - No connection could be made because the target machine actively refused it 127.0.0.1:3446 - Stack Overflow](https://i.stack.imgur.com/JKNJf.png)