When I try to launch the html address of the app it does not got triggered in the browser while on the terminal it does

I was working an app on the visual studio code. But don’t know suddenly when I try to run the code it works fine on the terminal but in the case of the browser it just did not triggered. I even tried to uninstall and install the VScode but nothing happened. Can somebody help me regarding this. I have been trying this for the last few days

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This is what I am getting on the browser side