[Python] Cannot access any endpoint apart from localhost in Python FastAPI

I am learning to use FastAPI on Windows. The problem is that I cannot access any endpoint rather than localhost ("/").

I have written the following code in main.py file that is located inside app folder (app folder contains __init__.py file and main.py file):

from fastapi import FastAPI

app = FastAPI()

my_posts = { 1:{
"date":"01/01/2022",
"user":"Matt",
"type":"photo"
}
}

@app.get("/")
def get_root():
return{"Hello":"User"} #works fine


@app.get("/post/{post_id}")
def get_post(post_id:int):
return{"data": my_posts} #doesn't work




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