[Python] FastAPI runs api-calls in serial instead of parallel fashion

I have the following code:

import time
from fastapi import FastAPI, Request

app = FastAPI()

@app.get("/ping")
async def ping(request: Request):
print("Hello")
time.sleep(5)
print("bye")
return {"ping": "pong!"}


If I run my code on localhost—e.g., http://localhost:8501/ping—in different tabs of the same browser window, I get:

Hello
bye
Hello
bye


instead of:

Hello
Hello
bye
bye


I have read about using httpx, but, still, I cannot have a true parallelization. What's the problem?

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