FASTAPI

What is FastAPI?

FastAPI is a modern Python framework used to build high-performance APIs and backend applications quickly and with less code

ASGI vs WSGI

Both WSGI and ASGI are standards that define how a Python web application communicates with a web server.

Think of them as a bridge between your Python code and incoming web requests.

WSGI (Web Server Gateway Interface)

WSGI is the older standard used by frameworks like:

• Flask
• Django (traditional mode)

Characteristics

✅ Simple

✅ Stable

✅ Good for traditional web applications

❌ Handles one request at a time (synchronous)

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❌ Not ideal for WebSockets and real-time apps

ASGI (Asynchronous Server Gateway Interface)

ASGI is the modern successor to WSGI.

Used by:

• FastAPI
• Starlette
• Django (async support)

Characteristics

✅ Supports Async/Await

✅ Supports WebSockets

✅ High Performance

✅ Handles thousands of concurrent requests

✅ Perfect for AI applications

the ASGI is implemenented by uvicorn server

so we need to install it first with fastapi

pip install uvicorn

import uvicorn
from fastapi import FastAPI

app=FastAPI()

@app.get("/")
def root():
    return "hello world!"
@app.get("/HomePage")
def root2(name:str):
    return {"my name is " : {name}}

if __name__=='__main__':
    uvicorn.run(app, host="127.0.0.0", port=8000)