Path operations (GET, POST, PUT, DELETE) in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a GET path operation in FastAPI?

A GET path operation is used to retrieve data from the server. It responds to client requests by sending back information without changing anything on the server.

beginner

How does a POST path operation differ from GET in FastAPI?

POST is used to send data to the server to create a new resource. Unlike GET, POST changes the server state by adding new information.

intermediate

What is the purpose of a PUT path operation in FastAPI?

PUT is used to update an existing resource completely. It replaces the current data with the new data sent by the client.

beginner

Explain the DELETE path operation in FastAPI.

DELETE removes a resource from the server. When a client sends a DELETE request, the server deletes the specified data.

intermediate

Show a simple FastAPI example of a GET and POST path operation.

Example:
from fastapi import FastAPI
app = FastAPI()

@app.get("/items/{item_id}")
async def read_item(item_id: int):
    return {"item_id": item_id}

@app.post("/items/")
async def create_item(name: str):
    return {"name": name}

This shows GET to read and POST to create items.

Which HTTP method is used to retrieve data without changing the server state?

A GET

B POST

C PUT

D DELETE

GET requests fetch data and do not modify the server.

Which path operation method in FastAPI is typically used to create a new resource?

A GET

B POST

C PUT

D DELETE

POST sends data to create new resources on the server.

What does the PUT method do in FastAPI?

A Updates or replaces a resource

B Retrieves data

C Deletes a resource

D Creates a new resource

PUT replaces an existing resource with new data.

Which HTTP method should you use to remove a resource in FastAPI?

A POST

B PUT

C DELETE

D GET

DELETE removes the specified resource from the server.

In FastAPI, how do you define a GET path operation for the URL '/users/{user_id}'?

A @app.delete('/users/{user_id}')

B @app.post('/users/{user_id}')

C @app.put('/users/{user_id}')

D @app.get('/users/{user_id}')

GET method is defined with @app.get decorator.

Describe the four main HTTP methods used in FastAPI path operations and their typical uses.

Think about what each method does to the server data.

Write a simple FastAPI example showing how to create GET and DELETE path operations for a resource called 'item'.

Remember to define async functions with proper decorators.