Python Classroom notes 21/May/2026

API Versioning and API Routers

• When we provide apis we need to ensure our changes would not impact existing consumers.

• What if i want to develop a better apis. This is where api versioning will help

• You have an endpoint which is /products we will expose to the consumers as

/v1/products

• Find out in fast api how to add /v1 to existing routes.

@app.post("/products")

• Refer Here for the changes done to include routers

• Refer Here for setting status codes

• If my request schema and response schema for the same resource is differnt how to handle it.

• To solve this we use RequestModel and Response Model Seperately Refer Here for the changes.