API versioning strategies in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is API versioning and why is it important?

API versioning is a way to manage changes in an API over time. It helps keep old clients working while allowing new features or fixes in newer versions. This avoids breaking apps that use the API.

beginner

Name three common API versioning strategies.

1. URL path versioning (e.g., /v1/resource)<br>2. Query parameter versioning (e.g., /resource?version=1)<br>3. Header versioning (using custom headers like 'Accept-Version')

intermediate

How does URL path versioning work in FastAPI?

You include the version number in the URL path, like '/v1/items'. In FastAPI, you create separate routers for each version and include them with different prefixes.

intermediate

What is a benefit of header versioning over URL versioning?

Header versioning keeps URLs clean and stable. Clients specify the version in HTTP headers, so the URL stays the same. This can be better for caching and hides version details from the URL.

intermediate

How can you implement query parameter versioning in FastAPI?

You add a query parameter like '?version=1' to your endpoints. In FastAPI, you read this parameter in your path operation function and route logic based on its value.

Which API versioning strategy includes the version number in the URL path?

A Content negotiation

B Header versioning

C URL path versioning

D Query parameter versioning

URL path versioning puts the version directly in the URL, like '/v1/resource'.

In FastAPI, how do you typically separate different API versions using URL path versioning?

A Use different HTTP methods

B Use different routers with version prefixes

C Use query parameters only

D Use environment variables

FastAPI uses routers with prefixes like '/v1' and '/v2' to separate versions.

What is a downside of using query parameter versioning?

A It requires custom headers

B It is not supported by FastAPI

C It breaks REST principles

D It can clutter URLs and caching may be less efficient

Query parameters can clutter URLs and may cause caching issues.

Which header is commonly used for header versioning in APIs?

A Accept-Version

B Content-Type

C Authorization

D User-Agent

'Accept-Version' is a common custom header to specify API version.

Why is API versioning important?

A To avoid breaking existing clients when API changes

B To speed up API responses

C To reduce server costs

D To encrypt API data

Versioning helps keep old clients working while allowing API improvements.

Explain three common API versioning strategies and how you might implement them in FastAPI.

Think about how the version info is passed: in the URL, query, or headers.

Describe the advantages and disadvantages of URL path versioning versus header versioning.

Consider URL clarity and client ease of use.