Episode 98: Stefan Tilkov on REST

HTTP Methods

Efficient HTTP methods are crucial for building scalable RESTful applications. Stefan Tilkov explains that HTTP's core methods—GET, PUT, POST, and DELETE—each have specific semantics defined in the HTTP specification, which ensures a uniform interface for all resources 1. This uniformity allows developers to rely on predictable behaviors, such as the safety of GET requests, which should not have side effects or incur costs. Tilkov notes, "An HTTP GET will never oblige me to anything. I will not have to pay for it, I will not get an invoice two weeks later telling me that I have there. GET should be safe."

An HTTP GET will never oblige me to anything. I will not have to pay for it, I will not get an invoice two weeks later telling me that I have there. GET should be safe.

--- Stefan Tilkov

This predictability is a powerful concept, enabling developers to build robust systems that can handle a variety of operations efficiently.

   

Caching

Caching is a fundamental feature of HTTP that significantly enhances the scalability of RESTful systems. Stefan Tilkov highlights that HTTP's sophisticated caching mechanisms, such as conditional GETs and the use of ETags, prevent unnecessary data retrieval, thus optimizing performance 2. He emphasizes that caching is what makes the web scalable, allowing for efficient resource management. Tilkov states, "Caching is very sophisticated in HTTP and it's actually what makes the web so scalable."

Caching is very sophisticated in HTTP and it's actually what makes the web so scalable.

--- Stefan Tilkov

Additionally, HTTP provides a rich set of response codes that inform clients about resource states, further aiding in efficient application design 3.