Introduction

CORS is a protocol that helps web applications bypass a security rule called Same-Origin Policy (SOP). SOP normally restricts web pages from making requests to resources on different domains. But in today's web, it's common to need resources from other domains.

In this guide, we'll explain what SOP is first. SOP is like a security guard for the web, ensuring that scripts from one domain can't access data from another domain.

Then, we'll dive into CORS. CORS acts as a secure bridge, allowing web pages to make cross-origin requests safely.

We'll talk about different types of CORS requests, like simple ones and preflight requests. And we'll discuss practical ways to use CORS in your web applications.

Overall, this guide aims to give you a clear understanding of CORS and how to use it effectively in your projects.