Introduction

Although the WebSocket protocol provides several opportunities for more direct communication between the client and the server, people often wonder if Socket.IO is actually as secure as something similar to the HTTP protocol. The answer to this question is that it depends entirely on how you implement it. WebSockets can be easily controlled to prevent malicious or accidental security holes, but with any API interface, your security is only as tight as your weakest link.

In this chapter, we will explore several topics related to security in Socket.IO applications. From authentication and validation to how to use the wss:// protocol for secure WebSockets, these topics will cover the entire gamut.