server-sent-events

id	SKL-server-SERVERSENTEVENTS
name	Server Sent Events
description	Server-Sent Events (SSE) enable servers to push updates to clients over HTTP. This guide covers implementation, use cases, and best practices for building real-time features using unidirectional event
version	1.0.0
status	active
owner	@cerebra-team
last_updated	2026-02-22
category	Backend
tags	["api","backend","server","database"]
stack	["Python","Node.js","REST API","GraphQL"]
difficulty	Intermediate

Server Sent Events

Skill Profile

(Select at least one profile to enable specific modules)

• DevOps
• Backend
• Frontend
• AI-RAG
• Security Critical

Overview

Server-Sent Events (SSE) enable servers to push updates to clients over HTTP. This guide covers implementation, use cases, and best practices for building real-time features using unidirectional event streams.

Why This Matters

• Simplicity: Built on HTTP, no WebSocket complexity
• Reliability: Automatic reconnection built-in
• Compatibility: Works through firewalls and proxies
• Efficiency: Less overhead than polling

---

Core Concepts & Rules

1. Core Principles

• Follow established patterns and conventions
• Maintain consistency across codebase
• Document decisions and trade-offs

2. Implementation Guidelines

• Start with the simplest viable solution
• Iterate based on feedback and requirements
• Test thoroughly before deployment

Inputs / Outputs / Contracts

• Inputs:
  • Event endpoint URL
  • Authentication token (optional)
  • Event types and data formats
  • Update interval or trigger conditions
• Entry Conditions:
  • HTTP server configured
  • Event sources connected
  • Client EventSource API available
  • Authentication system in place
• Outputs:
  • Real-time event stream
  • Connection status updates
  • Event data to clients
  • Error notifications
• Artifacts Required (Deliverables):
  • SSE server implementation
  • SSE client hook
  • Event streaming service
  • Connection management