#Server-Sent Events (SSE)

#Overview

Cheolsu Proxy captures and analyzes Server-Sent Events (SSE) streams in real-time. SSE is a protocol for server-to-client unidirectional event delivery, widely used for AI chatbot streaming responses, real-time notifications, stock price updates, and more.

SSE responses are delivered with the text/event-stream Content-Type. Cheolsu Proxy automatically detects these and parses them into individual events.

#Event Structure

Each event is parsed according to the SSE standard:

Comments (lines starting with :) are handled separately and not included in event data.

#Key Features

#Connection List

Displays active and closed SSE connections in chronological order.

• Connected/disconnected status
• URI for each connection
• Number of received events

#Event Viewer

Shows all events for a selected connection in chronological order.

• Event type display: Classification by event field value
• Data content: JSON data is auto-formatted
• Sequence number: Event receipt order tracking
• Size information: Data size of each event

#Scripting Integration

Use the cheolsu.onSseEvent hook to programmatically process SSE events. Events can be modified or filtered (dropped).

#Use Cases

#AI Streaming Response Debugging

AI APIs like OpenAI and Claude send streaming responses via SSE. Inspect each chunk's content and timing to verify streaming UI behavior.

#Real-time Notification Verification

Examine event types, data, and ordering from the server to verify that notification systems work as intended.

#Usage

#Desktop

1. Select SSE from the sidebar
2. View SSE connection list in the left panel
3. Select a connection to see its events in the right panel
4. Select an event to view detailed data

#MCP

"Show me the SSE connection list"
"Check the recent SSE events"