text/*

text/event-stream

The MIME type for Server-Sent Events (SSE) streams.

What is text/event-stream?

text/event-stream is the required Content-Type for Server-Sent Events endpoints consumed by EventSource in the browser. Each event is a chunk of text separated by blank lines.

Typical usage

Streaming updates from server to client — notifications, live tickers, LLM streaming.

Common gotchas

SSE responses must not be gzipped by intermediaries or the stream will buffer. Also disable proxy buffering (X-Accel-Buffering: no on nginx).

HTTP header example

Response header

Content-Type: text/event-stream; charset=utf-8

Reference

HTML Living Standard — Server-Sent Events

Related MIME types

text/plain

Plain text

text/html

HTML

text/css

CSS

text/javascript

JavaScript

text/csv

CSV

text/xml

XML (text form)