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How to mock Server-Sent Events (SSE) in Python

A minimal HTTP server that streams Server-Sent Events to clients, perfect for testing and development.

from http.server import HTTPServer, BaseHTTPRequestHandler
import threading
import time

MESSAGES = iter([
    "data: Hello world\n\n",
    "data: Second message\n\n",
    "event: custom\n",
    "data: Custom event payload\n\n",
    "data: Final message\n\n"
])

class SSEHandler(BaseHTTPRequestHandler):
    def do_GET…

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