Load Testing Server-Sent Events (SSE)

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Overview

Server-Sent Events (SSE) provide a unidirectional stream of updates from server to client over HTTP. LoadForge supports SSE testing via Locust by leveraging HTTP streaming and the sseclient library.

Locust Test Script (locust.py)

# locust.py
import time
from locust import HttpUser, between, task
import sseclient

class SseUser(HttpUser):
    wait_time = between(1, 3)
    host = "https://example.com"

    @task
    def listen_events(self):
        with self.client.get("/events", name="SSE Stream", stream=True) as response:
            client = sseclient.SSEClient(response)
            # Read a few events
            for event in client.events():
                print(event.data)
                break

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Notes:

• Install dependencies: pip install locust sseclient if you wish to test locally.
• Ensure your SSE endpoint is accessible via host + /events.