1. Brent Tubbs
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sseclient /

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Python SSE Client

This is a Python client library for iterating over http Server Sent Event (SSE) streams. The SSEClient class accepts a url on init, and is then an iterator over messages coming from the server.


Use pip:

pip install sseclient


from sseclient import SSEClient

messages = SSEClient('http://mysite.com/sse_stream/')
for msg in messages:

Each message object will have a 'data' attribute, as well as optional 'event', 'id', and 'retry' attributes.

Optional init parameters:

  • last_id: If provided, this parameter will be sent to the server to tell it to return only messages more recent than this ID.
  • retry: Number of milliseconds to wait after disconnects before attempting to reconnect. The server may change this by including a 'retry' line in a message. Retries are handled automatically by the SSEClient object.

You may also provide any additional keyword arguments supported by the Requests library, such as a 'headers' dict and a (username, password) tuple for 'auth'.


Install the test dependencies:

pip install pytest mock

And run the tests:

$ py.test
================== test session starts ===================
platform linux2 -- Python 2.7.3 -- pytest-2.3.4
collected 9 items

test_sseclient.py .........

================ 9 passed in 0.31 seconds ================

There are a couple TODO items in the code for getting the implementation completely in line with the finer points of the SSE spec.

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