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Using Django 4.2's StreamingHttpResponse and HTMX SSE to provide real time notifications

Friday 3:30 PM–4:00 PM in Hall E

Part of the DjangoCon AU specialist track

Django 4.2 introduces a new way of streaming http responses with an ASGI server. Let's use this with HTMX to build a traditional web application that provides SPA-like real time notifications!

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Traditional web applications rely on the request-response model, and as a result can only display messages and notifications when the user interacts with the page in some, potentially delaying important information. How can we improve on this, to provide some of the responsiveness that has made SPA style applications so popular over the years?

Luckily, we have some great tools available these days, such as the HTMX library. And in Django 4.2, we can also use a StreamingHttpResponse to send Server Sent Events directly to HTMX to be inserted into the page in real-time.

In this talk, we'll walk through the background of Server Sent Events and how this feature works, and take a look at an example in a simple Django application, showing how notifications can be streamed from a Django view using StreamingHttpResponse, and rendered on the page in real-time using HTMX.

We'll also take a look at some of the challenges with this approach, including how to handle removal of notifications, and how to make this scale across multiple web server processes.

Dan Sloan he/him • @LucidDan@fosstodon.org

Dan has worked in tech for nearly 20 years, programming primarily in python for over a decade, and using Django for the last five. He has recently been working on refactoring a number of older applications into modern apps, using tools like HTMX and AlpineJS.

He enjoys sailing, reading fiction, and working remotely, preferably from warmer locations when winter sets in at home in Melbourne, Australia.