Past Sessions | Steel.dev Docs Mirror

Steel automatically records every session so you can replay it later.
With the new headful session recordings, you can now embed real MP4 playback — no event reconstruction, no missing UI elements.

For older implementations, we still support headless playback via rrweb.

Embed Headful Session Recordings (Recommended)

What Changed

Steel has moved from slow, unreliable screencasting and event-based playback to full OS-level streaming and MP4 recordings.

25fps WebRTC-based video streaming
MP4 recordings showing the exact screen output
No discrepancies between actual sessions and replays

Tip: Headful sessions are now default for all Steel sessions.
No changes are needed to your integration — this gives you direct control over embedding playback.

Retrieving the Recording Playlist

This returns an HLS playlist that can be used in any compatible video player.

Embedding in a Web Page

html

<!doctype html>
<html>
  <body>
    <video id="player" controls playsinline style="width:100%;max-width:900px;"></video>

    <script type="module">
      import Hls from "https://cdn.jsdelivr.net/npm/hls.js@^1.5.0/dist/hls.mjs";
      const sessionId = "e4d682bb-a7f2-432c-ad13-8b116695d59e";
      const API_KEY = "YOUR_API_KEY";
      const manifestUrl = `https://api.steel.dev/v1/sessions/${sessionId}/hls`;
      const video = document.getElementById("player");

      if (Hls.isSupported()) {
        const hls = new Hls({
          xhrSetup: (xhr) => {
            xhr.setRequestHeader("steel-api-key", API_KEY);
          }
        });
        hls.loadSource(manifestUrl);
        hls.attachMedia(video);
      } else if (video.canPlayType("application/vnd.apple.mpegurl")) {
        video.src = manifestUrl;
      } else {
        video.outerHTML = "<p>Your browser does not support HLS.</p>";
      }
    </script>
  </body>
</html>

Notes:

Works with any HLS-compatible player (e.g., Safari, HLS.js, JW Player, Video.js).
Recordings are durable MP4 streams for accurate, 1:1 playback.

Headless

Headless playback is supported for legacy sessions.
New sessions use headful replays for full visual fidelity — we recommend migrating when possible.

Overview

Every Steel browser session records page events.
You can fetch those events from the /v1/sessions/:id/events endpoint and replay them using rrweb-player.

Retrieve the Recorded Events

SDK Example

const events = await client.sessions.events(session.id);

python

events = client.sessions.events(session_id=session.id)

Direct API

text

GET /v1/sessions/:id/events

Replay with rrweb-player

Install

bash

npm install rrweb-player

Usage

import rrwebPlayer from "rrweb-player";
import "rrweb-player/dist/style.css";

const events = await client.sessions.events(session.id);
const playerElement = document.getElementById("player-container");

new rrwebPlayer({
  target: playerElement,
  props: {
    events: events,
    width: 800,
    height: 600,
    autoPlay: true,
    skipInactive: true
  }
});

HTML

html

<div id="player-container"></div>

Summary

All new sessions now run headful by default.
Headless event-based playback remains available for legacy recordings but will be deprecated in the future.
Use headful recordings for the most accurate, reliable replays.

Embed Headful Session Recordings (Recommended) ​

What Changed ​

Retrieving the Recording Playlist ​

Embedding in a Web Page ​

Headless ​

Overview ​

Retrieve the Recorded Events ​

Replay with rrweb-player ​

Summary ​