GET https://api.steampowered.com/ICMSService/GetCDNAuthToken/v1/
GET https://api.steampowered.com/ISteamApps/UpToDateCheck/v1/ steam api init download
{ "response": { "token": "ABC123XYZ789...", "expiration": 1704067200 } } This token is your key. It is short-lived (usually 10-30 minutes). Without it, Step 2 fails immediately. You don't download the game files directly; you download a manifest . A manifest is a binary blob (or protobuf) containing the directory tree, file hashes (SHA-1), and chunk sizes. GET https://api
# The download is now initialized response = requests.get(chunk_url, headers=headers, stream=True) file hashes (SHA-1)