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LIMITS.md

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Iodine limits and settings

I will, at some point, document these... here's the key points:

SSL/TLS

  • TLS support requires OpenSSL 1.1.0 and above. On Heroku, this requires heroku-18.

  • Iodine supports TLS 1.2 and above (depending on the OpenSSL version used).

HTTP limits

  • Uploads are adjustable and limited to ~50Mib by default.

  • HTTP connection timeout (keep-alive) is adjustable and set to ~60 seconds by default.

  • HTTP total header size is adjustable and limited to ~32Kib by default.

  • HTTP header line length size is limited to a hard-coded limit of 8Kb.

  • HTTP headers count is limited to a hard-coded limit of 128 headers.

Websocket

  • Incoming Websocket message size limits are adjustable and limited to ~250Kib by default.

EventSource / SSE

  • Iodine will automatically attempt to send a ping event instead of disconnecting the connection. The ping interval is the same as the HTTP connection timeout interval.

Pub/Sub

  • Channel names are binary safe and unlimited in length. However, name lengths effect performance.

    Do NOT allow clients to dictate the channel name, as they might use extremely long names and cause resource starvation.

  • Pub/sub is limited to the process cluster. To use pub/sub with an external service (such as Redis) an "Engine" is required (see YARD documentation).

  • Pub/sub pattern matching supports only the Redis pattern matching approach. This makes patterns significantly more expensive and exact matches simpler and faster.

    It's recommended to prefer exact channel/stream name matching when possible.