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Iodine limits and settings

I will, at some point, document these... here's a few things:

HTTP/1.x limits

  • HTTP Headers have a ~16Kb total size limit.

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

  • HTTP keep-alive is adjustable and set to ~5 seconds by default.

Websocket

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

Pub/Sub

  • Channel names are binary safe, but limited to 1024 characters (even though Redis doesn't seem to limit channel name length).

    Iodine uses a trie to match channel names. A trie offers binary exact matching with a fast lookup (unlike hash lookups, this offers zero name collision risk). However, it also means that channel names are memory expensive.

    As a side effect, sequencial channel names have an advantage over random channel names.

  • 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).