user to parse the response text, why not simply allow each event to be a JSON-encoded object of some kind (boolean, number, string, array, object). Then the could be an object which was already conveniently accessible to JavaScript consumers. Presumably server-side libraries would handle the work of doing the encoding, but the average client-side consumer should, in my opinion, not need to be concerned with implementation details, except to become familiar with the specific JSON response types being sent by the server-side code/library.

Although this would add encoding responsibilities to the server and decoding responsibilities to the browser, I think it ought to avoid the need for the client code to be concerned with ugly implementation details such as the need to parse strings.

A convention might also be used in the stream (e.g., "error: " followed by a JSON object) to trigger errors, allowing the normal responses to be simple strings or the like, while offering a means to distinguish them from error messages sent by the server (e.g., to indicate that a data source was no longer available). The event object could add an "error" property which could be checked (or, if types were allowed as per my previous post, it could set the event type to the reserved string "error").


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