THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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I think I would have preferred that the REST API implemented RFC 7233 Ranges, and the REST API have the responsibility to chunk the response from getMessageContent. Chunks would not necessarily be syntactically valid JSON. If the The client would need to intercept the "206 Partial Content" response and know that the response is incomplete. In this case, the client would fallback back on showing a hex dump style preview of the raw content bytes itself.
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