Ceen 0.9.9 crashing on large upload requests

[0xShkk]

Hi,

when serving content with ceen via HTTPS and sending a large multipart form request to it, it crashes silently.
The browser tells that there was a connection error.

File upload requests around ~2.5Mb are fine, but crashes stat to happen from 6Mb on.

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[kenkendk]

I have just fixed a few errors around multipart upload (823a456) and this hopefully fixes the problem you see as well.