headers don't get written if no content or status is written

[UnquietCode]

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The golang http server will write out on close, just in case nothing was written. Could the End() method be changed to call Write([]byte{}) so that it will trigger the headers and status OK being written?

This is using v2.0.0 of the library.

[UnquietCode]

I've just sent a PR with an example of what I mean. :+1: #39