Compile error and ChunkedReader bugfix

First commit: naiive fix for latest compile error: 
>    `HeaderFormatter` does not implement any method in scope named 'fmt_header`

Not sure if this was the intended behavior, but it makes the repo build again, which I'm sure everyone appreciates. 

Second commit: Attempting to read `ChunkedReader` after it returned EOF error will block to wait for more bytes. This simple change fuses it permanently.

I'd separate this into two PRs if I could figure out how to do it.