Joe Cheng c2b3c3379d Fix #1824: HEAD request on static files causes app to stop (#1825) ...

* Fix #1824: HEAD request on static files causes app to stop

The problem was that for HEAD requests specifically, we implement
an explicit Content-Length header (normally we let httpuv figure
out the Content-Length based on the content, but for HEAD we don't
return any content but still want to include the Content-Length).

The Content-Length header was only implemented correctly for string
values, not for raw vectors or file-by-path. This change implements
the value correctly for all currently valid httpuv content.

* Update NEWS

* Code review feedback

2017-08-23 13:01:22 -05:00

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