Fix reading of HTTP body for HEAD requests
Fix reading of HTTP body for HEAD requests

A response to a HEAD request must not contain a body.
The current code tries to read and unzip the body even on HEAD requests.
This results in an EOF during unzipping which is wrong.

This change simply does not try to process the body for HEAD requests.

vdobler/ht,vdobler/ht,vdobler/ht,vdobler/ht