- fix outrun of buffer when Host: header contained :port in ipv4 requests
src/main/http_vhost.c@fix_hostname(), bug introduced in r1.6 (4 years, 9 months ago)
thx patrys for helping debugging this.
as a result time to time 400 responses were given with "Client sent malformed
Host header" in error log, depending what was in memory left from previous
request.