head(path, initheader = nil)
  
	Instance Public methods
	Gets only the header from path on the connected-to host.
header is a Hash like {
'Accept' => '/', ⦠}.
This method returns a Net::HTTPResponse object.
This method never raises an exception.
response = nil
Net::HTTP.start('some.www.server', 80) {|http|
  response = http.head('/index.html')
}
p response['content-type']
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