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* Add Content-Length header to HEAD requests This change adds the header Content-Length to HEAD HTTP requests. The previous behaviour was blocking some Windows executables (i.e bitsadmin.exe) from downloading files hosted in Gitea. This along with PR #14541, makes the web server compliant with HTTP RFC 2616 which states "The methods GET and HEAD MUST be supported by all general-purpose servers" and "The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response." This should also respond to issues #8030 and #14532. * This change adds the header Content-Length to HEAD HTTP requests Pass the Size of the content as a parameter to ServeData() instead of calculating it using ioutil.ReadAll(reader) --> this call is dangerous and can result in a denial of service. * Add Content-Length header to HEAD requests Quick fix for imported dependency not used. * Check if size is positiv int ... Co-authored-by: zeripath <art27@cantab.net>