Redmine.pm: HEAD is not considered as a read-only method (#11749).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10279 e93f8b46-1217-0410-a6f0-8f06a7374b81

extra/svn/Redmine.pm

@@ -295,7 +295,7 @@ sub set_val {
 Apache2::Module::add(__PACKAGE__, \@directives);
 
 
-my %read_only_methods = map { $_ => 1 } qw/GET PROPFIND REPORT OPTIONS/;
+my %read_only_methods = map { $_ => 1 } qw/GET HEAD PROPFIND REPORT OPTIONS/;
 
 sub request_is_read_only {
   my ($r) = @_;