Fix HEAD response in file_service

CHANGELOG.md

@@ -4,6 +4,7 @@ Version 70:
 * Add basic_parser header and body limits
 * Add parser::on_header to set a callback
 * Fix BEAST_FALLTHROUGH
+* Fix HEAD response in file_service
 
 API Changes:
 

example/server-framework/file_service.hpp

@@ -157,7 +157,7 @@ public:
             boost::filesystem::path full_path = root_ / rel_path;
 
             // Make sure the file is there
-            if(! boost::filesystem::exists(full_path))
+            if(boost::filesystem::exists(full_path))
             {
                 // Send a HEAD response
                 send(head(req, full_path));