Replace all instances of InvariantCultureIgnoreCase with OrdinalIgnoreCase in string comparisons.

InvariantCulture is useful when comparing / sorting human language strings in a culturely correct way. It handles things like accented letters in a way that makes sense to humans (e.g., 'a' should be sorted next to 'á', rather than after 'z').
Ordinal looks just at the raw code points of the characters. As such, it is recommended for use in cases when comparing system strings (file paths, command line parameters, config settings, etc.). Since it doesn't need to use the culture specific sorting rules, this method can often be faster.

For more information, see https://stackoverflow.com/questions/492799/difference-between-invariantculture-and-ordinal-string-comparison (and other related questions)

Duplicati/Server/WebServer/RESTMethods/WebModule.cs

@@ -14,14 +14,27 @@
 //  You should have received a copy of the GNU Lesser General Public
 //  License along with this library; if not, write to the Free Software
 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-using System;
+using System;
+using System.Linq;
 
 namespace Duplicati.Server.WebServer.RESTMethods
 {
     public class WebModule : IRESTMethodPOST
     {
         public void POST(string key, RequestInfo info)
-        public void POST(string key, RequestInfo info)
+        {
+            var m = Duplicati.Library.DynamicLoader.WebLoader.Modules.Where(x => x.Key.Equals(key, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
+            if (m == null)
+            {
+                info.ReportClientError(string.Format("No such command {0}", key), System.Net.HttpStatusCode.NotFound);
+                return;
+            }
+
+            info.OutputOK(new { 
+                Status = "OK", 
+                Result = m.Execute(info.Request.Form.Where(x => !x.Name.Equals("command", StringComparison.OrdinalIgnoreCase)
+                ).ToDictionary(x => x.Name, x => x.Value))
+            });            
         }
     }
 }