(from awebb)

Fixes a bug in BaseRequestHandler.

If the length of the patter is equal to, or greater than, the length of
the actual request path, then an exception is thrown. System using is
added to support use of String.Empty. Exception is used to ensure most
efficient operation on (assumed to be most common) successful case.

OpenSim/Framework/Servers/BaseRequestHandler.cs

@@ -25,6 +25,8 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
+
 namespace OpenSim.Framework.Servers
 {
     public class BaseRequestHandler
@@ -56,7 +58,14 @@ namespace OpenSim.Framework.Servers
 
         protected string GetParam(string path)
         {
-            return path.Substring(m_path.Length);
+            try
+            {
+                return path.Substring(m_path.Length);
+            }
+            catch (Exception)
+            {
+                return String.Empty;
+            }
         }
     }
 }