Adjusting request schema value according to connection tls state.

This closes #223 issue on GitHub.

src/java/nginx/unit/Request.java

@@ -980,11 +980,13 @@ public class Request implements HttpServletRequest, DynamicPathRequest
     @Override
     public boolean isSecure()
     {
-        log("isSecure");
+        trace("isSecure");
 
-        return false;
+        return isSecure(req_ptr);
     }
 
+    private static native boolean isSecure(long req_ptr);
+
     @Override
     public void removeAttribute(String name)
     {