Server Error in ‘/Forms’ Application.
A potentially dangerous Request.Form value was detected from the client (Comment=”…10:27 PM, <CustomerService@amc…").
Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (Comment=”…10:27 PM, <CustomerService@amc…").
The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:
1. Add a "Debug=true" directive at the top of the file that generated the error. Example:
2) Add the following section to the configuration file of your application:
Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.
Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.
[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (Comment="...10:27 PM, <CustomerService@amc...").]
System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +9664445
System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection) +184
System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +95
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +58
ASP.amcstubs_irpt_update_amcstubs_aspx.ProcessRequest(HttpContext context) +37
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69
Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18056
Sessions. Unless you use ‘sticky’ load balancing, you will have to have some way of sharing session state between servers. This probably means storing session data on either shared storage, or in a DB.
File uploads and replication. If you allow users to upload files, or you have a CMS that allows you to upload images/documents, it needs to cater for the fact that these files will also need to find their way onto other nodes in your cluster. However, if you’ve gone down the shared storage route mentioned above, this should cover it.
DB scalability. If you’re using traditional DB servers, you might want to think about how you’ll implement scalability at that level. This may mean coding your app so you use one connection string for reads, and another for writes. Then, you are free to implement replication with one master node handling the inserts/updates cascading the changes to read only nodes that handle the bulk of the work.
Middleware. You might even want to go down the route of implementing some kind of message oriented middleware solution to completely hand off business logic functions – this will give you a great level of flexibility in how you wish to scale this business logic layer in the future. Although initially this will be a lot of complication and work for not a great deal of payoff.
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