To include these script files in a client application, do one of the following:
Include these client-side libraries on the web page automatically by adding the "resources" section to the application's Web.config file, as shown below.
For a list of web browsers supported by the Document Viewer, refer to the following document: Supported Browsers.
For the Document Viewer to work correctly, the ASPxHttpHandlerModule (DXXRDV.axd) should be registered in the web.config file as a module for resource processing and as a handler for data processing.
The ASPxHttpHandlerModule is automatically registered in this file in the following cases:
When you create an application with reporting controls using DevExpress project templates;
When you have the Document Viewer in markup and switch to the Design tab in Visual Studio.
You can also register ASPxHttpHandlerModule manually, for example, when you create the Document Viewer programmatically. Insert the module registration in the system.web/httpModules and system.webServer/modules configuration sections, and add the handler registration to the system.web/httpHandlers and system.webServer/handlers sections.
When rendering, the Document Viewer checks the resulting configuration for the corresponding handler's presence. If this handler is not registered, the following error appears:
"The DXXRDV.axd handler is not registered in the web.config (section: system.webServer/handlers). To disable web.config validation, use the DevExpress.XtraReports.Web.ASPxWebDocumentViewer.DisableHttpHandlerValidation property."
In specific cases, you may not need to use handlers and/or validate their registration:
When you do not use the standard handlers and process requests in your custom HTTP handlers;
When handlers are registered inside the <location> section, and it is impossible to perform automatic validation.