Improving the user experience IIS 4.0 makes it easy to customize how content is presented on your site. Custom error messages IIS 4.0 allows you to customize the content that is returned to a browser or run an application to handle the error. Instead of using the default error messages, administrators can choose to send custom error messages to the client. You can define custom ASP pages to handle specific errors. Some Web browsers, such as Microsoft Internet Explorer version 3.0 or later, can detect these content labels and help users identify potentially objectionable Web content.
Users can also choose to use a content rating system provided by another organization.
Content expiration Content managers can use IIS 4.0 to easily set an HTTP header that determines how long a Web page should remain in the client's cache. This is useful for setting a date in time-sensitive material, such as special offers or event announcements. The browser on the client's machine compares the current date to the expiration date to determine whether to display a cached page or request an updated page from the server. Custom headers Using this property, a content manager can send a custom HTTP header from the Web server to a browser. For example, this can be used to send a custom HTTP header to allow the client browser to cache the page but prevent proxy servers from caching the page.