Sterling Quinn of the Server team contributed this post on configuring your web server to display custom tiles in areas where you have not yet completed your map cache.<\/p>\n
At the ESRI Developer Summit, several of you asked how we displayed a \u201cData not available\u201d tile in empty areas of the ArcGIS Online services. This kind of tile can be useful if someone pans to the edge of the map or navigates to an area that you have not completed caching. Configuring your server to return a \u201cData not available\u201d tile can in some cases yield a better user experience than returning nothing.<\/p>\n
To display the tile, you need to create a custom error response on your virtual cache directory for HTTP Error 404: \u201cNot Found\u201d. Instead of an error message, the Web server returns the tile.<\/p>\n
Following are steps for this process in IIS. Before you perform these steps, you should put the blank or \u201cData not available\u201d tile in your cache directory. The tile you use must have the same dimensions and image format as the other tiles in the cache.<\/p>\n
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