Automatically Updating a Web Page When a Server-Side File Changes

Figure 16-15 and Figure 16-16 demonstrate how to use HEAD calls, server-side file reading, and the cache-tricking technique to read a file from a webserver, display its contents, and update the contents whenever the file on the server changes. This type of application is useful whenever more than one person can update a file on a webserver—for example, if two people have access to the same To Do list.

Client-side checking for updated server-side file

Figure 16-15. Client-side checking for updated server-side file

Figure 16-15 lists the client-side portion of the application. Clicking the Read the File button in the form at the bottom ...

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