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This example implements a minimal web server which makes it possible to access the web server's filesystem from a browser and calculate the sum of numbers entered by the user. In the filesystem browser, directories are presented as a numbered list of files. Regular files ending in ".htm" and ".html" are send back to the browser as-is, otherwise HTML is dynamically generated to display the file's content verbatim. The calculator is an example of web-continuations. The web server interacts with the user to obtain a set of numbers to add. At each step the sum of the numbers entered up to now is displayed. Within each HTML page generated is a form to enter the next number. This form has a hidden field which contains a serialized continuation indicating the continuation within the web server where the number entered must be returned. When a thread is created by the web server to reply to the form submitted, that thread will invoke the continuation to return to the point where the (now dead) thread generated the form to obtain the next number. After starting the server with gsi base64 html http web-server 8000 with your favorite browser visit the URL http://localhost:8000/