This image shows the browser output from the response filter example. First, there is filter output from before execution of the HTML page: a horizontal rule, the line "`PRE`", and another horizontal rule. Then there are several lines of text output by the HTML page, starting with "`This is a test page.`". Finally, there is filter output from after the execution of the HTML page: a horizontal rule, the line "`POST`", and another horizontal rule.

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