
This flushes the internal buffer where output of a VSP page is stored pending the execution of the page@s code.
This sends the content of the page output buffer along with headers and disconnects the client.  The status is 200 OK by default, unless overridden by http_status.
The purpose of this function is to allow a page to send output before terminating, thus the page can continue processing for an indefinite time without requiring the client to wait.  This is useful for starting long running background tasks from HTTP clients.

VSP pages that use this function must be sure to supply appropriate content
(or response headers) if needed before calling this function.
