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never, even explitic requests are ignored. If
on_request, chunked encoding is used if requested through the CGI header and allowed by the client. If
if_possible, chunked encoding is used whenever the client allows for it, which is interpreted as the client supporting HTTP 1.1 or higher.
Chunked encoding is more space efficient and allows the client to start processing partial results. The drawback is that errors lead to incomplete pages instead of a nicely formatted complete page.