[Chicken-janitors] #1579: spiffy does not flush output port

[Chicken Trac]

#1579: spiffy does not flush output port
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 Reporter:  zbigniew    |                 Owner:
     Type:  defect      |                Status:  new
 Priority:  major       |             Milestone:  someday
Component:  extensions  |               Version:  5.0.0
 Keywords:  spiffy      |  Estimated difficulty:  easy
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 Port slot 8 (closed?) changed from a bool to a fixnum in Chicken 5, which
 made the existing port closed test in handle-incoming-request always
 succeed, so output was never flushed.

 This can lead to hangs when output size is less than tcp-buffer-size. This
 behavior was observed in chickadee when output size < 1024, including on
 simple responses like 302 redirects.

 Fix is to use the official accessor instead, which seems to work fine. I'm
 not sure if this was a legacy thing, but other procedures in the spiffy
 code use port-closed?.

 Patch is attached.

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Ticket URL: <https://bugs.call-cc.org/ticket/1579>
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