>> Zinc can nicely play out the keep-alive. Kom doesn't support
>> keep-alive. With Swazoo a lot of requests fail if keep-alive is
>> enabled (so I disabled it). Details in the attachment.
>
> what is keep-alive?

The server keeps the socket open after a request-response cycle and
allows clients (browsers) to reuse the same socket for multiple
requests. This is typically faster than to open a new socket for each
request.