Fastolfe has some good comments, but I want to expand a bit. There are additional reasons it might be necessary to turn off buffering:

First, if you have a potentially slow connection, and it could take longer than your timeout to generate enough information to fill the buffer.

Second, if the information you send has a positional aspect (as in, the HTTP headers must precede the content). If the potential exists that an error message may go out before the full headers, you may disable buffering.

The disclaimer, of course, is that I'm not an expert here. :)

In reply to Re: When to use Autoflush by chromatic
in thread When to use Autoflush by chorg

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