Hello!

On Thu, Sep 01, 2011 at 03:30:34AM -0400, bigplum wrote:

> Hi,
>
> I write a module for file download, but sometimes it will alert
> "the http output chain is empty while sending to client".
> And I check the code, it seems that if proxy busy buffer run out,
> write_filter will always return ngx error.
>
> Is that right?

If ngx_http_write_filter() is called with NULL, r->out must not be
empty. If it's empty - this means that buffer(s) to flush
disappeared somewhere, and alert will warn you about this problem.

Maxim Dounin

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