on 0.7.64 we're seeing a number of "client closed prematurely
connection" errors when very large POSTs (multiple megabytes) are being
done (file uploads).

We've isolated it to ngx_http_do_read_client_request_body, and have
added output of the size of the 'body rest' -- the body rest has a quite
large amount of data, we suspect the contents of the post.

Under what circumstances would we receive no bytes back from the recv,
but rb->rest be very large?

This doesn't occur all of the time, nor with any particular size of POST
body.



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