Hello!

On Mon, May 06, 2019 at 09:30:33PM +0000, Yuhao Zhang wrote:

> Hi, Thank you for the explanation. I definitely need to learn
> more about the protocol spec. Would you help me understand why
> the "proxy_buffer_size" affects the result even when
> "proxy_buffering" is off?

This is because proxy buffer size limits the amount of data nginx
can read from the backend in one read() operation, and hence
limits maximum amount of data nginx will combine into a single
chunk.

> Also, in my network topology, there are no other layer 7 hops.
> nginx is the only thing talks HTTP, and it is directly
> connecting to the backend server. I have also verified that, if
> I bypass nginx and directly connect to the TCP port, everything
> works just fine. So the chunks are not combined before they
> reach nginx.

This doesn't really matter. HTTP does not provide any guarantees
about transfer encoding, and you should not assume chunk
boundaries will be preserved. They won't be.

--
Maxim Dounin
http://mdounin.ru/
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