proxy module handling early responses

[Frank Liu]

Hi,

When using nginx as a reverse proxy, in case of a large POST payload, what
does nginx do when upstream server sends response before nginx finishes
posting the full payload?

One use case is upstream enforces some payload limit and sends a HTTP/413
response when the payload read reaches certain limit. Will nginx catch this
error, stop sending further, and return the 413 to client?

I see a stackoverflow discussion
<https://stackoverflow.com/questions/14250991/is-it-acceptable-for-a-server-to-send-a-http-response-before-the-entire-request>
for a different use case, not sure how nginx behaves.

Regards,
Frank
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