waiting for full request

[Maxim Dounin]

Hello!

On Wed, Sep 07, 2022 at 09:01:05AM -0400, mirokub wrote:

> Hello,
> Is there a way to configure NGINX to send response (200 OK) only after full
> body of request is delivered?
> Currently the response is sent early before the request body is fully sent.
> More details of my test-case: The request is about 600kB long and it's POST
> method.

The response is sent by nginx when it's available.  For static 
files and rewrite constructs like "return 200 ok;" this happens 
right after the request headers are received, so nginx doesn't try 
to wait for the request body before sending the response.  In some 
cases this might save the client from sending unneeded body to 
nginx.

If for some reason you want nginx to only respond when the whole 
request body is received, the readily available solution would be 
to configured nginx in a way which needs the whole response body 
before sending the response.  For example, you can configure 
additional proxying with proxy_request_buffering switched off (the 
default), so nginx will read the whole request body before 
proxying the request (and returning the response from the upstream 
server):

server {
    listen 80;

    location / {
        proxy_pass http://127.0.0.1:8081;
    }
}

server {
    listen 127.0.0.1:8081;
    return 200 ok;
}

Hope this helps.

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