auth_request called multiple times for same single request

[garyc]

Ok, thanks, I will look into tcpdump. In your opinion, in principle, is what
i am attempting feasible?

>In the second case, 30 seconds after the response was sent by nginx, the
>request body still wasn't received and nginx had nothing to do than just
>close the connection.

This suggests to me that although i am attempting to intercept the request
header and reject it if there is insufficient space (auth_request) the whole
request must be received anyway so if the file is large enough such that 30
seconds isn't enough time to receive it all then the connection will be
closed. 
Even if i can increase this timeout I really need to find a solution that
will protect against the entire file being received unless there is space
for it, these files can be up to 10GB in size.

I perhaps need to look again at a 2 stage process to validate the space
available (GET) before attempting the upload (POST).

Many thanks
Gary

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,276512,276558#msg-276558