Hey.

I am running my PHP app through a NodeJS server using a FastCGI bridge. Today, 
I was about to implement an image uploader on my site - only to realize that 
file uploads were not possible.

So I generated a few files and tested how big the files must be for the upload 
to fail. I got surprised how early this happened:

Ingwie@Ingwies-Macbook-Pro.local ~/W/BIRD3 $ genfile 31k text.txt; and curl -v 
-4 -X POST -F "img=@text.txt" http://localhost:8080/user/changeAvatar
(…)
Ingwie@Ingwies-Macbook-Pro.local ~/W/BIRD3 $ ls -l text.txt 
-rw-r--r--+ 1 Ingwie  staff  63488 29 Mär 23:10 text.txt

the genfile command is a simple function:

function genfile
    command dd if=/dev/urandom of=$argv[2] bs=$argv[1] count=2
end

(I am using the fish shell, so its slightly different to Bash.)

The error that I am seeing on the PHP end is that the file array’s error 
property shows „3“, which is the UPLOAD_ERR_PARTIAL constant.

My question is, under which conditions is that error triggered? I can verify 
that my NodeJS FCGI bridge is correctly giving all bites to the process, so PHP 
should actually have the entire request body (the file names and contents) at 
hand.

BTW, my backend is talking to PHP via php-fpm.

Kind regards, Ingwie.
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