How would it be possible in nginx to evaluate if the
Content-Encoding: gzip request header is set (coming from a web client to nginx), and then let nginx
gunzip the request before it gets forwarded to an upstream (e.g. fastcgi)?
After more research it seems decompressing requests is not possible out of the box. Using LUA like described here is unfortunately not something I want to do: http://www.pataliebre.net/howto-make-nginx-decompress-a-gzipped-request.html#.VrCv87IrKHt.
Seems like I'd have to handle the decompression in my backend server code :/