fastcgi_request_buffering

This directive appeared in version 1.7.11.

Enables or disables buffering of a client request body.

When buffering is enabled, the entire request body is read from the client before sending the request to a FastCGI server.

When buffering is disabled, the request body is sent to the FastCGI server immediately as it is received. In this case, the request cannot be passed to the next server if nginx already started sending the request body.