Adding "proxy_max_temp_file_size 0;" Following the request of a member of the mailing list
@@ -43,6 +43,7 @@ server {
client_body_temp_path /var/spool/piratebox/;
fastcgi_pass_request_body off;
client_body_in_file_only clean;
+ proxy_max_temp_file_size 0;
fastcgi_param REQUEST_BODY_FILE $request_body_file;
fastcgi_read_timeout 600;