You can use the $host variable
See: http://nginx.org/en/docs/http/ngx_http_core_module.html#var_... And: http://stackoverflow.com/a/15414811
Always be careful with user input though.
See: http://nginx.org/en/docs/http/ngx_http_core_module.html#var_... And: http://stackoverflow.com/a/15414811
Always be careful with user input though.
Of course rigorous testing before going live, but it gives options. I love options :)