- Use of $document_root and $realpath_root in "alias" is prohibited. - "client_max_body_size 0" disables request body size checking. - Default is "large_client_header_buffers 8k", on all architectures. - "limit_except" acceptable methods are listed. - Default is "limit_rate 0", which disables rate limiting. - Default is "limit_rate_after 0". - Default is "optimize_server_names off". - Default is "server_name_in_redirect off". - Other non-essential changes.