[介紹] 如何在 nginx 下設置 User Agent 防砍站

## Add here all HTTP method allowed
	map $request_method $bad_method {
		default 1;
		~(?i)(GET|HEAD|POST) 0;
	}

## Add here all user agents that are to be blocked.
	map $http_user_agent $bad_bot {
		default 0;
		~(?i)(httrack|WinHTTrack|htmlparser|libwww|Python|perl|urllib|Zeus|scan|Curl|email|PycURL|Pyth|PyQ|WebCollector|WebCopier|WebCopy|webcraw|LWP:
:simple|Havij) 1;
	}

## Add here all referrers that are to blocked.
	map $http_referer $bad_referer {
		default 0;
		~(?i)(babes|click|forsale|jewelry|nudit|organic|poker|porn|amnesty|poweroversoftware|webcam|zippo|casino|replica) 1;
	}

## Request-range protection fix.
        if ($http_range ~ "(?:d*s*-s*d*s*,s*){5,}") {
                return 416;
        }

## Deny access based on HTTP method
	if ($bad_method = 1) { return 444; }

## Deny access based on the User-Agent header
	if ($bad_bot = 1) { return 403; }

## Deny access based on the Referer header
	if ($bad_referer = 1) { return 403; }