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                **if判斷指令** 語法為`if(condition){...}`,對給定的條件condition進行判斷。如果為真,大括號內的rewrite指令將被執行,if條件(conditon)可以是如下任何內容: * 當表達式只是一個變量時,如果值為空或任何以0開頭的字符串都會當做false * 直接比較變量和內容時,使用`=`或`!=` * `~`正則表達式匹配,`~*`不區分大小寫的匹配,`!~`區分大小寫的不匹配 `-f`和`!-f`用來判斷是否存在文件 `-d`和`!-d`用來判斷是否存在目錄 `-e`和`!-e`用來判斷是否存在文件或目錄 `-x`和`!-x`用來判斷文件是否可執行 例如: ~~~ if ($http_user_agent ~ MSIE) { rewrite ^(.*)$ /msie/$1 break; } //如果UA包含"MSIE",rewrite請求到/msid/目錄下 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { set $id $1; } //如果cookie匹配正則,設置變量$id等于正則引用部分 if ($request_method = POST) { return 405; } //如果提交方法為POST,則返回狀態405(Method not allowed)。return不能返回301,302 if ($slow) { limit_rate 10k; } //限速,$slow可以通過 set 指令設置 if (!-f $request_filename){ break; proxy_pass http://127.0.0.1; } //如果請求的文件名不存在,則反向代理到localhost 。這里的break也是停止rewrite檢查 if ($args ~ post=140){ rewrite ^ http://example.com/ permanent; } //如果query string中包含"post=140",永久重定向到example.com location ~* \.(gif|jpg|png|swf|flv)$ { valid_referers none blocked www.jefflei.com www.leizhenfang.com; if ($invalid_referer) { return 404; } //防盜鏈 } ~~~
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