為什麼 Bingbot 一直用隨機搜尋字詞來灌爆 Wordpress 網站

近幾個月來如果有定時分析網頁記錄的或有時發生 CPU 飆高。你可能正面臨 BingBot 用隨機字串搜尋爬你的網站資料。一般 wordpress 的專家都知道 wordpress 只有在使用靜態頁快取時才會反應較快且吃的 CPU 資源也較低。但如果發生隨機字串搜尋時就會直接吃 PHP + MYSQL 資源，此時就是網站發生反應慢及 CPU 飆高。較慘狀況是網站直接當機或被雲端廠商直接鎖網站。如附圖重覆網址一直搜尋。

解決方式

一般會以 robots.txt 來解備，但這緩不濟急，你得讓 Bingbot 重新讀取後才有可能生效。但問題是現在正面臨該問題。且也不知道新的 robots.txt 何時會生效。這邊我建議的是用 .htaccess 解決。直接擋 User Agent 是 bingbot 且搜尋字串有特定字出現。如附圖

40.77.167.17 - - [26/Dec/2025:15:14:15 +0800] "GET /search?source=keyword HTTP/1.1" 301 4246 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"
40.77.167.1 - - [26/Dec/2025:15:14:20 +0800] "GET /search?source=keyword HTTP/1.1" 301 4246 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"
40.77.167.17 - - [26/Dec/2025:15:14:38 +0800] "GET /search?source=keyword HTTP/1.1" 301 4246 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"
40.77.167.17 - - [26/Dec/2025:15:14:39 +0800] "GET /search?source=keyword HTTP/1.1" 301 4246 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"
40.77.167.17 - - [26/Dec/2025:15:14:40 +0800] "GET /search?source=keyword HTTP/1.1" 301 584 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"
40.77.167.17 - - [26/Dec/2025:15:14:41 +0800] "GET /search?source=keyword HTTP/1.1" 301 584 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36"

在 .htaccess 加上如下程式碼，

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (^|&)source=keyword(&|$) [NC]
RewriteCond %{HTTP_USER_AGENT} bingbot [NC]
RewriteRule ^ /? [R=301,L]
</IfModule>