nginxã®ã¹ãã¼ã¿ã¹ã³ã¼ã444 nginxç¬èªã®ã¹ãã¼ã¿ã¹ã³ã¼ã444ã¯ãã¬ã¹ãã³ã¹ããããè¿ããã«ã³ãã¯ã·ã§ã³ãåæã§ãããã¬ã¹ãã³ã¹ããããè¿ããªãã®ã§ãã¹ãã¼ã¿ã¹ã³ã¼ã444ãã¯ã©ã¤ã¢ã³ããåãåããã¨ã¯ãªãã http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#return The non-standard code 444 closes a connection without sending a response header. DoSæ»æãªã©ãç¹å®æ¡ä»¶ã®ã¢ã¯ã»ã¹ãBANããã¨ãã«ããªãã¹ãè¨ç®æ©ãªã½ã¼ã¹æ¶è²»ãæãããã¨ãã«ä½¿ããã¯ãã 403ãè¿ãã¨ããªã©ã¨æ¯ã¹ã¦ãã¬ã¹ãã³ã¹éä¿¡ã®ããã®CPUã³ã¹ããç¯ç´ 403ãè¿ãã¨ããªã©ã¨æ¯ã¹ã¦ãã¬ã¹ãã³ã¹ãããåã®ãããã¯ã¼ã¯å¸¯åãç¯ç´ HTTP Keepalive
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