{"id":25829,"date":"2023-08-29T06:20:54","date_gmt":"2023-08-29T06:20:54","guid":{"rendered":"https:\/\/nsfocusglobal.com\/?p=25829"},"modified":"2026-04-17T18:07:40","modified_gmt":"2026-04-17T18:07:40","slug":"introduction-to-adss-http-keyword-checking-policy","status":"publish","type":"post","link":"https:\/\/nsfocusglobal.com\/pt-br\/introduction-to-adss-http-keyword-checking-policy\/","title":{"rendered":"Introduction to ADS&#8217;s HTTP Keyword Checking Policy"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><p>HTTP Keyword Checking is a process by which ADS controls HTTP traffic through the ADS device. In addition, ADS takes a specific action (Accept, Drop, Disconnect, Add to blacklist, Add to whitelist, or Limit rate) as configured on passing packets whose source IP address and specific fields match the HTTP Keyword Checking rule. HTTP Keyword Checking blocks traffic from illegitimate users but does not indiscriminately block all packets from a source IP address. This reduces the possibility of blocking legitimate IP addresses.<\/p>\n\n\n\n<p>You can configure up to 32 HTTP Keyword Checking rules, which can take effect only after being referenced in a group protection policy or default protection policy. When a packet reaches ADS, the system matches the packet against HTTP Keyword Checking rules in sequence. Once the packet hits a rule, the system takes the action specified in the rule and stops matching the packet against other rules.<\/p>\n\n\n\n<p>An HTTP Keyword Checking rule can be added, edited, and deleted. This post describes only how to add such a rule, as methods for editing and deleting HTTP Keyword Checking rules are similar to the steps below.<\/p>\n\n\n\n<p><strong>1. Define HTTP keywords<\/strong><\/p>\n\n\n\n<p>Configuration procedure: Choose <strong>Policy &gt; Access Control &gt; HTTP Keyword Checking<\/strong> and click <strong>Add<\/strong>.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"343\" src=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-1024x343.jpg\" alt=\"Red circular no entry sign with a white horizontal bar.\" class=\"wp-image-25830\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-1024x343.jpg 1024w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-300x100.jpg 300w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-768x257.jpg 768w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-1536x514.jpg 1536w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-600x201.jpg 600w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords-200x67.jpg 200w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Define-HTTP-keywords.jpg 1860w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>For <strong>Keyword<\/strong>, you can select multiple check boxes. In this case, the logical relationship is &#8220;and&#8221;, indicating that the rule is deemed to be hit only when all specified keywords are hit at the same time. The action is usually <strong>Drop<\/strong> or <strong>Drop and add to blacklist<\/strong>. For the latter, you need to choose <strong>Policy &gt; Access Control &gt; Blacklist<\/strong> and enable the blacklist function.<\/p>\n\n\n\n<p>Currently, ADS can check keywords by <strong>Method<\/strong>, <strong>Cookie<\/strong>, <strong>Host<\/strong>, <strong>Referer<\/strong>, <strong>Request Url<\/strong>, <strong>Version<\/strong>, <strong>User Agent<\/strong>, and <strong>x-forwarded-for<\/strong>.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking.jpg\"><img decoding=\"async\" width=\"1024\" height=\"424\" src=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-1024x424.jpg\" alt=\"Red circular no entry sign with a white horizontal bar.\" class=\"wp-image-25832\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-1024x424.jpg 1024w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-300x124.jpg 300w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-768x318.jpg 768w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-1536x637.jpg 1536w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-600x249.jpg 600w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking-200x83.jpg 200w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/HTTP-Keyword-Checking.jpg 1860w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Let&#8217;s look at several examples:<\/p>\n\n\n\n<p>Example 1: <strong>Cookie<\/strong> is set to <strong>songshaowei<\/strong>. If the actual cookie is <strong>songshaoweicookietets<\/strong>, the keyword is deemed to be hit.<\/p>\n\n\n\n<p>Example 2: <strong>Referer<\/strong> is set to <strong>http:\/\/www.nsfocusglobal.com<\/strong>. If the actual referer is <strong>http:\/\/www.nsfocusglobal.com<\/strong>, the keyword is deemed to be hit.<\/p>\n\n\n\n<p>Example 3: <strong>Referer<\/strong> is set to <strong>nsfocus<\/strong>. If the actual referer is <strong>http:\/\/www.nsfocusglobal.com<\/strong>, the keyword is deemed to be hit.<\/p>\n\n\n\n<p>Example 4: <strong>Referer<\/strong> is set to <strong>http:\/\/www.nsfocus.com<\/strong>. If the actual referer is <strong>http:\/\/www.nsfocus.com\/nsfocus<\/strong>, the keyword is deemed to be hit.<\/p>\n\n\n\n<p><strong>2.  Configure HTTP Keyword Checking Policy<\/strong><\/p>\n\n\n\n<p>When selecting the HTTP Keyword Checking policy for a protection group, you should select <strong>Yes<\/strong> for enable and add the previously defined HTTP keyword and HTTP Keyword Checking rule. You can select multiple rules, and the logical relationship between them is &#8220;or&#8221;. ADS checks packets against these rules in sequence. If one rule is hit, ADS takes the action specified in that rule. The HTTP Keyword Checking policy, which is as good as ACL, triggers protection as long as it is matched, regardless of whether any threshold (pps) is reached.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies.jpg\"><img decoding=\"async\" width=\"1024\" height=\"411\" src=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-1024x411.jpg\" alt=\"Red circular no entry sign with a white horizontal bar.\" class=\"wp-image-25834\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-1024x411.jpg 1024w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-300x120.jpg 300w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-768x308.jpg 768w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-600x241.jpg 600w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies-200x80.jpg 200w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2023\/08\/Configure-HTTP-Keyword-Checking-Policies.jpg 1271w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>You can view details under <strong>Logs &gt; Attack Details<\/strong>.<\/p>\n\n\n\n<p>Note: ADS only randomly logs at most three alerts on traffic being dropped in every 30 seconds. Therefore, it is possible that ADS drops packets, which, however, cannot be found in attack details.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p>HTTP Keyword Checking is a process by which ADS controls HTTP traffic through the ADS device. In addition, ADS takes a specific action (Accept, Drop, Disconnect, Add to blacklist, Add to whitelist, or Limit rate) as configured on passing packets whose source IP address and specific fields match the HTTP Keyword Checking rule. HTTP Keyword [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":35689,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[23],"tags":[372],"class_list":["post-25829","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ads","tag-ddos-attack"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Introduction to ADS&#039;s HTTP Keyword Checking Policy - NSFOCUS<\/title>\n<meta name=\"description\" content=\"HTTP Keyword Checking is a process by which ADS controls HTTP traffic through the ADS device. 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