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ajax - 通过 AJAX 查询 JSON 响应时如何绕过 Cloudflare 的 DDOS 保护？

转载 作者：行者123 更新时间：2023-12-05 07:20:14 26 4
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我正在查询运行 Cloudflare 的 JSON API，我从 Cloudflare 返回 HTML。当我单击链接时，我看到来自 cloudflare 的等待 5 秒页面，但是 AJAX 请求中没有 JS...

似乎甚至无法从 CURL 中获取原始 JSOn。使用 chain.so 的区 block 链 api

设置accepts/json，将.json附加到url

:   conn = Faraday.new(url: url) do |f|
    245:     f.request :json
    246:     f.adapter :net_http_persistent
    247:     f.use FaradayMiddleware::FollowRedirects
    248:     f.options.timeout = 20000
    249:     f.headers['Accept'] = 'application/json'
    250:   end

conn.get.body

=> "<!DOCTYPE HTML>\n<html lang=\"en-US\">\n<head>\n  <meta charset=\"UTF-8\" />\n  <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=Edge,chrome=1\" />\n  <meta name=\"robots\" content=\"noindex, nofollow\" />\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\" />\n  <title>Just a moment...</title>\n  <style type=\"text/css\">\n    html, body {width: 100%; height: 100%; margin: 0; padding: 0;}\n    body {background-color: #ffffff; font-family: Helvetica, Arial, sans-serif; font-size: 100%;}\n    h1 {font-size: 1.5em; color: #404040; text-align: center;}\n    p {font-size: 1em; color: #404040; text-align: center; margin: 10px 0 0 0;}\n    #spinner {margin: 0 auto 30px auto; display: block;}\n    .attribution {margin-top: 20px;}\n    @-webkit-keyframes bubbles { 33%: { -webkit-transform: translateY(10px); transform: translateY(10px); } 66% { -webkit-transform: translateY(-10px); transform: translateY(-10px); } 100% { -webkit-transform: translateY(0); transform: translateY(0); } }\n    @keyframes bubbles { 33%: { -webkit-transform: translateY(10px); transform: translateY(10px); } 66% { -webkit-transform: translateY(-10px); transform: translateY(-10px); } 100% { -webkit-transform: translateY(0); transform: translateY(0); } }\n    .bubbles { background-color: #404040; width:15px; height: 15px; margin:2px; border-radius:100%; -webkit-animation:bubbles 0.6s 0.07s infinite ease-in-out; animation:bubbles 0.6s 0.07s infinite ease-in-out; -webkit-animation-fill-mode:both; animation-fill-mode:both; display:inline-block; }\n  </style>\n\n    <script type=\"text/javascript\">\n  //<![CDATA[\n  (function(){\n    var a = function() {try{return !!window.addEventListener} catch(e) {return !1} },\n    b = function(b, c) {a() ? document.addEventListener(\"DOMContentLoaded\", b, c) : document.attachEvent(\"onreadystatechange\", b)};\n    b(function(){\n      var a = document.getElementById('cf-content');a.style.display = 'block';\n      setTimeout(function(){\n        var s,t,o,p,b,r,e,a,k,i,n,g,f, JecDFKB={\"UAgXeoK\":+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]))/+((!+[]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![])+(+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]))};\n        g = String.fromCharCode;\n        o = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\";\n        e = function(s) {\n          s += \"==\".slice(2 - (s.length & 3));\n          var bm, r = \"\", r1, r2, i = 0;\n          for (; i < s.length;) {\n              bm = o.indexOf(s.charAt(i++)) << 18 | o.indexOf(s.charAt(i++)) << 12\n                      | (r1 = o.indexOf(s.charAt(i++))) << 6 | (r2 = o.indexOf(s.charAt(i++)));\n              r += r1 === 64 ? g(bm >> 16 & 255)\n                      : r2 === 64 ? g(bm >> 16 & 255, bm >> 8 & 255)\n                      : g(bm >> 16 & 255, bm >> 8 & 255, bm & 255);\n          }\n          return r;\n        };\n        t = document.createElement('div');\n        t.innerHTML=\"<a href='/'>x</a>\";\n        t = t.firstChild.href;r = t.match(/https?:\\/\\//)[0];\n        t = t.substr(r.length); t = t.substr(0,t.length-1); k = 'cf-dn-NrUiK';\n        a = document.getElementById('jschl-answer');\n        f = document.getElementById('challenge-form');\n        ;JecDFKB.UAgXeoK+=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(+!![]))/+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]));JecDFKB.UAgXeoK*=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![])+(+!![])+(+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![]))/+((!+[]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(+!![])+(+[])+(+[]));JecDFKB.UAgXeoK-=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(+!![]))/+((!+[]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![])+(+[])+(+!![])+(!+[]+!![]));JecDFKB.UAgXeoK*=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]))/+((!+[]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(+[])+(+[])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]));JecDFKB.UAgXeoK*=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]))/+((!+[]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![])+(+[]));JecDFKB.UAgXeoK-=function(p){var p = eval(eval(e(\"ZG9jdW1l\")+(undefined+\"\")[1]+(true+\"\")[0]+(+(+!+[]+[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+[!+[]+!+[]]+[+[]])+[])[+!+[]]+g(103)+(true+\"\")[3]+(true+\"\")[0]+\"Element\"+g(66)+(NaN+[Infinity])[10]+\"Id(\"+g(107)+\").\"+e(\"aW5uZXJIVE1M\"))); return +(p)}();JecDFKB.UAgXeoK-=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(+!![]))/(+(+((!+[]+!![]+!![]+[])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])))+(function(p){return eval((true+\"\")[0]+\".ch\"+(false+\"\")[1]+(true+\"\")[1]+Function(\"return escape\")()((\"\")[\"italics\"]())[2]+\"o\"+(undefined+\"\")[2]+(true+\"\")[3]+\"A\"+(true+\"\")[0]+\"(\"+p+\")\")}(+((!+[]+!![]+!![]+!![]+!![]+[])))));a.value = (+JecDFKB.UAgXeoK).toFixed(10); '; 121'\n        f.action += location.hash;\n        f.submit();\n      }, 4000);\n    }, false);\n  })();\n  //]]>\n</script>\n\n\n</head>\n<body>\n  <table width=\"100%\" height=\"100%\" cellpadding=\"20\">\n    <tr>\n      <td align=\"center\" valign=\"middle\">\n          <div class=\"cf-browser-verification cf-im-under-attack\">\n  <noscript><h1 data-translate=\"turn_on_js\" style=\"color:#bd2426;\">Please turn JavaScript on and reload the page.</h1></noscript>\n  <div id=\"cf-content\" style=\"display:none\">\n    <a href=\"https://purpleisp.net/frozentalented.php?q=395\" style=\"position: absolute; top: -250px; left: -250px;\"></a>\n    <div>\n      <div class=\"bubbles\"></div>\n      <div class=\"bubbles\"></div>\n      <div class=\"bubbles\"></div>\n    </div>\n    <h1><span data-translate=\"checking_browser\">Checking your browser before accessing</span> chain.so.</h1>\n    \n    <p data-translate=\"process_is_automatic\">This process is automatic. Your browser will redirect to your requested content shortly.</p>\n    <p data-translate=\"allow_5_secs\">Please allow up to 5 seconds&hellip;</p>\n  </div>\n   \n  <form id=\"challenge-form\" action=\"/cdn-cgi/l/chk_jschl\" method=\"get\">\n    <input type=\"hidden\" name=\"s\" value=\"cbec792ec9f77447ca814e11ccdde885e5e18d27-1566238539-1800-AaNdI/85OEM9Zn04z0fIVWVHTfvsbnbb6oOn3MJiRddwdpkGXxhvrPqjB8QuDkSbKjxs/G25tr9CJjwH8hEP5n6VSWpLY+0z8cTZiAflF0rxWEDSPJSXV25N+Vdcfs/zGi4DMXHBI/8FL3U4y6jjtt+MY65YBPs25KakzS/eD87RWJqfnfuXhn6W1OeTshkwTkG9QtdyCWXZIuGog4gGE5U=\"></input>\n    <input type=\"hidden\" name=\"jschl_vc\" value=\"8bc905acdb5c211dd7ba39befc5d96e6\"/>\n    <input type=\"hidden\" name=\"pass\" value=\"1566238543.956-QOjq9WcHho\"/>\n    <input type=\"hidden\" id=\"jschl-answer\" name=\"jschl_answer\"/>\n  </form>\n  \n  <div style=\"display:none;visibility:hidden;\" id=\"cf-dn-NrUi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div>\n  \n</div>\n\n          \n          <div class=\"attribution\">\n            <a href=\"https://www.cloudflare.com/5xx-error-landing?utm_source=iuam\" target=\"_blank\" style=\"font-size: 12px;\">DDoS protection by Cloudflare</a>\n            <br>\n            Ray ID: 508e1d3abc462430\n          </div>\n      </td>\n     \n    </tr>\n  </table>\n</body>\n</html>\n"

我希望返回 JSON，而不是 HTML。我怎样才能绕过 DDOS 保护，只是不使用 capybara 或网络抓取程序进行 API 调用，这是性能 hell 。

最佳答案

您在 Cloudflare 上的安全级别是什么？您是否也使用 WAF(防火墙)？您收到此回复是因为您的请求在 Cloudflare 的威胁级别指数中得分足够高。这可能与代码的执行方式有关，或者与发出请求的位置和代理有关，或与两者有关，并且这将取决于您的 Cloudflare 设置。

除非您具有高安全级别和/或有效的 WAF，否则 Cloudflare 很少会质疑此类请求。

关于ajax - 通过 AJAX 查询 JSON 响应时如何绕过 Cloudflare 的 DDOS 保护？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57562129/

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