It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://blog-982835680435.mit-edu.top/post/2406318975/pdf

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "blog-982835680435.mit-edu.top",cType: 'managed',cRay: '90fbe7172c65584e',cH: 'G.Fs_jwm4c8vMlXeCjZ2QxeIP5pUTRi69IhNic8OjHo-1739188447-1.2.1.1-sdloicoYo.dEz4zUgbnaSx9hZm4BArKSpfgh8QIYAYDkZllP9ojKNNNN1P0t5M1u',cUPMDTk: "\/post\/2406318975\/pdf?__cf_chl_tk=bDZe4EAn90UgVK85B9vi6pbLmug9Yqzq3tingATUly0-1739188447-1.0.1.1-EcNNlBohj8ZpHYZirC_Luj7gJYOVJAB0IbtHdmU9TpE",cFPWv: 'g',cITimeS: '1739188447',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/2406318975\/pdf?__cf_chl_f_tk=bDZe4EAn90UgVK85B9vi6pbLmug9Yqzq3tingATUly0-1739188447-1.0.1.1-EcNNlBohj8ZpHYZirC_Luj7gJYOVJAB0IbtHdmU9TpE",md: "FDrnovuPlI0YTxEF3g7ui0L43rFu07.ZaujSEa2tZ_4-1739188447-1.2.1.1-tRNMP493kILlk8t7n0KnfceAmeuzFLrGQXhcFjJNZlSYIz9Sbfeu.H3tqzNdiXW3BUvR1q9HWgUZkmcIalNL5y67Lj6_XA_rmp8pLJxQ8fGSwmqGQ.90aQtlUP6nC0s6pJotaZWlE8RhS63m3YnIPJl.7UKtuA_IHfcwopXU2rBF2ds0_T809Aa1m5voPuKk5xYybJdW9PM_YQRIg.7C61OfUgd9RJsO7l8h3WlrOv4SBz_AdsNr5yRA6p1PRyPvqNrZ_39xjnGLuyI5SPGLz8BD2G6a8zyX3yOUqwuxyk9Z43Uvyr9M7HJRUR3f18yPHKWyBQRwucMLRZZT1r6gB45dA4WHt4_4IuP7QqmMeqLzI6HhDZLq9hZIoebOms9Xa9vJef7fYMlID9_gHV.uuy3IwBzsEj0BArMkFxmz220vkw3WHIgd.NelBAGXAifUZ75JlO7PcL4RFxPbj_Yrek39JZK6ZatXC8Ud9.81ICY.WM2Wmcp9gxKY15GgCMYTd1HZIq_NCvsuvdRycDWtS7OIGnHrzUG2Qykdh6q4X_42lHHX3XGaBzURIdLJ6cWNJE1TUE6ON7fKd3j4.KNQ.TMOUoMuj69NTagWZMrFkotR4o4Ww9WcPqnvNez6S7BTwrX13pTkSNenKI..9K_3dJU8uTfMAJRJippDQu9Es7NfcGF_edMTW9i2t__sDDL.baxYCcZF747K67ngedvVJhM.jvAAjGp53Kj8I_ZKHc46PlBfq0kV1OOb55jgcI4TMaXrXWXPtstiVuOC7g.0avv8q5GauP39Jg7wuuaLp58LyYFk4LsLGr4Z1_AOJQXIqp0q3s21O.xIcz3oLO6pVyn6VQQxTbpzV6Ikvi6SdkFJ__uZ4qSUqf8MG.MwC5GzCrv5z1hPz0H6q8zNn0r_2VLBca_cSIliUraoOLO1UiuEYVp2u444MAGKQTe.5l8EDmgyt.xawogAM0SvikQ0Z0iZAKy7l_kzPxPcz45lTCKqq7Wtr9SvkTQnQaLtEgSFsv7TJpWLV5STZDTVrAqbE13MKbPISXvHeFCmxgkE5vQSNRUqpJGss37v7YiTcq8yskmjDdFfUxMdoMnbR507rkWtAcmT0WDEQdZdJpf5BYND7ohoHPYpElnaIAfnJkyyyAMgaN7oUTrWCkHV2feRaklOL1ncBQHPqIFhouK4ZMRTBywTvfF4ekyBJPBhkUm0p3sPR20iJqoWDP_9Kr16HddEL0WnGAFpXJWkd7QpRDgnpXNZkScA1ndGbmn9S.lZtHcyIoVGkT3zreo1IR3OxOENi2hihS7Wuk9Hsn1EMoLnMne9PSQZn3KheDb8r5q9pleyK0mDR6Jvm71BcYI8pOreuI1ZTHnjPVyFtslnfUbzHmHT1nIXeSGRkBK.hMPjHVYfvHWEmEGpSM408x_157eRx7mbygbnMhemj_lQNl14qg7UK4t4OqW7yugHgSOEUv2N7XSbrJR.tZXzbHJwJJB8WpfaznJiEf3WogavoP_DyxRIlQrdj5myx1jxvI5Qg.LcnNW3YvQMY5YQZnpE7aVLFr2ic3p54_ITSgIAjxGxc1mzDDWcaaIc56tl2VL5mQJwCQq4sXQhyD0kvLQpj8TYqQ_Ha0nQuyVrF7DGHeR60TycULSvxCNR.qUVPs0nbVUAAhvH749NDIvLkuirAOqtXGZqDtsxxh5CVA3L.oNEGUUQb6.h4LUpUBI5NAdbmowICd4dpLTIKvUpUzlUwhp_4A8KNHnz..a36NDpUgJ.7WNKWTxCGP6o_rGyql2IKRsEZD6khlH.boNAv13_NOO5zdXEWZBcY8T9uRBVkzhE82H7IDyvbOqN7guGAP020M3Bm7CTKW9XlOJc7ns0CV1rG7QEQXAwicU.ahUDgIs5kkKwNJSt6xltC6MmCSwPCLqoIdnoEkieLggki98sWZwuONBAZLpvMlluyvhrzq3.P6V_87zoMYHvhn7cFIKNAjTPmqV318yKi7c.A.DoXvAnFiSZY9Emt9hIxPXyEJRImZrzydBeITu4KJo5VJ0RHcVTOU9gT9Yk8co7MKkVLCyPakKXJCZ6gcuLlQ9pxiAi2rJqpaSQHLS_8gMaOSPcldDVqbm320yq2T6grkG4kGs1DIl7gfnQojIC2wAbfCjOqx5TK8Ni_6MXQ6LlUXrydr04yw.bvQKltG4LasfMRNGPeGH5vh7aRPqVTuQPqsm2a7ZZdSsv9sUM4wKDScVv1q56qLmKuMgQ94pm5UWyxg",mdrd: "pSi4D5.n0UAFYClxI1gguxP3OUEOJUgPuK8wvWWKIEg-1739188447-1.2.1.1-GMNHUBKznJVDZ6.6qLdaVSIIueo3EnOukawCsex8iL8SbdU3wRvuihA3eDPw5nxOPr.UNohcGkhfCxGvTOf_ATOjvcvater_2bMiqI3_1TZTrHe_JYDjwwZw6et4ovZJAN1yn4dI02DEKKyjV5zwxMC40Cmqjl_NkbP_wwreHy2H4U_BJeuHASzVff0pOuc58EPjTXg2ckTxxdbu_A79q8UmJWHTvdVsbEEXW6v.zjgaGVHVJl5ZEVFLPH632ICo3n5K2L73oIdek88oj4AFp4nn6O0Evwph3KERCTYezoRgr0tkgqGMVueOBMLwuJ0Ndoh66buS8j0iHtC0hLkxOKQDaUESOTOGhDrw.4KGVh33HV27hU7QkxqvSVYfH5yLgGc9CeKz5W6rsukG.ZQfF0uTqbJUNFZ2nv_IpR4ro_715BeQ2nIhRtLf5bH7vEwfLFUdgEErTTLZSRo8U0X.7G9vGAbR4UwyenX8pCo4AjYDCHywqRdbBR145o5f3fEF0SubjAldyVw0wMOUYAMnDmhAH.yS_JLQOQkBKhGPWuS7K.4X1zjaHH5mGfZCFkTYey91JaN0TaQjz03lQHT9ONszirMpLkl_0RfJXBLzor.4T.GJr4Xnx4fqPdFQNcuOhj1e8NhqRyhTDrTHcQsSJNPWCNE0TqXtnX4yALOjoxiBP4fMBCGRJ8DNC4LOKu6.PtUqfX8vpd8_5ju45235uT1KeXDD4R9g9EMXzgF0ydXPSz7uQ56gYNaPGH0AW9nyEolCquJ3h_6bfdRGOXL2Mb1nka8K5dQfSXa5tCoHFiCGbO0z.gnLlfpvqI_GstEngy9ctTX71fdpZH1lNYLbeB5gnRNrMV4Nu5WsgNSe.BCIXeC5..SIhhvlIV4935_OyYz8FdEApb4EkdbTkrD0StEJwqMZmsUq028vGVQHlydzDiumRC4K3wlUaNb.t3X91Gz_CUi6S4qZLpom6BKuVaMERiNNBxPiiaC5ZJKzPuhKkbQuTReTh4DY_8R_gNi4zwsxtYcsetuRiaQRb96lnL3Mk3r4m6hi1Blhg9oRJANHtsK.u78u8AKL_wrp8TcccVJp.6pdqISgXMn7ljVcaxVJZowZ2kX5PqvfA.e11pjpY34ffuMoEWyBJYlQUe1pOe6xz_dHGWxfKh1zp._ygOy13U8X.EB.FcD_HGyTz1JBUWYxuDV2.zXITXIQoaYgklL2hQ9EurM9NiWX8HdCGkrp5rbqsZ_bsr3uNcWcw28zUxwrl4MQD5hqdhBIJXrR8uq7lqauFC_qWjUJSEEBs9eQjNHXP5hPywvpF.Ou_OR3f8O1lGNdqMbCCHlJ78Zr.27dGt10rXtHEg6YM0deSI4Xy0pELvF.WWXqBoEQSojDOWVMna93l6QHpQuPYpWcICSnjtmAvL.3LHxK1GV2femxlDzjm0KCQiWS4_XKzzc.euiHyaiZiCvpmVuFq.GxBHlsheAi3gykQBKPMz6ckxSoAgOCqIqyIfeH8QNNJEyAuji_wF9w3Njy5CKLe7BcUAiaDikPH6hh4mYlJDFnA1ooBREJdYrODXMGY6x7kP1oQ5GghQmA07mdGWhWzRYPjiNEclXPEp6STOo_pzq4Bt.b9iaeN4.rGpMZbWIQ1toGkWL_EBm5VuqxS41ixymODAp13Iu6rEytmy_SN7Gka4PIa5XP9cAKLeEbF2XLMQFDiCf_sP3JcNXfHiYlJSGIERXHAbTXyKDl..7SMART_ZZD6hN3dXrFBRGmFxBCV1IOMvgdf2Zge55kj2Axc8CdfeS7IBJIYLv6dlHHlFseAhUpafSLTIACCpRxgtpe0SA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fbe7172c65584e';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/post\/2406318975\/pdf?__cf_chl_rt_tk=bDZe4EAn90UgVK85B9vi6pbLmug9Yqzq3tingATUly0-1739188447-1.0.1.1-EcNNlBohj8ZpHYZirC_Luj7gJYOVJAB0IbtHdmU9TpE" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda