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://mit-edu-4359286701-gov.caltech-edu.pp.ua/post/4178360529

  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: "mit-edu-4359286701-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '910111d8bfad6fef',cH: 'WtFIy6HSi6IIrmVT40UVqh6QWe2d8BOkgX3OVzli6OA-1739242627-1.2.1.1-g7UcYctdY5UIkrZvLwSMtOCnyWjyCAIOt4mr1.k1EXQKaEOD7epE.vWSDovdgoXa',cUPMDTk: "\/post\/4178360529?__cf_chl_tk=ab.rhmvuLrBLaw5VOMurVZWxBvrRQFH3wRDUwoZQvxs-1739242627-1.0.1.1-Tj5LTbNdihI7P7tAfJDOsw5ACduSo5pNJ9Ek4AsXTWo",cFPWv: 'g',cITimeS: '1739242627',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4178360529?__cf_chl_f_tk=ab.rhmvuLrBLaw5VOMurVZWxBvrRQFH3wRDUwoZQvxs-1739242627-1.0.1.1-Tj5LTbNdihI7P7tAfJDOsw5ACduSo5pNJ9Ek4AsXTWo",md: "MufS48x9VjzXYWcV2r2PsyCCJOzwEb8bQMNyXQqCQ2U-1739242627-1.2.1.1-twAIabNbbsvJJIx2_dkcIuLb2fUiNNNOkNs8z8noLTIeWAUWbs6RunuPqx4wL88IitZYX2YUxODXBdIzRv3NbwBGMzaQcU7upOL7l7ZM4mqqEL6yG2ERjuqmRNwgHlBIeOgWTN0gB_KCrZ1D5reAjoAqlcHqk1FGGHEcsjUCBE1_DsNxubVDAZBaTw70fd1YHXKInCuZ5OE40r1GbBogIhlglO0jsT09iXpHtfJDJuqNkUOuOadJafjKKBRfR9EESCfq9Ao3S0bCqTWzkkHXaGdch7aJJgVWb0vyx3gwixj7QO.NxHi23NAEA4d4eqrbMtIXKCOnIQWDbuHVBNSNbnD21roXjgfBSwjr5a71yceIXl8RaOSNZV8GCxAnhcj.ZOBL6XfAkvZ0XGh1LmQ3nSl2adAocZ9MFJqIETXA6a_GLt1OoO9NkcYSOO3B1JgXKNU5hT7n9ah0e647qUyjv.IOBunZ11Ve.qv02PmlVpstecl3Bb1RLzy2weX99fnv5Sgzj89.JB.zaqY5MFrmBa7gTk6SKkgqEKLuaLYXQ6rJ9yu93MT2OR1VWZT3Nbse5.YJgmEgksy5_z7cAWfYjIpkZp2q0N8027Hq.T9dj5zXtjstTwTZTN88QXAnumN3pLYwMSY1iojLtr3VjrV3fChqWkznVbW38XOvEY08_YjkN8dJ5Q6Gw.DrFjMnaVvZXWxoEueMTbrNU8gLKEMEE550V8sg5o9Dr_Pyp4KlW9HFKGpu27E6Q167Qqg23ryEDVi_aIZRO2MaWgotWTwejGtWX8RV57fr7LVVT8U.4w6fMF5IE63IeKDl5B0f2a0AeGo4TIHZS47r5PehMOH06z9TBdBV6G0f5ZzNqnHSoIj_K1NQ_D3BGtXsQkTEAufJPBaXjxn2Syheu4JrYMojShIks1T8V0A6h.VLZPzFcBAmlR9uP1srVzeL88q80ZI1nzC2vEIp0I5vjZJUyLi.Dj.bvpAYcV1DfiNj0mKWA9mtFyJ2ijPQlErInRN21egkawRYIjA4vvKwwujKn7Q0JjRDLfqyy0BzBYMxd48Zqw7AqvzOcwQX7u7a6d06LqyRtCkTxaD59AX6csBh_OZ_4LCjN1HeW4Zk7ZK1ZeVNYhHnjvtBHyuvrlPu_TQamuup3jZaffkDWAUjmnVINhCPK0nAzQNv_dy_denRASeXlDnFLJ1XE1CY0Nc7zXFB0PnOpF4gSN2LLD2zO0DT.2NJ.AAC68DpImGBZM6UjG1qPnJD6RoBib1DyZsLkmslreaUJBh0cjpEntDzMc4zYKSHukNZsKDY85jFh5xsdnXFJxe0R4pDyk27WEW9HD3ZGzbuldhuW34M792QCLswKxO1.5YbccGHRMF6_4OFk90xKFcL139pcQssQ9f9ndci5on6eXc1wSt32Wb1lPuYEQguJiBWRQDtRPANjxKMi9Ixy3XhJlBjHQTcy4SUTy_TgTA7Afb0I.RnTF0uo.BxRJqwpYHO6UGDMg9eNQBLSML73WjJEdwXHfEjKnLoivnuYlAEyUFC9MDEOf2mT4GIWHdYAsEacC1x916IRJ0SgPuidqqF2UreJgg0mWQ1lsdWulF4lwQwPBuC_S2uPm0vNQ.OIbBwATTWge4G3I3INhuVVPFtd1So.gmj77hXprWxV.peQ_juceWKL4LEBw9t.9LfcGARIfTakk0Pa06moglZqtVf_Mm67Osm7teJzyyNM7kRKxmdIuLilOzXg85IFOgJB2BjbKFIJnTvN0YdRlmY1SWnaEfaoxgD_J1HtS2tolWXBby75pjvUaxqxkHR8G5j9UzdS0I9TVF6TgDVnd1R6fztC4x0yCZUyMN4.5yp3P3RdNPhQIdMjjVQkULmU_UVRwyEVy4.d4RKSfV2Y51sqNiaJtJR30_YUF53q7UqNjTSBkoXC0wFpH8Ci5Dq4p6XQ3fuRAGjOGF5Ex9zQLc_jn.sJCKpm2PIFgy4w7Eh8z7CWAVcSa4GN7hfDHHxwzsYwBZOPA1UghNokOh7M2zBJprxAOfYD45oZZlqhe2VZHEbYqwzQyFNX_ytZTzU00KqxfGmoqqGrjqc4gMdahzhFvQAqsIwzki_qKgh8qjbUFrJU.dutQ8LZFBPYEZcFew7LeI_GUaiqHRiTKW0nKMezQhN4Z7tVnrpYFTARol6A_Jy1aAEiSWyjRdqs5qtwRG.EpLt2YRtbd5phZtWYHcIpcYgvxKbzotVc1JGguNaYwD3gIWCnrPuwaD0gZl5stPZXA",mdrd: "LkXe8lRr2EzM34DQAjXeV3FV4S3rQqSewWv5sdjxjm8-1739242627-1.2.1.1-2g2lOqRP6T_MN9ApVKYClc1Y93NgFdz8tQtbmEWm_ZaJd7j5uVFI6HJvnAdGti.5AvG24PkmPcGSvD3HdKUqg6kqmiMEMt6KPPz1tRDj3hV2YuYIUMWc.xQphtJsaVIeROCpXtEdRQuvtDd87fAiV_jx0SY5Dj4qW5b5tpCXFBFCPG6daPTJuh8ELuy7pMK1mTT2EXlti1N.iwedRIeZgbRUJBlO7QNiQKHEsnZdYN1ychGx9xlb9pa3EfySx4HQiFXMF56HwKYGYDGCLejv229TRVAAo_HC6r1h08PuyIDCFLiz8fQXSdEwKPOLEGj16fcyV1N0Td2vr.1LBOnc96pCST7eQBIGi3lroFuCN4oAxHoZAIluzpuC9HHwhhq_7Bm0NC0UwjoV2CqVJqNVxaTLaotFZYPWvt3lbeBekZdB43fuf960iPwO1w7wIj_E8SijhJDGh9KeamlC7Wq1LHG0LoFEceD6iiVbQD6fLJDqMcGc8d6ZLqmqer1_4vNjej7Ivs5cm.TyGHqhhVmoHesUVYHDUKAWIi47.wy2mD5wImHG6nEpF7h2EQfzHK8MamymgXJ0dKc25MFSYDkHjCtqsJhXq1E_HJRXAsuiyoBfFCOOGdXGQPN547H_aFQLaxMjX.2rcKYSOmFQhLOs0NxIxSgbVwhNW0e0BF5OeCvw.XyrliBnMQkQkutwrfjXqP9a.2RSJUwcaaEAVcIPHujRdJ1ognsYp9Plf.zoXDP9TVOmsNXWlUQaKiLNd3WMiqft4W7AU6GfdMgBm_F7XFBZu9VGaCA7QLf.vWyUJ.JUrwgDK2bzwmbPEWYnMcQFw_IbaX28IUBSEJk.OQqXSyQEupRINWIa1aLv4jy2OL6P71hkIUSJ9319HT7sRif7TwRHG3zjYk_nYZumOpQjG885XlUZ32FGYllkoJw5zY0hNNdY4LYmi4hA.YwDGLV.WxaOwetqw37uNnvMAG_PwVje7iF5VyROfI2DhhtkcLVzql6_59xOBZljh_8MFZYVbraY1yTGbYdPMqYYLuwwFIqLF5nj6qbO0iEXmfyPwlyy1Z_rONpqp3ABnRhIees.M17sXew9Dnl97piHOGkCMsSyucBtBWrlgdC0mo5FBGnwwIIw_FXkkmqdt876Y1ORU8rw7TqdRJZ23uQ44jaKYt1t17DkfXpQBZG_pIkeEDFbUsCmZscv1nZ4_X09pilTnUOPHFIUjf64tPH03ZEGORbg6NYYDwXgMP8ntEuP9z9HooLhlgm2Dx1ArvDDJ6QoUv5oWl4haa03tuy1XozBz3Gl5c.FUp_Mtjjol2NV4aa..X99F_bPdeIV94DVAbUDHyGiFikWtss0F4H8zOvIq0iNYMsn8bvp19x7Py2.Xrigko3MgKleFVk0If3G3n6SjKlrFVOkNO8Pl4FiJZl_rymxIdZ4B4.vmwLQbY.4taRn8HhAPBps2pCPuvvYl0.5J0XSbO_ZCBFQPAvpq2v7EsHfJiu2_N3Q1haH6c6kBwVjeqqWku1kavnoRUK8.xmLhXrDuSnGug0S7dte4xYDGx8LXz9aDia_BCM0pv.Yf0rne3iXm0JNq5TOFdXASj2Wj5BgyqNFOPm.ymQli_gcutul2ySK_QLlG_YJgn46TH3gbFylpUAfBJfjYchG1y_BAst.zaIlQLROJMPXAyRPkBEDEqzGU.VmKCMg61HNBeQL75cvSKl3Sl_lMFZV9zKBrXUtQPGup_1nqb5z5w5A6t.fV68cJK7t37SF9RK3Qvy_1w.WtYC_b3JkcZD8NY.YZTqYJmUiX4nmtYI34Ygbtyd3khd5IbErn2wQWPMylB0"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=910111d8bfad6fef';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\/4178360529?__cf_chl_rt_tk=ab.rhmvuLrBLaw5VOMurVZWxBvrRQFH3wRDUwoZQvxs-1739242627-1.0.1.1-Tj5LTbNdihI7P7tAfJDOsw5ACduSo5pNJ9Ek4AsXTWo" + 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