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-1573069842-gov.caltech-edu.pp.ua/post/1573069842

  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-1573069842-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fcc10cac14058f',cH: '1zGWFC3re6d.AoMYa2KWtchceA3WK1RATc1D2W088Yw-1739197375-1.2.1.1-9l6Ipij3ggBeYfusdMenslZxkZ_4EoGjiA4pOwt986JYFW85Shj5R4PPfQflnD8T',cUPMDTk: "\/post\/1573069842?__cf_chl_tk=sxSJG8mfD8hnVm5TSdfBkpXiqQlzNvEGcgavZSxWtUw-1739197375-1.0.1.1-KhvteXWpd5AtymI43._0ZPtvSExq_uilhE1PwCoAoIA",cFPWv: 'g',cITimeS: '1739197375',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/1573069842?__cf_chl_f_tk=sxSJG8mfD8hnVm5TSdfBkpXiqQlzNvEGcgavZSxWtUw-1739197375-1.0.1.1-KhvteXWpd5AtymI43._0ZPtvSExq_uilhE1PwCoAoIA",md: "UUGGxiiI3RYaJTLMVHiZAtBkKCKoUKbldUbRKgANYvA-1739197375-1.2.1.1-VG.ElHjtuTFb0ywavj0zL9vkCXg7FzPmAfL.j.mioMdSjZ0GRexIrbBxiW7uUKD6R2SZCop4EZQCgZBFiKQL_nwUMTpAI7hNYzjLL4RoRspbnODW99MeuXaqe4XId4KVrsy8VguDsxvkESJql4wgd07QCcfqnO9ADQ4FJq2Sp_JZHEJRfIz53l.h9RrEeMkuLtZYEoNN9mU5EMSPBzjsHNTIcexQTQYgJB3p3DDbL_eX52uTMFwNCeX1rBXIcCb0fDHv.14_tru_8AXfxSs8.oVCqep7lHjR4QCCzsUlpZwZL5vMFjWxs8_h_PiKE55cIgmJIQCcfQexylZ6SBmimP1HgCprPeel2BYUnzfg3B3rOtHMC7LSduDT59f99AwlKroeDncmjNTocQL2CGXyflelt3wmz3VFf9zpfCAKWajOhW72jeOS2AXEHnkgYS_dHYZJ0Rm5Q9tpYRJDv7_BvStRThywrfyJt4D5N4c.drMp6nAkgtP7ZrjBZNKaJ3sQf5zK7EDeKelinaZgyZTnQZJeX33snpw1ckx8Za4ktqzaMD0USl.1QeGiDU4LD_FNv9WY5HiJ7BNkFYpy_QzUEdBzGQXTGY7PZ53NNuIOZ24nyFrH8IiMimfTx4kxbW3gaYgUahy0.2mkOaAE1Y7_9gp75EtyU1NgcfOybeyQRXXMkl5qSBEH4ikWm2wlZoKFEOANGYDm1ebP07W6DZoNj4MuyGM8FTEKOgFFHeeuMHrBfAulStudMkGmV.zfpTDmPHyDvZkN0NEIH0zIiCTMUJLt5HBZLXGmVNf3iLRNSNSJKFEAgJ2da26sKtScXHyuyIwj5BqHmchjhOV_EgAwVPCoyV9tCV5VZft371g7JeEOw72E7prjYAnVLa6XOhBLymlouenA6nH78KMQ_.AZEXaYUA2d7hvftQ.E5q3lkPDfCKiRY9UiDh2TRRWof0oWu9_2CPV31rIaeYWioFF0jNtvpGjimJbsfvHf0ln35Lg95T3b8PAkj8TvYBMu4N.AWRcyqHCqDKOXhDfciFoCUxhgtq389N50PFispIh02oo9oDm8az7HRAx.77qhmS.aUyOrY.Yiy5u18bEp7aNq1Nnd5kpfQoDLnvKNPL9AOowNBfDocculgLrzAyHheW4y1er5BqRafZb.SbHCZ30VfrLQltP5lT7ETqF3sqgoFCmJ9c5pCroWunpBt4vDxmFWZnWopBxQJzTya8U552ngnJhiaDCv6jI0qB6MnUbxNUnSYzadAdkqoyGGDExr0PdqbU0T9G6YW6XHgJMfNKBwi4swE7xiADVusocLFYi4CKzbVRN7xZnajN3tulWEnoxX3JF3sSf.iyniYE2TFAuJb3bsJ44lSnprFbrH1p_9DzbxPhgELNmGwLT0S2lUdxyqBEiDSe9bK9luk2VFNJTEctWjRVFB1Z_7JJvktxRfmeVaotN8UJullmSu4O6AQCB1xa3uGh5HU1TLWaR0wa83dv9P4EqFZC1t7rjutfwRNkZXGL0SMD1O_vrdMPcwj12Yu7LUGjgScXDCVlU6UqSn7dZ1vvqTktX8wBgDachQnKeiRuCh9A_AoJU_I03Bco_kO51xrV8hVLUnRXZpI84Tb3j_ZdMlNl5Hh9w_SXSfIQRHTlMk.dWu.KhHE0XKg3GehM9SxIFPfvQQ9E99oC0.TOpILEiJ9xYpK3Bzc.GFmpK7zRPFu6vSeUzK3YerbMCdiG0t5ZPC9shQMWXcDTwxo1KjkWGTPieIJ0VUl_RSIBtrZ.WfALTX3xIHzLHkRy4rjIK0UA6KpB8gMvSqNoirLrfXMBH8KqNzeXnB5zBRKssdk0nz2r4jasDURByefra7mWzE9usYwbVHy7PVg6tjkdcTcMojSfwtuU6pelbe_mpI5jsrLK2rjgo4GW9djN7H4.xWlQplRwU2WU3Pg2eTxC_wx.Gq74n0TPji_KQV_IRKFkvlRJrR7naebkbSMuLVhdGegKEcKqr7tdluTXM8FOHzuJY650hiESnffbOMyrNHgZYWtd7cJueHwJ_bO4sU5OcKbgb_4j5XjRwf4IRHO3j7q4kvhduSYhKOophJnrfM12luoww2wkWq0b3gkd5aE4qeB5RRkjFlU0GfgA8oi713A3pZJ64zTfXk_.ouH9baIbeyJiYnR00ioi.UrQvvl8L2INyYqF28C6EtuEWIiGszNZoerc07IW9_1vUJUK2NURgU5mM8Aijy9wZeBsAqwOYMgE07hflw_.r4LB_Fgg",mdrd: "gaJ20Luf2jf74lM8rHd_QpGBoFg9DdvyhBtZY0RiHVI-1739197375-1.2.1.1-xkL5SS1QND4V.Ob2hW3kYFke6eG1UF6t97rZq891yTvSz6xapux5Qd5UsbYmtxLnfEzmNwtuszQ6.PB4jMZaf1CM_LzfUy9PibWmR4NaBTPqhicDO8Xn1T3ks3od50E8ifbY3EQgH82Sam3l2synPE.dDvyWQPOteVuyTdcy2pfCQ5jnjo_9lB4AKT9CEff_wnZD6E3RlDJ4xifhhvJgWIjYKTE785pN2.nxxkgpWvS17S_Mksu6_BE8v9VmQ7FM0o7.MzZG1A1z9w9XCvVSrC_6me5Eh7F5zEI3MKvKEClqj2b7k5ouooEGNTUH2sScUDE1RJC6AmsZTN05uMlP17pBQXUIAx4c_mE9Ra5aj_TeUoWnlUZ9opQ.x.GqVRRXIDsOrS5ClMuytDEHlyzrYqbhcTW0eTWNzLWbQHnjG1ltCugTYv_FrOIlQ9x1xl7IdM58GWH3QT0GTHCfUY0S4RDxBuPSqIB0XukvZjnI24ZtO.Gkd9B0I.hB.JZQkgBZF1FpFPGWojYhx_xWHyi6R2n6BGBHhvbMUwBFC.fXOvlMnhm97xaMakwW9Z.NmrzsYBbg4.VEwCU.HMcrXYKUwGYrO51_A7grMcbQPfvo4bGuhaH_cGJYErjpCSnJLB6Vo39ac40OnGUM_stpTF8dKGDy3FWDPYKidsC41uhIMXGzmg7_7F7dDeR8f0_lBoCbDDUDboRKz17Lww2k_MsjWUgkMj_naiOLyosj7CKwvWhiwc_EAR01GmfqK4aNEIGmVs9Xav5JHTipmj7_m.aU04NMa50A3CFFK8_ufgbu4QwQ8P2T0vOF5DNyVXk_6AzXq379uk23ErBHVBb8cbBtbQF1F808EQdBUQtvmuQW69e0RA_h.qaA9xXFQ3S5VwlbNUkl.jlHohV4RnWz3iNKBhsrF64417pDRVU6uphMcsSUBxsElv340drKEb_F45.RBRgv_LyxkRLL.1ebqj2PO7Jhqn8CCkCNgtUE5kCYyqoqAVRbDe2Tjvl6wD_PGBDhUusdWFcEXLhj3Wet4q2gR2ox33RmqBZwYls5KW7zgTwIqNon8Yj8Wc0i4eA90mds8zYJgQ2zSdOoznNXv6imdd_X1MfL8uO3T_vhysnvK7ZJWNl8iRk9npSMxiYRWziS..JHvDFaPmHYvawZNVENgNz.Dr5_DHdF8xga5jUePhZtrFVXTzbeTvatJ99wbAatqMUGS607nivgwIhAE3tnsbBY_XpH_Q7t5b04uEFMzoS2nfQKo0r8F8fHlRqGX8.X.4YZsGvjydWOGvLiDkTHsj8mCNLt9WeTYbVaz40KojhyEKMCw.qsfK3DihQdUJ1YN3B9QDEN4Qd.0WU0.NWurOGz31o_eStzUpPWYzC415FJHgKsXt3hm7f.8wYYUHr_f7JCDxn__vsUl3ZyhtHOOEv4SyEhqQNUdjYXgi0IWR9_58yaCCnWwxh8HaKrutQ.LNElcHndBCuGm0YN2_jzz5ieHxOoBj6LbQMs8uXtauGp_XRk_ya0cLmAfz0cF2c06Vfvj1dHlA5yqgWMEagjd2_u0XvsbPIRy.BjqOcobGA2RjhQU06Hxk3oO7kO2pUt3yxCVhw45UaA2QAM0MtnxWKb3ebhmD0k1XHE2jE9.xVgR92VzlvKdgP_kwPSqWq7N0PwDuP.R752euQFHOJwcpUeev1c0BWaXH9370H.dOoK_GCfH9I7HkSl_nl9n4uSPystfU38xnRZVmJGfkJFCHBlfBybWUZc5ObRJIz6hLnTcKhgX2RW3ZIVTEbnnwsmAhoeCnROQ2Bg0PsyZJaNeCFHzHhvB8NlHGAoIo63tmXg72iRqhotTiCDnbDCAzit"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fcc10cac14058f';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\/1573069842?__cf_chl_rt_tk=sxSJG8mfD8hnVm5TSdfBkpXiqQlzNvEGcgavZSxWtUw-1739197375-1.0.1.1-KhvteXWpd5AtymI43._0ZPtvSExq_uilhE1PwCoAoIA" + 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