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-7213609845-gov.caltech-edu.pp.ua/post/562274019548

  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-7213609845-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90ff732f4e415884',cH: 'j1u2pKHCHnhN5wcdmgtFeiA1odSqlA9FDpcQ80vLeCs-1739225643-1.2.1.1-sdmrUCX3ma6RBiuNyitkYNTvAt8ZPUnKSc7wDPsO3Uii5M82_FXd239zjYVenL4S',cUPMDTk: "\/post\/562274019548?__cf_chl_tk=y_Gvo28pgeT_eIpuQ38tdzgdA.LI5b07UFRKLlxlZb0-1739225643-1.0.1.1-lJf27CNULHgC0GonyhHU8wBDgwvP.NlYa2YpKYu4_y0",cFPWv: 'g',cITimeS: '1739225643',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/562274019548?__cf_chl_f_tk=y_Gvo28pgeT_eIpuQ38tdzgdA.LI5b07UFRKLlxlZb0-1739225643-1.0.1.1-lJf27CNULHgC0GonyhHU8wBDgwvP.NlYa2YpKYu4_y0",md: "StpqGfw0wcCxuOwRIULBrWOUbCOtT2C5rBPBXq2B3Hc-1739225643-1.2.1.1-iUXqZt2OVPY4ws42HYq9LOaPFVW2jgJYp05NwyGXm0qMuGy9.WKc2meN_Pz193UeejDr.ZINGUDxQBs9x7A2ytaySHCtoSuIwngRYResuloYIHxUybi8n6V8Ecyar6ZQ9ZBHeJrzIloCFBH5qVbPM1ZWAviTg80Iyr5hmJlb9qmUBTXGSkTU6JWxruH2rgDZVCkiQxeoz2rPy4CRCgEQjE.cUZe3OQP8j3skMNimRmgJ7COpGS52WfEcluUa3U6IKCCQFU6IK55XZmdO69GcEhzV.4Qg1Fmm40fNpXseTBnGZcVgEF7gjt35qfG0glBW3fukHiu4oSySlJ6PKmCuDJ5QLzlsCl554yxjN7JGGJncjJ0ljShJZ6pYGnVQyNNe8BNCi1ML1KOq.LxJx.Fj8X9ddt0z8gCJ.LhU1KHQpvNprLUitAbHtVCyhtnrENVJpkMEALlpVUynV0ef_2u10R27ruT_T1T6eXrINuj5_nYR0EH8A8ydf3mhmB3B2r_q0dtU7FTSRYwck1IF4ZvmzcbAQ.UPzTuPihErtZTVbaORRzm13MxIjvHJdxP8mwKMnO_ASg5ts8rUegRiuJcHH5SGiKA7hju8WVXXq98v0eYUNn7LueIQ6YW7USRp0m4BFxqMU455ce0f.Hu4DHapp7kbDf3NOaHnxn1UV2D0DoZmr2MRTYGJiC.GSiLL0e3hoUQJvSXcEN55Jm2Ar6bB8gEGrfc.BfnFZ9JFH7C51E1T08pTDvqxIKnof660REfy1nZ2vqUBUXoB6UpXIR8iQWTVlgLuZx9Gj_GKGLUPf0x9Wm8xsRmJk9QKs6peOT.lUYpDzLPBl8J1YT0pFEIX4NmseLBNYdlXg97YLYio.lXIv5k28y08Kk9Yaklo9uOreXlsfsC.twqKInTMtseeseOK2tSAMpn4eaVNqswpBWzHFm7yMR3HUaYJpJF1hNaoUZsb6DpXATZEgwBz5yTvSFR5edTrtcysIGSF1Q0rxENv02s7tYyqaLZOaTMmY9kR5D0aCP0I1PMwHR2r0kK6KRRwvKpV8Ko1CLxoRqVfYHEbx1VGT942HgM851QZJpbcjzYaHcbCE_Y8jgeaKfsiBuvudH8m8eVUPVyTEHYIi4VvhNASO9_2kBG7DHJwZ2cS6V1HLrmSNtyBDO7WKHWneENkytgxniEKsA6Lds1yL2054zuShA7fCgL79lhGQXQhnjlO9zEAL6a3nHSHF8T9C50yDmjg3fqGr_UuCSWTmEmmW1a54Z129kspKrvB_GOBrrz4f02L6C_1ZBMCkxw0jXyKrBhwiySUNu1jV0rdMJmTx8VA9SFno9Q7OZmGZWjmlsLRqNqPwtEbKAeVUd6SlR3vhUhm0L.5c9FKKVqOP2xwvLdXK1pj1yQ3DL5OTzvMsVFoaZ_2GtzqXqnS_LiQ3g.5rUY.IVGz_G1SeXIkSAHZN8gqCJST179TNQeL2ouY00f3pz4j8ZenXb7Nh5_wg..rSg3eNgrFT1PUzrC6V0jBri2PVIrBALeuWeIudfxlUh4XpBlcdlTok1GwDNGyVe0KgaS7xr2lbzOMfxoWUG.cF_36htisWQq205AwvdgApLR0EaqM5o_fDzBS1B0lhOITvUfE_uMDxnavzg4Ab5UVURVgSR5di63NDWAKt3vWr0g_gFHvonC32HKOKtPkOOnJg6d.OetHuYqzzdNzS8cUEOFNPr.wkANKB05SaWwliU4LriDGrOyzxQs8snhWkFgB1V_AovonQk0GEyt581dTrxjaY8NpdTX6sg4HRuFt1RLh.berRurCXPVgpRi1PxivQcrQOHZ3JwgFgEkOF_YWcmUexR6Yfs9PSY_EiSTCSyukSraQrg3iMq2UNUMhK6raYShn3h7V9Wm7rXVwMh_pXjkbYIkxk3.LO4nmCFhIh.mD6jlhzOX3aU.F_pi3mHaWOj19YMnj7TsLCqf8tjK7OVUcVUGAopKqKbr1X8L5azNRbWQG0qu182ZRYkO09REqVLgSWAiRdEzro.6WInvZYWzJbA2m7qhch7xKQddU.oWhNCG7gJHwbASCzl5Qsq2YoPevUPl90fV6.gjwGgcCmw8WuqgZtA1wVlf259RTx8wC2t5ZRANNzgHNLzDoL59lu2Fnb23IRi5SWRIs7m8HSjZtOuOnZ5gAoAIsvrzRnQsW4Yr9yyXSVSK5Re3.kmTKGW9jT_uP1ToewMOvNgBdT.wZD3jVsXucCp2TwQ30rPHYS9QpGzfKVZDCpLyXXQ",mdrd: "pUOSbQ46vAJHyPJe6tRQRju9rq02eBqhlRO15QN0wjM-1739225643-1.2.1.1-X0oRkayan7lrWnDhC3dhqZ3G.aTAQIhsUWjrqzETVGp.pLS.pnYT6nblbsF5A7Shw7b2vf1nqmDcCzuNw8gi2dGXBKcPhA8tz1XGegfjApStwqbHm3kWihFPpqg83kNBCqL.f.ziQhR70e_U9gurPcYpQhKrZ9PgbeCy3R6teXLHb30VYN7MuI_Xu1s9x0Z8Il_18eaxxHdMKRzWW7CEx8IfHQ8W9wtExT03.3aqNH4IzIQu1m.ca.ek7m6e27TLNVAkBdX6OfIEh5ivL1ZZxHLEwygtwwim_Uo7gAeDdNXTqZlBY_DBLDTnpcBetNGJ_Kh3uduRGRMgtcanSzu1LR5kwshhCVh6AfFgm_v2pgbF6NpVWSSS_6Lf9dXLLAXT5f3GjFqFcPy4KpMK3ezbcImCA25NUOpZKcoTVdtW3ZvZyGI2QRUlefu0pVXqh_4RlwGtPOrICEVOTnbMcewrNSNX9xERFCqfmIjJxck3JIyoIXCQXelg3Re2UdTKxuNR_fKgCr97NE0ot47Imaozy7gSov8LWhjEG8svpySh8cEJ18SIS9EHzpWVlbnX8K4T30abc6GOIAzHBu3QbIHpWUGY5IIVrMPjSDYIlS2H4jGbBnkN33dGokIOKbhNR_4Owf6QwyK4JragHCynJzsIcHJHzODhIrbhbeLUnRhPzi9pSWZSp_sqm8FAzGqflMkDdOYEhxrsTiS_uihoURADWgcYk7TZnqHdDcmk1K1uosWgYmGx0UxaA.TS86Uxt2FiSfdMpDF69o58Gj4b5XQepjEBh.WgJBh5f3A_krtMZ_n0VA4t0sbM6CyRzIB0XVbcoGUfqU__bdUOYex_rsXWnM_tzy6B57kFCHqM3y8L_NQPE_Hr9CTM.3z2NeCAjt63DXVCkd6R1jlCwlsJ9JPXNe6Ok2pPyZivC5XXgngazxdpttCZpNxS2AyDNev4.1HavZ6zNS5q8Flly.H1YqtLQKL.vGePifdOX4bZmkStNn6XgIbf2XMJVQGIO97IbwclFdHjXCFDxyuTU2_nwYTQhamqC6Y9ex2oQSEt6ygKevMoCGPYorgygt.lYNyHKP_jFzZV8SnV3blZXtJZRAnfaKBBjgFvI1niaOf5aAF1g_Jn0uIZQiZQK0GB.hzMjGtG4cxOP.d8b2fjK0cEzpyLKW.UF47kbjmZonfeENQw0JTMbGlgGPyCO2pEtLk.sF6uqmyrHaAzjMZ_fyQUxfgENFF5Maz.vJoGjC7OwSlSJBN5ayG57gDYoiZ5wLopAD_goszOFWmHtA0TwrIiMpZpjfm_o169EJZh8FuEgaC7alGdsRbedTuR6R0YZi5NthGYRyLDaCj8z1wWN.ExLwXiKUg2mVrLgbAm6fljTz9p.TnEsvd8Sr5OlNeTaYDAWvW_3R.kBjKFerpJdMUP0Z8q1xON1sz7f8Zw.NqHX2iLev.hqLL.cueEPvVyKg9wzuXpnsWIH_8e7_HaFKzGZi4Tp.RlF.Gs2JdS4tVSWM9i_zZjwzcheewjYf6xLTaOBk0vdv7EJ4QUkYEsEuyvTCNmWVeK8OBRpPTVsR2TpDMiMkUqXo8evLwYyqsFh4QBDsKQSTE3_pjZxnixns5Nu8TOrbuOwNbZH7ZPovV.HD3L6l4TkvynVyNPM0PGs6o5opPFahVq0QT0d_2mfubTbIZoOJagN8KEbpOfE7R5Lw8IfSh271rcGMtxNZEdiWboyutCEs1Qeg7GLqNvVmRWlhzxnXo2Q5CapceOct0I.PuQviRZ9Or9poq_ouBmjpzObneIjYf9czAoUt8MQ3Mls168snf5PY9OHbddTTgPy5AjwN4uuNQH7Q1VYug5LQZSAgB7"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90ff732f4e415884';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\/562274019548?__cf_chl_rt_tk=y_Gvo28pgeT_eIpuQ38tdzgdA.LI5b07UFRKLlxlZb0-1739225643-1.0.1.1-lJf27CNULHgC0GonyhHU8wBDgwvP.NlYa2YpKYu4_y0" + 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