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-5098613247-gov.columbia-edu.pp.ua/post/757696699598

  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,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSI+PHBhdGggZmlsbD0iI0IyMEYwMyIgZD0iTTE2IDNhMTMgMTMgMCAxIDAgMTMgMTNBMTMuMDE1IDEzLjAxNSAwIDAgMCAxNiAzbTAgMjRhMTEgMTEgMCAxIDEgMTEtMTEgMTEuMDEgMTEuMDEgMCAwIDEtMTEgMTEiLz48cGF0aCBmaWxsPSIjQjIwRjAzIiBkPSJNMTcuMDM4IDE4LjYxNUgxNC44N0wxNC41NjMgOS41aDIuNzgzem0tMS4wODQgMS40MjdxLjY2IDAgMS4wNTcuMzg4LjQwNy4zODkuNDA3Ljk5NCAwIC41OTYtLjQwNy45ODQtLjM5Ny4zOS0xLjA1Ny4zODktLjY1IDAtMS4wNTYtLjM4OS0uMzk4LS4zODktLjM5OC0uOTg0IDAtLjU5Ny4zOTgtLjk4NS40MDYtLjM5NyAxLjA1Ni0uMzk3Ii8+PC9zdmc+);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-5098613247-gov.columbia-edu.pp.ua",cType: 'managed',cRay: '91ff1fc4fde32093',cH: 'zgshEzuGFE8cOo35E4V0YXa1Yj.Fw8dXEfRzVyGRY6A-1741906581-1.2.1.1-dy.FWuAW4TtgCk5CmcXnIcLelUQf4Kw9U8gqeSC4z7r9mrdnPGfho4neGP7H5qa0',cUPMDTk: "\/post\/757696699598?__cf_chl_tk=pgrDAIFQOLuGjHkCKJC0XA9dowWk0wEVcuOLOzcSHW0-1741906581-1.0.1.1-qPb585_nNlUtcaewWcT8rdN8z_48jVMNCq8Wwg1G3BE",cFPWv: 'g',cITimeS: '1741906581',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/757696699598?__cf_chl_f_tk=pgrDAIFQOLuGjHkCKJC0XA9dowWk0wEVcuOLOzcSHW0-1741906581-1.0.1.1-qPb585_nNlUtcaewWcT8rdN8z_48jVMNCq8Wwg1G3BE",md: "1.WMqZgvfzfAtGA0tgLl9v6igIQs0KJQwsKhWrhm2A8-1741906581-1.2.1.1-8DTu7wdxtsyyr0W53zMLJNDzoAPNrEBIcoGrCjRaLV2ubfKOBr0Ry9XO3aA79ieO1JOReYAk5YrRsoDSluA9gQ738hkTmj3ONxRdfQpHoodDHZEJzSz.agmb8Q3aOOiFjYOokhPbOvew4CvlPorVmp1dZbeA3RS0pT5kK4pVoR4GHQufuNKI705qZGXQnNZbDKXIxrSCNnp0_sHCZPeQDrpz_mYtbdd_hgiprGkw83dt5dnOiAxNSb.J8p3SlcwVJhvhZyKqGap1k4UgKz9cwzdyDVojKGlUknIM3VnpG67caqBL3b4VgulFKeAw1EkBQ2yFfbajQ22_pBv3kgwV.E5hMM8pBPR9tv1t.DIbHjFox7EhFK0Tg0w3k4.GpgsnOP5TtXy2f4Yn0Yd4Y9iqeXewu1ezjpSpfu3rgUd.OmqUqxpLJitDJWF96fO3z7pkFO2vlhwbRlZc9rUCB57dI0RlSkjMl8Xm5mVf2bXfivbwErq0bjZjVUroKHqjH6BtmBANthLPk7_QbTBMT2n.6XNnMzpNkj7RR9u1.Qo_OYR6fCiAWv9hL13AHiZYmP2_VhOq5jG3Q7METUfsvLSdglQEZiIHkZYiNYlcpgpSg3Y64tLDrMyroSRWGHDOgrG_vxELKnVcU57PyoKrCI0p3_MhzZkreo2paXVgXGTjatxtpwNrvSuIMu1AeM.utVZwTWIt2rgdUYwgcvpVkOBqPn_UCKt5EfIxNk4k0CsHaNF8n33vqAhEpBBMkxKEdK3UMsrr.t67X6E952j49KWtfgdbVwBudaWIUGyv4A2IaLdD54BU9n2Uxz4UCJRfeXk3Lp.xtGrZXwSs.C2aU8vD6VP6aYj_tWXuD2vVhy5Pu.lH09TR992HGCmlVgAGki608THbYJn_2s3gCda5OVK48wgqh5554Q23anDEwLnSmkCbZ9HfloEo372q_2m08g_PYApX_Txv1fIBK25I8KifYA",mdrd: "NIjDEjWr12nC73BkZrZzVbfK7B97YAoewINPPQFE4.8-1741906581-1.2.1.1-OCQ_DTe.i6YNto4t92X2liGACQ0xxkj3387edK25OTffa7mG2dOnQrOApExUNpuLgYlD_My9CFdP2GGVCCuBWZec6TyfzyubCPC05AHrOVdHxYDx8cpezboRKwXieYO.b8WK.2hfrLEUf7vJEGo_NTvDMt9cAZRkIcmZXkU98UhK3Mcu48uXTUH1b1BviZgN46DeICxCOhRiXJD6Mlm2PGHMDKS0JdB4SdZUQdKV6f4G0a_sK9nf5X6i.X38eKLUJuvHt.uRAP1P7pCBKEiFO7LqW6l4qh19_Zk9HigSiDaY9WwlcrXkK6Tmc.FNiO6685sBVg_svqHx2zGUiRfHStQeikx4iGcWdI1MZuzYiofY_n34iSGVWmPaegeBnXZcp2Iq1h8hoeWetWW1SCrqrrs1FppwU1lbAt7GI4iF5UkwN6yS6_IJyBOP2rZOMMzpiLzgu2nMvrS9J7oRi8QKvMa9KeoXCyVp.6hYN546BA4O8MY.YbRN9QlYcWfwQvIVwvYevsIISCuZrwnWKokLZEgDsOdMbi4_74u75.DX_kEzhEd.v.TPC6NA84_A50tJz9uS7_BOt7FprG97YRN2IzL1lbubM2bdYNttla392eDRIBg.bzW0n54Y3nSISZVd_TK_xJWz1.lW6VAejrP2IelkrdImiBPZCxWOXC932FyXVWWsvJ9G1o3Xl74JQeD3o4uJr_Em41RQ.pZmUqgYW4WpsJrEq1R4BuW8Ef78V9HizHnuI8Mm_JgD27R1fMqn5hz_seVFIeKMaHmvZqGNS4euiCe4a8xYuhVcRTtgdOHIycK19qCLW3GrUY36zw1RBde73e0KrAJiROa0zAQNwVmTD_Lz81yFfksFGEmrOc6h_PtJ3mNb7l9TNJgGq_caXcphUvD_CoQUPo5gKNyAovB5wTrzaQ8DK1kW8UhveBGfe5Di3GzABJ1OpHEMFOw1PxohsMy2eBXKdAelj2sv5eOsrYe5XHqbpw5uGZiwmFMFlbgulwx7CsjohpuWAIUSi09URsGHMi1oXhNlAeXSW_ibPf90EgMNRoiZem7ZiG5ezXLcZ9z9kZ2WpETfGzdC47fIr6BM3ULvVzGY61.LUj7NlSQRWfqewFHDiSRwVtHprdUN0bIbpVT220WXa1zWrPgQ2AsBaCxcF7Ei23H4tF_EHzSc9vU3791fh3LVcnNbX_Fk7gtJVOfAL6z3l1kZqc54OVzEtUb2y5YD1TbB4pUe6Bp2kWVK.JPX4XARMT8EYfdOY59JYI7yd1xEFPooC53CbE7Av2d8Q_obifMu7U9bv_eXnt34OCivBSOtMLm7NZnPNtfalxSl8v1J.vBAryifyalhvADJ20QriSZVhQMcfyeRw3wLM0h1e39deJgnrQK8tmbwaRJzqe8DPuxWkqX1RT2o.WI9tUY_HZc3KcJXPZ2NqO6xCJffk2q3Co1DwTNyRIT4kgR_jJ588E2gasv6a303yQ7ptc_fZoML6JrG7KDs1EHmc1xXRB_zNW0Efu2DVVaLSYmsyX5Iy.RCBox5YmcDqHnaw5DmTqSD8ZY_Uyfc2TtqAChYFR1U9tHmtuXR5HwS6c8aOKxLddPur07mX9bi19V6bhhyNUi3MACOiirFTc8RUE2bEdJCFPTrLzMf5u6Keu9jKNRIfLjSZ9AfkQ59Sx0OP8Un0.ZElkfO0ysHq7hAkWaxGHPgMtuByyETtU6uC8rC3jqXsBaOehm5eQ71JKsAdvAz_7KpgCRDRkq9dkFxJ8hMVeZPSTSYRMyi0fLSk7vyzBm0XolPo6S22qtuAMBfNdygszDeQBdxg7b2jZqWT0NeBp2EfpcHPorGeV_gyxP0bKfIHKdRXpQo_czEHzB5GjbohsZjUg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=91ff1fc4fde32093';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\/757696699598?__cf_chl_rt_tk=pgrDAIFQOLuGjHkCKJC0XA9dowWk0wEVcuOLOzcSHW0-1741906581-1.0.1.1-qPb585_nNlUtcaewWcT8rdN8z_48jVMNCq8Wwg1G3BE" + 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