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-9578061423-gov.columbia-edu.pp.ua/post/107937337227

  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;padding-left:1.5rem;max-width:60rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{line-height:2.25rem;font-size:1.5rem;font-weight:500}@media (width <= 720px){.h2{line-height:1.5rem;font-size:1.25rem}}#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="360"></head><body><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-9578061423-gov.columbia-edu.pp.ua',cType: 'managed',cRay: '99af9b2f286d318a',cH: '7wlZCQfa4K1hhjFqym79m77V4Cy98FCAjYGrgBD6PPk-1762547612-1.2.1.1-2QQj2iclQn9TxIjS0jbZDOyrfLcmuk5dz2os1p7ZckZgIKhvBrtq6UneXnVeRzRu',cUPMDTk:"\/post\/107937337227?__cf_chl_tk=srxDkVRsw8MdlQUeecfCIGeEuHb36z3YHb0SZ2iUMlI-1762547612-1.0.1.1-2iQnmRKhghje.cSDX90YtY.1d_IzPDR08HlweDWWxtw",cFPWv: 'g',cITimeS: '1762547612',cTplC:0,cTplV:5,cTplB: '0',fa:"\/post\/107937337227?__cf_chl_f_tk=srxDkVRsw8MdlQUeecfCIGeEuHb36z3YHb0SZ2iUMlI-1762547612-1.0.1.1-2iQnmRKhghje.cSDX90YtY.1d_IzPDR08HlweDWWxtw",md: '37pDCiCQjwdh4Exa5KhvTbYldmW.8drgUU6eW48W1Dg-1762547612-1.2.1.1-u6iDZtswdJtvfwbAlZRnul4Dp0pywl68Mohhg7oh4Ji9FqrajAa9ggjl9UfFDYLO_JkzBrVci3StEQ1cc3VB2WOJsk05t4JXyEuilAWdq5Qk76kcJJe_B6_IiCC2Tfs14vVZUj8ZiOBJQ2Xm6koMEDDw2mgZ.KwAZDLoTkGp2PijWzuS0.uMuz1uAOxctk8DMi37Af0tGOv8WQc5_GE5mhWnDb8SWgzYYAzraCUMFPRCiqmQmLxl6Uw8PkPjkxKxzlPecyOjFQrUc0cGT0fRnUseshbrZlusL9Zf1T1.jgKkqDO3g3u_wHFM2wOXOnQaXAVjUpGwQ8lmQsEwOaliCBFMhricWFYZ19w.5m.uIYew5X..4gcua3p3IiQp5sfLbVsqCbD6.MXeciJf.CFL5Y4H9UjxtO.4pQjDSx8LCMsPqbjUIYRPMwjCOsXYior21iCkG9DNo_kqGmOnRp1EGFCTItZg31Pka_TiUawHsQlrz4b5rOmxWlFZR1GiPYXOl6q32UdFTVFTPdAAdEkW5sUH133FykCHmwdQ70y5XCW4xr.xW2Mp56QpH4fGIt044DlZodb3a0xVqJaVOsTzRsbSmkxNUduzICBALXr8yQ_eOrmKOVjaBr2iaPDsa2jYIdjJ1KrW5orsMOnJ.YC6uJYkKGZIlLE_t.Wa8XQfxlAisRIHjzUPAPkDMqZHWA18jCs5EdGYxTXG6H7iLC.NLHIL3U6havJz9dE19dPlLjTCfQx0LXyC2.ewrhPfdwQ01BhnM3b7Kggd41mx2q3D_yL5.F4umLiEse1RFv9CfnKep0NGof8zN2H58WmBayAdeekuXJ3Zxj.tL_iT82MEKLzZxZt3j.eqy2tDpRrsLL8',mdrd: 'vrxQ_KAZlm51u0IVZoegwu1X9yxJKIMQ1fOG7iB.Ikg-1762547612-1.2.1.1-pLQ2fqOuBJJuYWYmGSsZhna6ReNp.G5ubMRvoIFjtAx3Bu62bwUzKcjY0BDHwzJr5zGF1jHbh7zYF40Z5bEtix.8tmj5dqN2t6GdSp85bcpeGhRS04p8LnMAikrDXzPL_icig0WeNfxV1b_dp.FKnq88pxM5PByvNn3JMLUgg3mUnhbFza8V13DlhnAxuuA.IH2yWEV0uLOkOa6C_G3LRrNmlkAA3xx9EOMnxKFzO4K2nTqjxNak4KEIQdjVbux4l5__8L.n1a2ZxGR6tbWtaxeRBCvcHznBeD3Ztz3Rq01sGnz.hK1WAGWUyNko7e30WbE07ZSCsy_c1y7DiiJHysYNgPirGPzBx.bfPh8DzMzdn.Pdmj4jun_Cs2MtP457wBlzufSa2hKgxn_YrA_cPsKiNHZ9vF88amI6BSEgy86bJ9VhKwXAXX4MSjydKlgiEQRm97lY1c_tnDnJSbq.dflDpQu0d2CookKiKU89MUKMv95u9A17C3ny_8Qujki65oeVJV44dKkNuZWIWB9h3fKqmMQ4nzWVr2OLtrp32NxZxoDWkx0C7IdX8THzKI5bCXTIuP7DvQklPNIDmrzJjb5LgwCxAa.wP6rp3_8nwOkYc45PGH0YC931KeQI4GfB_kd6wTLpcmrv2kzkM2MQbu20d7bHS3x9h2.huczkPYjvDXM40wjYazkGeEf_5tEvzDWpZPg_fmTs.WSfkz_hdlrNeLvPIBqRB.zrgw8nhSH_EqsevRrYGUrtKKbFWB4qnR26LD4SuTdO7xNTbUeads4hMSF1upqSU_lvcF.ARMHwDj6bDnw3sCKlD4yyewvzPjsKw5VqmfohEJrnOQFrQlToC7Yr.Hp4Ekv7H755I5iJRc93poxneYjc08pGGLK7_ddG4402zQpCdm2ywe5V94z9QUYI0ULbQi.NEvJ0P9SWzx1pYqJqJnrTFAt_zP82sNnLB7rHCVOzywg8NWHJfj2Zmxq1YjmlZxf3WLgB_xmZ90UJLtDncer5.3iALn9UDqvYLRKr7h2KbVlNC2E59BBDR_DEiNLc030R1V_1W1XZYQfC9zoZFiprZhIpYeZ_wzjEfR5I8ZoVycSbM5cDwpGmRktFJYTWiwCGJwCtWM5PmMmt5daKEqc9sHgRVQnCd4sIk6fU2EnnpSjpxRJj7rBsgi4EkKHtvlKoE7PlIq7fS5tVVfQFmWUfH79oGAtaqI8Ko9dikuHZ4HvexynK7dNZE7kBiNZ3j1DzxSHAl1XNHEAeCgdH_LLyHHRlQbFGlaxsrv2IOS2wBDtmC271tFe7iP1lLLu8OHpsZmkJEzNUyIaoBrpkiuqaz1g1ywSaTTubSK.qtveR7xyHAsesFK7YQvyPxdxYifDmyXL4IRtkR8zCsJ2HtZpDlImbKrGoBYRotsE7aX.ZG9.p6pxLnredWF_V72ja4OQDE29jIqkrQJcwHj3rR6iWolIuP9y0Qs831tks5RMLqVy4jEISPCTehCMkYmFs5TfHHzpvFteFPj5yZbAbF1AUpJ6r6noBKIjrh_qN9gjaooFWEb.zoA1hyZZ3SGcp_Sd0XVMg3yt.I_YWs6tpYBLhPXipKoP9J9F63TJDA9s5IlAVaPgGj9rBN35bjvGIaZ5PrX4E58wOducm_SYX_NK._YV2XPyCTP9muHqil53sFLZITflh.1iSwncx.w6XBtrfUx3boKdOKluz7jse4bgIPN_B3bbF_XHUCgJy55ZZYFwTDmZk7dOCoTIu0QSrahM4ucomxBvE3t46KUN5PrPIP_.y7_c6dspmn6d1dyt_oaKJFX_lbbDfrfbbst07ba0B4qg4G4oynnt2fV5OCz1AmbyjKD8diX1uQrosl68tXvHNbFYenpmvirXY.2WEComVYPX6kSLTvd.iarMu_zg4lsMBStCoLqykEhnMCizCFO7hV1h8Fo__pkZ3r.cuS0ayIgo2vu9ciDqgsMcLtqlZ_cVCGGLyWAiAwlu2Q8Jh_h7IbFM7Vmu69iOOL9IF9F0cXRuc72g',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=99af9b2f286d318a';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\/107937337227?__cf_chl_rt_tk=srxDkVRsw8MdlQUeecfCIGeEuHb36z3YHb0SZ2iUMlI-1762547612-1.0.1.1-2iQnmRKhghje.cSDX90YtY.1d_IzPDR08HlweDWWxtw"+ window._cf_chl_opt.cOgUHash);a.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(a);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda