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-3210768459-gov.columbia-edu.pp.ua/post/3210768459

  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-3210768459-gov.columbia-edu.pp.ua',cType: 'managed',cRay: '99b11a326c53f24a',cH: '0_ynf7Y33BnVcmT5rd0yurBdhmWcWruaybV3MnXzIiU-1762563300-1.2.1.1-XIvVb_BmHw2bS0j7zC7Z_meD.joxJDqyOOzu86fKIQFIA8LF9nIRtrM0FVtjvpTS',cUPMDTk:"\/post\/3210768459?__cf_chl_tk=tL.pboFYb6THqwo3zW7NG4HzRchT49PsNA5S7kkZYxQ-1762563300-1.0.1.1-Gx5I2o5IjWrH1mmd_Hl91qJ7UKx_CO9I3dxNvgNwr1s",cFPWv: 'g',cITimeS: '1762563300',cTplC:0,cTplV:5,cTplB: '0',fa:"\/post\/3210768459?__cf_chl_f_tk=tL.pboFYb6THqwo3zW7NG4HzRchT49PsNA5S7kkZYxQ-1762563300-1.0.1.1-Gx5I2o5IjWrH1mmd_Hl91qJ7UKx_CO9I3dxNvgNwr1s",md: 'uXs3GJueF6LdD1tJwa0mVrmZ8u1sbyPOSXJWtGQL_Jg-1762563300-1.2.1.1-J9oDGS8Xm_Q.bj7K0h5vGCfpLaTbf2kltH6SmrmhXdP42kulsk.O7T2r0UFX3zkHErxnImdMxJI6vopBmg7UHMkwfIzilnIz_GX0wJRwGnm0nrNtr0T78RxWvXUQ7sRE9PjLm5P._CkhOPohcxabdnahGzOvPY31xzWz5hiGpgLx4NgUuQNuM7mLZ1.XKTNP3jW7Ec_hFH9Wm8B9Z7B20nHQS39oSsafKEqTbRaSGjwC0Wp_VWt46fGHeobdmiRU_vyXD830CVwzuX6GXiVVLnoH5xhJr22NhnEwu5skqlw042AApbUrklpRilTZcwPFW_O8sPzd2oqf7j8xB78u3KPCunaoCbwbZTy56K.OhBKuBD3VuskV5i2Ktg6.TjT1T0yHVNijM1.kxBoFu5BJPkhGuEhAaC6loyALJOfoTa6And9VGuu3vU7MykQaiTpLFEtE.ZxSA2hOxKNIn2rHEwJskH26gqZ5KxzGkNBTiogyTUEtj1z8X1fxgNnjCcmGhfM6mhqR8GWO_Ur2s2ctYMfej2EDcfSSOMQW7rARvM9BkhfkIwOcIkGbElix6SxlvjhlQTsMHauaZTo6yrorXXjDG34YkfGX2Iqaz2n_gQuKEjtKjjGKQivSwVhpUXhgIG80xLDvdsCdP8YKFuj4KZsfIjKnlnRHdUQ79TxwC9rNpADYizh6NTQl9VT5wkAloIVTxFk1G50vdfeCe6PY6MlqUyb0Ywvp3NaQiAL6kYnL4CyqH9qGgdEAtNtY9HWcX9HOkwZ_uZfIRoIjWjVqT3tMajVHbKiXBJa7kGAWoQxo.Cb9pZRmSjwv_kxO3AV18y7AWnEw26OUmIoI5nym8UNrX9nGzy25i.n_7ZP.Tz8',mdrd: 'eKauCC91lZTrK1t4fY45ciPzIuKg_XflC68o.J8SyaE-1762563300-1.2.1.1-57AZzKzkOK47WMtjeQlnP570Sm4noqNOCQXmPjSFb4RuEJN.enVzFNa6Fe1ea8DGMvuMn7cmQP1OX6AJ3zo8fHcxo6VukbPjITdFbDGLf24PYnSWp22Ca6myTOPPZ5Lkw3.Z1K8wc4zo0lGCQTAu9An0A0FmM6wwfOb48rHffYrKLdOdeMiuQN0kRs_Mm1Q8LV5geqo.Yt3sVvZ_qwp49nv4IsCqPmU_mhXHhg4m3G7zeXjCQL6GWM2KnXtUYc5j.yLBXZ4IivJwQdhzICBvd0WAAk7dYEbcTN7c2Qp9C3Q4K7PAzhNxACzwcSY9XAwBNlTNqqgc8jNGk4I03fOCXT.fdiOsLiAIdKyKE0pvEX2F4V7uwK_5V_IGWtag8vUFuNTeeRKV1PNilqcNDTNlwGnTQDcN8PtQG55LbE_7Zq2R9Mpvgw_qwRfv97MuNgdOoytiA5jvnHn7G3RvCvbcrX6xU3h7_WkDFWiYvWWk.msBCUI.BI9GKS8xP5Z1tsM1tVmpuXHwPgXQXIFXutaO3AHUMRmqjIC8deTkSoM2eOBOa_DO7YTZCZMGPQRLpYxgHX7cfrsyYI_L.uPOiA6E40RevG3uAC1YvKloM4xDxQ0teNoE6Y4v39CS.HWgeR3oA4lWd_ki8M9AgACJmBU4Z7T.LW8ShGriTt2uBgwXS9e3TrvV04KAROReut.uZyhk.HtZb9DmFb0q5oF3Kf8naRHUHUkTmqRa8q59QL9KMMk3.Ss1ZJrB7WtsihMnrYNkn2Vr8G4JhDzVvAMphPTHvigAjOy49Ms_BBVfGRtCsDu5MNxyUkuNaaqxlwTMbMvXHJFJQwNrgGlbRwZMK0d3ErDFV7ipmUHQhiFqQxmmi9T7ObSy0_gVTcpPgO069igR_d6yKUhiiN5ELYJb._sNC3emZ8E0CwDpLdEUdlzY04Ep2HtrsDjbF0Qxrjo7BeKw3pfi6pYng74.tv98.3nuTN04hW2N1c.puoAf0Vysy.b36_QnARfJaiImcinY1VREbO7tNT87uZagGvOibs3qhU5Z9QZYIld2KAJ.NO1e5Sf9av7eKG_jl7GBHTsnfIBU2mHVDfUgCCt7rCmsd0MTuFLVWR.UY7EgiznyHyak1v5nOHo7QNJ57WEqLawxqObyPJdHVXhT6TEckZBI37sfWTHXqYETAfkt8qZNQJUjL4YOVQDZNKjPtrWz0omn3hI1cfrWxgdvCchiV056rl_Hr.mZA3GieR1meMjbFEjLf2QznYufl7XmxA8sa09qObpJb86IWd16JP0wHVCV_MvygK4KmMiadH4VWBwCmBuD8TZLNf1VVujMX.zn1rIBl5bhTlZGHDIxhnnTqYK2xmNM.ypANlUG9DOVF6wg1UXDptHwL9J6ZZ.2m4yLpp2w92HM4VfEOowQu0pnAbaTzb7e1Yjmq.bUXPNfdq_y8vEOUJwqgf99NNS564b2Ie9IHXx0euKdbZ6YYrlvrsWS6PaSwrX.W4OJomDpQR.Ew9HzcMLLFdVC18X6MrUHuUnaK7zLm9fNnXBASlWGugsZRQ93z.ar7VC9EkTkOde9e9UTIWBcesir1atwQ5b3t5xroX_R6dChfjVMS_7OgjvhCsOmhg5W9yXXAP1x8TKkWUwYJnUSgXpIupMmhne_aBO6PBl4HDYf6T.0cETYyladWYWDnPwbOjld98oU3dG8FIPOtMY.a7miYDUnCraDDkvhWelNO64I.rpjKmQjNBUMg54nhZtC76Xiu4P8jN4uxFnKwD5K5KP.ohp.4Fz5tfdvYTZE5J5ejhylMb4s0yYN5_6AN680bFoFeAdeTLlYvspEJw8OST7X3BQLGASSNSMyxPZqKqNJp7QJ3NhATsNWNNIlKuITIF.X3knBTNRPLdarAxm7ykqiHkCaLK7bDb.Kzs.Z5OY.5pAYIEDMZO0jxOgnWoyIGWXC3tOXLYmhrMgObLaUfSdfvC9i_JyopmheAJDEUPmLZ8zSUqpaLaMC9Uevx.IMJaCpzhzNZ.AigvgBWE255d4CQW_eiuTTjUwYSyck',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=99b11a326c53f24a';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\/3210768459?__cf_chl_rt_tk=tL.pboFYb6THqwo3zW7NG4HzRchT49PsNA5S7kkZYxQ-1762563300-1.0.1.1-Gx5I2o5IjWrH1mmd_Hl91qJ7UKx_CO9I3dxNvgNwr1s"+ 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