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-7251048963-gov.caltech-edu.pp.ua/post/561850016709

  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-7251048963-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '910df6993d2b3b80',cH: 'zeUfNtje7NMtVBfrshSb4yHsoXPdEv6.5cdfawkqszw-1739377826-1.2.1.1-NgrOu8Gb13P5qr0oNHTuiwcyXmRmhLye8oxxE7cl9FZlLxZX_GVSntZvAQE.oZhO',cUPMDTk: "\/post\/561850016709?__cf_chl_tk=QNxu41KjfEkKSyyZ9AXRNVeMuugmtZKMHwzatq.JQAo-1739377826-1.0.1.1-TR0S3auGyRUrBVwRB6WF2Ppg35IwV5wMA3U5.MZpQOo",cFPWv: 'b',cITimeS: '1739377826',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/561850016709?__cf_chl_f_tk=QNxu41KjfEkKSyyZ9AXRNVeMuugmtZKMHwzatq.JQAo-1739377826-1.0.1.1-TR0S3auGyRUrBVwRB6WF2Ppg35IwV5wMA3U5.MZpQOo",md: "7jZLNtPKWi73i0OybOthJV0szO1ZzgLbXNjEhvYSLUA-1739377826-1.2.1.1-Dix8VO4v394L6F8HsMjrgd6111dOzvqwaZrAuZgYVb9xHhpHXAXAt9IgfjMnfp0aKL_kxefRD_EzW.jvxDGda_Z8YWJLePNISVa7a.7ZSpPlkXePEAKvVbUY3VCZBKcBCKPuOIWjr6lxV7.y1lOzfG9oldLiqZwIwwQsokACra6CC1l8yyyilUtZ_qHiP8IcD66137TIwtcAPWfalQsmNTYSn3SFLx3PSdl7swQKzuZGxJgJyS8XzmQRTvON5qzhjQn7lbV44dOr34SduXe7EBi794la56aTw6gQLi_tx8M_sc4LGAV0axbDjAMQ6JxO7ehqN5OSXDPDOTDciR8scOTtvQt8FMIzrToCOfwSwAS_iBBhy_1kqXBkeWTv1uLgoYptgI7DKYHaOYZzDFQ88I.pBl1jYMaRWgja9quPIV_5Iveo3lc4Tne3hwcb0rCts77TdacV_9EAnld2dxQ0d7CqekMr.nbIcHk7SJsy6b.K_U4X2lwBdWOHzP65eiCbxtyG5nCQzfYSzUTYecNsoUjldhRMjDFEk5MnFSJGCD6C.xIk_qFZXjrNhXCRi75Pwwy9890md8tJ37dTg7S9CzX2bGrk96kcOBbUQhmfAEKCW0PT3X4FP8PTtLICdn9g_E05_X5vUWepwybANicihNEcGcaPbShhLXjeHAv0oBQrPYm.s9fTj8bTyhGozlhY3.t_3kW591lfQB5hSzmPSE2W9OKvp.ixhdMjW0_6OyWxnyM3nauD2r_HWWbhHIF8NlbQOK1ZQt57c0fKqZMpLVMaaWep4T9priQePMIAEBMIpzEyEU6snY1BcA9Ol0tGDx8stqfxdiSrLjBBEe5v6PmtlzlSjFGtNQB1seyAjThSdSb6.RTbJBVg_nr_piIsg0XMDk1iuDqT1ZCAhNhpErr_ORQ6LSYhsCjGhv.UPnsCP.RqzYqD5IKwHlzoi1R4lMUf2SdRww2Bnwb8F99PgEaQeD0mKh2fS2ZxB3H2LGAnMmvDFpCQoGTgKwazBTZBJYW7ViU9eyyeaXD0UbR84.QAEH1Ik8mvs6VbO_KcRIS_yTCQ6UJJBUvKA0ndT2n8geytK.M7vCl0M1G3.CaKNtQbwc5UE3uvmnaND7kHtBTvBwxMs2BQJkbB1o5dEcq72n3kC4sEEEpd_wpxR0yMCBp0Rym8kXmc.K1bX9ZAWIyIE2DySIP5rrRXi4Up.e7leSBT.swXFLLj39j5Y7KuPVCVF9RYZOa7LXH50nKPpjA2dRoSyPjw8kr1gIW2sTnBR_UgEziR1awHJmOtarKADwxySyCdeJbh0qL0B0s8997OIxmr42yhtfPwGEU03D7JxH9Q6sF9VUIMWVHMu_jVY_lpS_hxHNITVZ6D.RIzqxxLwvcz6V1o6YNwRMOYvJ8FrRV4KWzfjKTnaa.qyebTfwYbudiAjMsY6NrWUDdN55far.Vo7zR4Wdz6X4pOzEDgyp.TVg2tk54pVX8A9gCIlRJ2rGRvlg_lszF0MTQlAJNOTZjWWXPYGIj09CtYfa24bXKdVdI1KTQXSFI186vhkc8ekoqF2.z4p1uubuizbb4LtrCzg6P4ADepn.d3fWBf.Ks8AGToDigJhLhWqmxd.wmDGeg6UMZRrZam07bEGnOTU83Gj88Ha7rSOThmEpvUxsdiqJqAFzlhNAbrel2Bl9KmGx8qxoODpwF7fSwqKTvGSsVx8FCrFAosMvJDQ2Xv1xxr9HkdkhQfHDPuvtJ1DBzsujG4EhU2eEu0g959IQFwlZSDglI9Q0MxMYTcmENmQO72gz.FLzpgBF3hiyV2uetQgYCOU_071383GT_ymeX2r.kZi4MNSyE_sP.hYbqdSgSqZaFZ86hNGBJ6rBPK9Qv35Iac6AaZvi73czxU3RJ6zg0cd_uya6N2gy6JdsUMCn1DMrNpEBA9M2aWbodUTkZM1DG3VonwK0DpRTUQkJS.qja4r6pnRHr6DiAkDmO_C5vU3nMU__PIy4T3u3zeBPklXBW26Fbd0RubuspcpBWWXimPhKnbMRmk_6aNqbQfzhEhKG7_2F7Oxqm5mNJFYInzRbD6Uwxyi4q85Nsajse5Pu3SqNd_DaODkMfE5oYoVi_81u2udXKlRJI8qI48chwvdLro8CRkYl1NgX0VoEDOVG63BZP4VjUqzTjnIgHJl76QXQxeA75k2eU.zS_8wZfNeU8XTCmQWhqPXUO5ohEsWHjHTVeIbE_bGyUd7dIk_9IiTnAJB5yJDhnQ7ZebNg",mdrd: "bVwNzPe_AoE6PNxB4rxc6D2px8tmu_iR7JZDz99AhZw-1739377826-1.2.1.1-Cqq_ovXZ1W7s9PTr3.VBBof8RO9yHP8hetJG4XIi4cvZc.SghG29ArW1jf.qRCxG1usC6lqnKNBJuWAwf3M2ApEj9NhMhuW690qdehhBv8lAuTK0vgdgJ15TS.IsDOr4lsc2hCQn7DmrhWKCjO42_xUNLoORBrTPUIV_NOGx5MJUvlEkDvpRmNf2R5r14e8GVJzfAMg7R6RiN_htvVn6ZG9E6rCAaW7UPBZQVAZAimb48tRsJPQMWpxqG27qguNGvmEhW4xfLiOSoubT1779eYQfqjfz1aH9.RcIPZfIOUx12FMA45ovjZgqEmQwKVhOyAGEx4fmLu8qmpZRoJ85RMYhquI0bzKJCFTzcRAyb4nkJj7VnSwJ6Nr6VkusSMRrNKUInOMK3PuH61cgaKPx7.wAe_TcqOdMBFQgHgBPU1PNfmFN1CQoOhweV5MIrm93mrfTj6iDDGfsMCnkysTnyva2iXr2bPnneCk5IticQp_E5F0rPNvutTo0UGR_QeQ5VCxv3gy7xMIYT5QmnFzcdHVkdHbU2r.trN46Z5YwEc2D05dmVZApKzdDaFqEDMauCgm8aT0Cdt7v7OyFZ2vdHzKekUZ7xos6mm80t2_DsUj_HXhfkLFbo5suKNQFCOl2VtXM_5b_EO4bOh76H97BNguz1VqPIFUyBghif25ELbvkCNwgtOawPAfWFLU9D56eAtTr3cveGbdgNnLz8CJ8sSMuUyqfVSP70_t5O2y0rb1q9JBYNS5rJqwDwOq972hiMUPL0CjO7bdr_Wt9WeC53XtojmdAaqgfM4D8yt7XfPm6vyUohi0a0HshWrEQGyal6nV9R0fvyZMBBQanPzeu3m6hIH6NX_MkDZA4aABhwXKjwV5X_W.bF4diuDLWBJgLCIRx307apqiqBUE4xElAGibLXUsbi5nosPzyLZnDa.ry5TQoQv__WlWMg93Sm_awZWeM4kXWpopX.yWWh1RNjPeZ7DnM7CEfvuDxHs6bXsbrJ.Zp1yZaRPw1i16sNAKAOIVCT2PBftWYLIXtvZ4wm2iruCyAQtb.Rck7KhTeJuy6AjJOF0rAz1_IfL3yH3Nr8ZEqsDAHAph_pDZ23KnqhqyuUjhosJQt2a4gYt4Y8e93vVsugXift_6KTDGeLt2B9GJdMpWNdF.a3k58Uyt4fRNejcVLkCaqWmQcThcaD5D06Z6K3iVmd9CN4O8k3k_gW6wE57eq7iHYgZcNpvJ4Ci9RkhF5BVkAKw2T_2bSf8aJks_ICKtWbjZrjussT6c8tHDaxIePp8Ni_KJP.Ec71SvZz6UECWBuGajcUFSwZSm.EIVck59VDGc5WbiZEZaoIf2DmgwUxSBH9NVlq6r.avASDOriifuuiJDZy2EhoeFQqVfznYm1v2nVp1PXzZQms8.pNbFdJ1C6dcXIfUPjAAc.rZmz1dDspUYr_6AMVcj.Fz6ZMRbvbVXa_rRYUhY9PV9JE69aVh7r4iI7i5cd9ibMS6ivyy1LOHiefiWrtqHwjRICdAD7abV3BHlkTedqmZ5Npxj_vP_JK5fTswp7NDybr2IKwoVDR.N.ZQyzkhjiO0majf3EfmIwqlYF4iygsGjmC_JG0pJ5_uTqYTqrL7ZVWLbw8c0erK1R86eRtIDAtqB.YyyfCU.uPFxOY11zpAxSaD1bUisMD7vILoP8QSG2qO6ZeeaQkLLNYBGrNKeTjFO2fBR3.XBn0w3Isk9ggmEAfeYBmc3QsjZTM8xmHxUQsHPhPAV2IvVgfM3S0RDmsEw1LuFyy90EsXDvMezFV2F7fG_IdEMAdlBtHmjeJIgA9_oSsoetlLPB5fWbD4VmujQuv0kgzjJR.V2weiXK"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=910df6993d2b3b80';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\/561850016709?__cf_chl_rt_tk=QNxu41KjfEkKSyyZ9AXRNVeMuugmtZKMHwzatq.JQAo-1739377826-1.0.1.1-TR0S3auGyRUrBVwRB6WF2Ppg35IwV5wMA3U5.MZpQOo" + 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