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-4793085162-gov.caltech-edu.pp.ua/post/4793085162

  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-4793085162-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fa326f7df82431',cH: 'yY461bcuN9BUccUfabY3zdxNjDNdcyI562H6Q1SJGdY-1739170562-1.2.1.1-b0_fxNzOr50MzRqHgjYAqwm0_ov_UJ7DhI8rX9c2474FKPeTR8VQrUWU98F6L26L',cUPMDTk: "\/post\/4793085162?__cf_chl_tk=OJF2usHL92h6CdJIY.SaR1IBlMeLkDgGn3d6AqaoxEo-1739170562-1.0.1.1-ivX2l6GqmALlGb_BzEm2TVLZeu22PB_40Tp1dkL8qPs",cFPWv: 'g',cITimeS: '1739170562',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4793085162?__cf_chl_f_tk=OJF2usHL92h6CdJIY.SaR1IBlMeLkDgGn3d6AqaoxEo-1739170562-1.0.1.1-ivX2l6GqmALlGb_BzEm2TVLZeu22PB_40Tp1dkL8qPs",md: "NB.0qOa2sGwVf1xWFl48DsH3WDk3TEdZQYFP6BYrOjQ-1739170562-1.2.1.1-kVEvAhFRi.MaXPXjxfTGNv0yqWsl0y84L3z8gCOrJLgdPgTQm2uM6TqjGmlc7V7TMTaqWb3nscN7D1t0yqC2n77rwFB22IfQTfcnEGxfCHrk0RPO7hq72ZxBDmISV7sj8Zx4vEGi8a_ZmLcku4y1DTkRPYvzLvgtgW293_YFC27Vlw7wrQS_k8B58SzZv5jQBKEYyXBSV5Y4RDabXRyWtfTAt5lsAPOfbN7jUroUk6rZBO4LGJdFiW0L8JDRYirPM.tSqLCYHQ8XDZr9dBfwcqDxZ8_t8x0NxoQB0iPfiYc7RywJmryGTmVosjDzTj0ETOayqQOtwx0d0RRbEyJYxhTFldcPGnfyC0d45g9jeQjVhJRj34Cla8grl2XtyDz8FC9SgYVRIjKK75qsLjnzue46J87PgxMep2Y9uqYVAsmCz.aCYiFnBxhViKfmVZU.XIHBcZ7dSzAKiQGnqsSAwRxf7yzkZil5agJUbhugoBVNdS5J9dakOtHxUFAfET9Q6NRBMePHnkZTYJQ0lQ2bIxnDdvm2aKyz4wavCB6mTGEtWOn8e_b2rU4iu3Tv067dagWbuIf0ZrdPJJvSDNdWrqbpSDFAjkBLspg5PnvOWrCT6.TJgPy50uNOdsfP77mVciVYHoMLcy.qUNnhfb8YuO4qUiGgUxNIvAr3QSjnLhesy25gkOBaYqfJGsH5PZfhlxzaPOrx2bv0n8VzWyYDZ20noU2WJCBN29GJ4DnfR3YP2KSJwdGeWBblhAIUZvdE3sVIKyeajj0WEKdqm2w0YUn6h0gC2w0xaVpkwd_SgQ7sD3adPauJslceDm3s4o3ZttgmfyFT.Iv.JCtwC1WsErtY.OVmziQy5.408_P7Np3j5D2yImkINLuMwnWQdsqt767gnC7ZSaXlk77aQcyt3yKdTaDoxOND0mgDvhb6NOlBm.t5ki6UAwdPkawY.HEaqhr9SHUbs4qOcRsyrg8GzuWS_tLBDBiVFZHYA_arKSYvsV6dEOlAXngrX_draZEhiAj3YdFSRLLpE9crb5bv1lClCRoITuJiePNBgMBMFMxB32xp5_ZjJFFfDlenOGDI2_llPiEpJcQtUGGvypYQ1cu8yO8bHjPKKrweBEG6rzgcQparskbof2HPvxB5HkC52ga6vQzLUoIGu5SYq.UeyZSvoa2ROtJwnsjqqlSB9SKToucmxw_BtNTN.I4SNoV09lP05RKA.B_p6QtEB9xLQUPXqa6dZz2yWcACJQXqPd4AOUf5g.Ck5bd5jcHWm2F2FWK6HEOCzWKy1uOP3hhFc7WyrGqyhLxxgmPmkmJdIczAVcI6_7y0DH2kg27NbC5idxpCa1pzNfwsW9Pn5FzpDgQ4q7XtKrfn4FmbXQuOKNQSuBuUO6TuGambSKiRritnUTbz2lwE5iZfDjq1z8B68HyLaeDmQjSRKaO2VzxxXUleubSr0uvBgbUZBnImTYs8jhRFrMNOahHF1YlS4Km8OHvUb8RhS0yfK1HA3mErfNPo.QcI_GrfLXFSriYapf.cNqm6hja86IRPzyFVX8wTTrBWXpXUTdUcwuZhzh43YgqQg9X7gULo50BgYvZZdFyTsQjMA4e2wCsjF.oUyv5HONy3DNIWr0Wd6kQbDahFSdLmm_fT1zCf4ct7XnuzPyNjKK9RVPliD87eIP_teb5nQ8_rb58cknxSz.fsn2dVeIDeOipWTcxrY0bWgCuvp2UemEaTdblC4ZXYebov4qjmTp5RXvKtFRYJKKFoyX0wuVJtNal6V5zFCr1xajHvhc4l1TcTxmXglINo3zuUfkJDdmJ3lTJO721I.OxyA3ZhF2eBBlUr_pQj3D8TKbO9fY8KPoqkBuvNul61b3nLUK7Y58Nm0ND7eCzepFalXKCgYwxQ04HI5ru519Ec0OcVWnt02QaSautCc1LbKtZzSY03t.witLyO9Tj1LZNYQsuON0.noTUKKyp9SuMGrG1ZK_NzIcwmkCoyEQblf21OIp.U.alrHMxpfEBCioFM0EN3fEvPhOS8knPmP6yHNNTKb7ZBYk2PRGCqk6mDKqn3_ljYx3XX9YP3mn46jBCLNb7db5MneoFvA5h_iHAmrKp.8uSXiqi7Jr..ppUDxDCloYTUCiOjCHMQENCuxEcJv4B1pa7Q0pPnxjnOlslFrlpoZaJ9JzvFUIuT_QzhMDo9tipzyypncVWCslcKV7tmO.YdnYajb02lCmGPC7RcR2KkNwEUd4VvG2RUZsnbCHNS0qoBzg",mdrd: "CwlGmo8ljL7l3cNWal_JJVfRxazwcGz520yRquqd2rI-1739170562-1.2.1.1-TAXveadROI6n04R0RJ6uJkOHoeCWh7zzTeMQXrZAH9xVzPfkXJMK4vGPf7yJI8v_2.jMgIvpGrsYeWljPIvZvWBLDXpFJjbbyo6DJpP.8TreRY.R.fYkm9AtvT20xhIwFat2wgzMSwoo0L4WejvruvVI.oDXEmNMVLxmOoNIdq_uw9RnuvWiOTyogpiXRNL4vQoxaWKKwu.QezXlocMguozh7F985DHhKHLfyNGNeNGTSz9sr7St4Gu4apBq0uWRESM8EerEDKzelLg6FkmDeQoWgE_yImK4BmEktz6cvov2M4kTI5g7z0m9fLzoiTq4Kdb1GBhs8bArUu2S3N_c4QAJMggFPptNrDdMoYpwL7B0olp1RETjn9t5oOuHUjtJYCvGZdIP_hOVaHg3ET5lMPcnVCsovRtGd03UC5_rLMsnV38RCKT6ylskw0w34YZ6B.QkGg3dWf9AjO4.eRdvBsd.oHPPamIjggtmqh2Ruj6nXEfcDB75FJ2TrprbEkJpRkD.IhoZ55.4OcOqU_TlVErsK63rReAA8a9QeireEAm7sddS5JA0rjKKLiTNVrxGkTJu3WfhzL2oaYDmkUq.n0D4ZSthuI40kEEiSd6ol6B6F1kJTDWXpIr8bis0gvR7MR0kyUOA9yakUca3gZMlsrH6OamaJnI56WsDtUAAXiHdDvS7hQGKmtkb8OSDU2.WcQymYsNoqJFxWUNmkKjjqyxFOrr8rsPKdXXFeD_.xOHg0JBLv4K7uM36Y03dmf1p47mRGM4I6Iz_CSkoM0dcbol7Sl.x_XqLO2DYtuSCBUWVtZ1Fi7GtoRA7m3VcZerFoRDwoX0o4RqOOEh9z4c6d3RMt7fjhtiA2KEgDGFOUZ0XgVHSpHAvwWAL9Lm.zii_SzwzI8NM5r7Yl4R1lcI6UyGp112gfZ5rrx9PsgYrGv_i8bbSOb1PwYG7ArOM02noi3UjRkqvjRNgVO59kdu1RF7pA9z5NjYVVeZqCkUai7f8pE_rcrQ0XpUFC3bdtummQVeoY6izCZhonrKoKSlPk4j76tBfMwH1ymPmWmKd7rHs1RzPrKjYLsWq81pnGPmhp_xsaOP1nMvclT1_eeDt6EACx2wztmvshPD2r1kxcLEaMx_KWhC3tFwpQ_sIxIgZw4U_rjXiCr8Ud0XJf3SINbftwja0jlOrOM3b98Lm0bMf05lJf_TN7.oWFp5KvzcOj3ax8H0Mr7z89XZK3Y7rqCIN6lNl.xQow58aXsxT1IePdHKrZQ7m9DP0tr6Ge8489azghstd06BwhkmQstxbnggw2wDf9zZ4shSNQmnDBVwXm_qwNs5xq12AtcPREWKGvR9E1tU7_wwmNJ2QY9zDFbmOoU4_iH1cqMlL5q1Wy9DYiAnkgppSQsb_vSzEznk1OWJkqblfvnQF3hqEJ.bC.8IsXnjq19PwXxvtfm6hXLe9Zvx4pIbGLAvxaPl7OBJN6Yshwi8kFNEV7c_B75DXEWmdAHstbUy.Npe40aJsj6iSyfH_fU6cX8P7BWIKkr8wL63WV3hcDdpMdgI5LHH7Tc8Eldu71fEP7TKhvPlTPMduwnakKVrwVU0ccg82y4fVii6rYNIjSqNcvgh5vRYMD1E0FS4PxJXpE0eC9zPplbGBu6sXci4ne1x.tVJKN72twM74FWclEfUYehZyDiJ4vRGRuhwi39AECSU0kv42m1mshAbNxNNHffPDDAb.8cPloKul9cckfd2zEuPIbmdNclQoIBzaQUT17vY2wAWchnvYI4CNM2M_Af5cj9md8.anS6Y6SZNQc4U.JGDvTqiJLwqudlwZH5O5cl0MWmX8IS8"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fa326f7df82431';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\/4793085162?__cf_chl_rt_tk=OJF2usHL92h6CdJIY.SaR1IBlMeLkDgGn3d6AqaoxEo-1739170562-1.0.1.1-ivX2l6GqmALlGb_BzEm2TVLZeu22PB_40Tp1dkL8qPs" + 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