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-3156082947-gov.caltech-edu.pp.ua/post/056669985423

  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-3156082947-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd9f399eb807a0',cH: 'adZoz0XTWzy.bHFvqptA8..YhCgAvzFpRZWVPJedUYE-1739206475-1.2.1.1-IqAqW7bB2qfMrAsUBfusb4R5aJ32F_WWqeTgoFeRrDmyTCluiI9LO5TkYYFWYImi',cUPMDTk: "\/post\/056669985423?__cf_chl_tk=d67WSGeexvwupxrpI3VDlKsgo.ro2Z232EiU0REuk5o-1739206475-1.0.1.1-PKroOoeT.tpLMyI2xrGS2T6IJxQQF07nPwu77XWuRnA",cFPWv: 'g',cITimeS: '1739206475',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/056669985423?__cf_chl_f_tk=d67WSGeexvwupxrpI3VDlKsgo.ro2Z232EiU0REuk5o-1739206475-1.0.1.1-PKroOoeT.tpLMyI2xrGS2T6IJxQQF07nPwu77XWuRnA",md: "vNlf4EIp7Bb6Uhl9mIFl8rMbVrbwFvwncd2_q0W1lkY-1739206475-1.2.1.1-hpxXvMVcIWiJ.rfo_zwgKjSnY6bE.dK8.IhsGDl_4ui2fdszyq5m.vPR5VCPsc.lYuzN03FEFndp2fk98QR6dgOnpm4v4oO37LIO4NnID0mEfgIDmWE67CAdYMnGY1r2ZTuRMDnnTyDa8FkLFchkKLIFDYQTnyVgJXIiF01.vPyWA3S.JjeLjbee6ZhEegnIaHCaW3RUlr6wHDpWEJo_063wGjp7vtwAe3mlnQZfHU7_PFq_hLE0J9ixfZQQILXZu7dLRV46JDx2oI8IyOyDwKOJUtyNZjzO3RQYF6z93RIgMQ_CbaDvjerZ1BUkIP.w51B13bL.L9ho_5icaRUQugetYbw2exOldDlOc2ZcFhvQuuQuTDgask.y10co8S_0GoqycJgJO.lFYvcUvyB01HUk7tsmHlGm6KTPEfofJD63T6udBug2mV0G.zGpYSdZO53pdFyjo9auod1mOWlHOuzPPquoi_TDHoZJqWsaGrFbMrJB14hW3wXfGq7XvsooJ.PmH3qjgBoFamazPJFrHkbNDJMpHK_XmeA2cqDKVOj_AXlQieZZUz5JgAMczy6ldDpAvsyyTumr8sTuD8BJNUg9FzPXBSvtRSOBqqk2.slOyfggfxxIsr.BNID4p4i8tA5jq.LANlcyiCn1bUo7e0C.UQ9JlQRjlUrXYq1W8.edevegRL4JFyNIxeF5htNL1.PAZAoXcWvdRdFfLLmInHjBrh0GWY_nQcq_QrDFlzTKqdk0S1f.7gYEUUBAjglfg9b.G7SnPinL7iEuLEdCnPrQWikAi23RntI2wMTKCHosEvw5d.2WY.1Tz17TXz6xBjvlsrXZMYOsDUEekERc_TpCabPJrfZio4Zqen1mNRTYBaJME8XuUj_eF4uwlZ4_dXLhL.9UG3zSckNxJ6zaKdqvNFc5JcHKOCt7TxkYQ4GaYccWRD8f1df9lMPikr7MD4_PvwI3jj11Uomqd1C2vvYS7vb.QLPeOILNWcIAJtTjfY1yxgdDvIbG3AGsvFU06ye5fNyZEyqaLPI3rjrm0hT4XKNduZkuWvVwbuSDgqQFxhmbOjKaDTUKdzct2qHs9kTjPzA_VvQ7_bIVH349mG2uuXSDqBmh9HT7Qx3ibaM3bcNAR3SM20qc5RvNT.CrvI4pJC3vapCm1t4fp_vDiLu67TxaUvq4q3P6VQ56HTWKiXfo1vbMYfKFRj8cev5.u5gn0LROBFgJ1l00ZkCOashJem1hPnempRfTepMNLkcxjsrRGhVnLwzD9UPztKphjXjBtoIpsFYsLjWzxDGZ.zgeL_f_itqMyPL8vaIFm_7aosYAKOnhYbAiby6xj0D.Xh_T23efqVkaDmetV7VtoFEEPV_cXmg9DlQwLYnQdT45AJBcKzoRW1c7F5_MeH2uK828rAWPGjkban3bodtkDX1XbQ6VrMNq3AqnsDHTT5QuqFEKY7LFyqwGZ9TNh0yLx5_e6LQPW3EYiP9MC0ETi8oz43lypWFRSUtvz4mq09tClJ0g9E.ZnB1n6J9sB2S02KEJuLNTISAj6gpkEpRHB59cisEZQoLR_N5NF50YmJgbomn6RbpN6rf2JRe4W6VvpB9nbUDKiXR5qtQmANj_jgVbgjnrC34xO.nybFXzdJwgpzTYoSdLsMPlxKRetRnWOctIm5pgoP6z7ilXAD7GNJmhKcP.sTwZQIdIuSsBJO_GhcLkflW.iGCS40VxkRHShziRgbYnegKPm72MfNEnVZ23YdxpqNOtlYZSp5SjMU0G1RDzg72o1QJPN5vwuk1dRsw9Mlg28nDt5wnfJ.zMWbpeVryOY_L3P.oe7oT90YVRIgr_oiBpBeFMoUcbQcyumIR5XkrDpr_IgJoGCTCtKw51BsvFUCVTOhAF_rXp5S1zoxV9CyTlKzT0.Phtxnf60P26teVCSd_OcAE9SiPT.5kPQwrWdYantDRx5HpqPzBQHi0Q1VqxmxmGQFrAYwI6JXiwpmMdUtLnIo_izMA3JI4BWugVhVfk4mWXEhsELQ29oLYD.WxfiAB0RHDQpYvyhdxjsBjiolL1tR1wBSXbJb5mndEhlgH7eYZd0YYlZIJh.RDZrlQM0Ho9NZiQ.VSIbm_1EzczppV7TOoyFMfr2aFyeEfH1upWiHQO1EVHXY4P5I16dAAzYvFJ4b_PHBKzf8hF497TyiJT8cOwY65cnH4qGCYXeVHU4FFNXnp2oerLIccC11H9A9dHB8V0E5SLgR8fqbWPgMTRs7WV8JHvBw",mdrd: "8AcZvZJFRod9i4ZvSU6LTH_75uDcfJnf.QEiL89in1w-1739206475-1.2.1.1-elI9E9D2gWdijJI7v_0aNMDGrPHk6SKD2.9kzTNsdxz0DhJkmcz6oi6q60jm9KydyfEjQH4sKv3a_ntEsObHsePySKsiaIFKgs_zpE4W.k0kVi_NXa8G3LgwkbpWdLpDsFlIppWlNM7an5apF.SM2gqe6xxOZYWKciGSZldwT60TcfEv7wgYEk9WicFJJr_nqU6V1HoyZPQeM8MlLM_u_x0c5CvqW_RyqLQ.KQlNQlF1x7OvjYzEmldJjQivnIOQl8SjizlXoyU8.Pxh0Xb7Horbfdftsj7N2Hucf4nCMMO_USN_TCYmLIbCe7w8q3uRLLCS0vlgI29G0TWbszlf4uhJwek0C_ZIYeRN.29LfQynYbLKVmKYRHwMxqYpQYGj4hEbCKyjRUP7pd17HRgQ9lfL7mz856RXOy68.n4IJKTX9jaCYTc7kEwHIduWxnKAc4dDQe401o9w1B_UIzPAOXvlRs_Pmh8vJKiF_d1u0sNg0XR9t8hupcrH3ISxckjIhvDUX8jOzV8lU802vSDRr0JJd.hkpTdu.Kt2VVX44.akemdSp0fw1y_6mxHztgB9qdzBVXsfidIl6S0ZHi73z9ou30.62XsyhH_mUzmSemmXoc3erxx_9iVTa44p3vzdOvLVLC9S2MbysUkU08Ahy8KPd_BFZVWuJgD1DjDeymLmdb_1D2sUrrAjU82jhTqcvlPaW7Fd6Ve82fhCzqrRYSFGiWP.epc78Ax1Ne__IMfE8FJwuyeFMgO7tv97p1BKes.M6NKTKdHxT0wptVUQKRz8rSmI0oVhekjWSlV1py76DpHLsu8fti5uZRf2FMMHSq5nEyztq6vxMnmgoveQRrLNfV2h7clSNuWpL2tZ1LlpAn_WLToajV_er0spwarZ_khaAkfxaFoj.z0QsAEcv1tnyEyEwAZvu8gbF3.R0vqSaapbqIS_m71r9eRtWJ4bxd9QL_EX1c14CvxDz3cCPLq19t3UGluz8ORE_G4vTHlJrd.CwOoD6sAoSe2yr56oOKOCQk0vZcCWKrNOsNkXDnthyBc21cBCvEZuKQvE_3nrmy3qgAD8_rW2XZ6AyI2VqE9DBUL0iW.CLnJcasA.Cw45gY6ngZ2Kb8K1dA1h2chFAKJBp9keHFzuXzP41.G5SKAs8WdA3jdC0GHWjIXcDly_jxF3FMcvbniXpl658So7LWEkCUTNvw44vYsc08Ro5Bkq.gQFudPH4YZjUU1AaL6I50CcTBoZ0QpYQzK24Xy3zihSVyEVr2YgHfBCAn_4EO1my14Q4wy3PIFxOtXwAA4JSXa3HO8X9dPFMF_VZILPTEo5C.WSE7jrX7KS6nnlaPIrJpuVJabMOP6V7I1Ov1VYLaFVU_xAnrx95vyIKDjxvb8TnWauhW7FxYvdere9Rvdhk2j2JpRJonusjuvC7EtXVbKpsWcqwge2b2mn70cxfcEkrjLHY2zu53q6hA0HIq1JIrTZvmHxzYUyVvVkIqoWj1M8ywiE5w0c8_j8yjwtf73Fo2.2G5P2AwbU.4WrQWPZ7aNVLkAy9FnopZHZ7YF2kWTdn.OsK0bYIXiZVVLr9nn0MbSXyqSS4JAVstm1upPayJC9DtBeqsejZCIcggEoxNGlk.UdY6UJQ92XjCB7WkNojExiS28_gA.ruWgpSv5PTt_pvl1leOycImjDtDJL7iTIB.fJcTTOpDzJ8WuseBNZQ9sypXyOsff2x_M1sJVkzu6tQCTTAFluxScsse1vX9zo4pt7Uwa9eKRBDfxSj7gDuj_jVZIfNZfuk6ou6gnm1CsYEhNAsiKh_sRne54vaW20k4xdIS17COBB1IY"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd9f399eb807a0';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\/056669985423?__cf_chl_rt_tk=d67WSGeexvwupxrpI3VDlKsgo.ro2Z232EiU0REuk5o-1739206475-1.0.1.1-PKroOoeT.tpLMyI2xrGS2T6IJxQQF07nPwu77XWuRnA" + 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