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-4562873190-gov.caltech-edu.pp.ua/post/4562873190

  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-4562873190-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '91012b2a6b9bff12',cH: 'zBkrrtMS8tj6hNc4r.Dh1KKk7.gs2IqJGXKtXBNf9GU-1739243665-1.2.1.1-.xNyYIzlg.9TXhNoHEgyehLqJhU4b72Qlcv5AAhLBpUOSDXMosBG18XNLXQ5BQCq',cUPMDTk: "\/post\/4562873190?__cf_chl_tk=A2JypjC1rJmkfG1nfbpXruElLpfibWfGtux_RX.Uhg8-1739243665-1.0.1.1-iXuirPK5fcDs2l77d_caWZRGFWPmOAbjT3Fx72H1JNs",cFPWv: 'g',cITimeS: '1739243665',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4562873190?__cf_chl_f_tk=A2JypjC1rJmkfG1nfbpXruElLpfibWfGtux_RX.Uhg8-1739243665-1.0.1.1-iXuirPK5fcDs2l77d_caWZRGFWPmOAbjT3Fx72H1JNs",md: "8R4n48jIjFzRvOIzGiRViUHMk1Aq8EpWOzaZBxWhb3Q-1739243665-1.2.1.1-XzavLZzQBKcWcVSKhAvOP6ER7Gh.SnYi_I7axGsSMQZyV7zGRPnH3HrNev9WZ6OPbEFB1Vm1KOArKjnTMib3olkO30cm5ERHn0Q_2vpFZgat4UwQgVn6py3mBq3ZI92OQVGJuIcDIjVpecqiVRGaM6y0k_ojGBsUD6w9MAaAUucieTzhEQtCimV_seGO.EzlqYSR6MMCTBJDtWSL73.SSdUXHqDKaFd9Vtw4J_bWTTN00R1MzpoS6zzJ3nU1BmyfXO_TtosMJXo7lCwTMkIBhe7Ys8Xdl0aiHF_RXcXaL0C3ANmBnnggha7sVp_61nz1MuoBmFzdbcSi0_BQZ3SBmIJ9e5M.dzEjFq87suRLE9a0QwvoyMWyMA7WppBaQJDWigqS.KKwSJS767ala_uxsGKJfWrsO6H7wnDE.IQdIjn.tqCQ7ojrZcJWa2Gd6877Tq7NJ17OEwif9w0we3Jtiq1fmIubJokX_Nuf4ZFHKs6pte7H0ioF7r0rG3bMcP0XXOLQUq7RogvzATLuHjsm36wCcZ3bcboqs19HDsDQ.s1WX2P_cGeFJT7YL37JmnbsTMi5Op1ZAKqpyYqlHr_T8.Is8lH65VPWHNK2tumEjRC7W65TDCrmCLSm.8i4BmRv0tuXlELsGTi_qxcNuuOnekoMhYuEOJnsXifBvoIlDbjDT1ks0CZ9dxk5JtIXbx5spV.dNwzUoST7FetfV7AzPYlwmG4tr5nNTjDHAcu0hI8CwuA8P7vo7kHHwY1rW2PVi4ohOAKp1qrJns0w96Z_gs3VRdkW1u.Pl_D60LGfo_z_sT.Vea11CQpTuqUAwfsk5cq4lPzvnRIMpJVY4iIxvW2q1nydI45z.a_c_joVPiLDkZHNvXWzj3EgbtiKwQngiTZj3OznuL6BdEQcnZBWhspVfVis6ZQAH30dVilvownzy0ZsOgAyMS.aEMCJscDJpJutlgpyMX9_tY9dIG0bPpsSKA9w1lbX7fkOPIq4Qbh.UIxFKid4v8oLj7fXaijr1juxNxf5YZf4FTrOgRKBU8Shpu0.IB_4G2zn5e018AJoW2433InBejjQtOldYgEcknJl22CfU_jxXCLLqQbArvdOV6NasCXNXxfP26tbHGGgTZxInO0enRnIOJInSHYCgb.DN66oSUMfIPgkIo0w.K0uCct2eQpHdW_Y4QLIssf78k.Ey6sSzDxEn9djU17__Uipd_J66OBrrbJMBxwFm6YdEbbAGT9FuN940e71JV9Ew5hCFzz9Y7yeffNMlYrbojOHF0CJ1FOndjD9044ehD7i87JfgTQbvL2I0vaJ5pI9h1D8HplPD.O1.ji.Izltq1_.1yBqAT5p4vu_Xm9KTxV0fUTYPBR30SyC6OaHGFnGUMXoVtD8_qnHtwokqeuUITIvgmdJQ4jobuU.suDsMaJiyuhNhHfA._tTEIW_pRitqzwWwSmlgmh3H2gltOrsLLsmcMkKcLiiWUD7NASG7QFazDb5CGqWtJREOOLv7JUKPu30jF50aT9qeA5Q0JC9SAJNPxInfTABjgTd4tLXDd2kGMhDqa1ar.rUbh45i1jHQ408ATEgmWBQAO_bf5h3zp0xPOWFtFe4AW2Y8.l68aU4kMcVriKwQLqfmHYPPsRbLjnobAo2fUzVaV1CykKHrXnK2phbj8H30KDfzAorvzlqVFqtqu2mWhBIhM.dWf7y_3kPJH5qpF7tuEYNQZTt2Qi.q0UDd6xmAw2ceraQWQBxXtpVH1XlSssk5W00mcMc6DGhs3To4y8L5t03p2mhaisIa35uKBAbb2dCrs7SQg0GUKvhCGHthrWunZjuo288WSYmHZDtsSDPv16zkvqPFZZ.LWxktQZ5p3smZ.ZXfzEDHyEKxH1KTfRqS_G4tshRDQb6qD9tNaLabFuEDKWoBwTG4vviplpZxQHINjQG2Ba3qxYAk7sHyipHlRugg20IdxuoN.Lvl_LAk9qcGS71ipxAzpync_f90nHMnlbBz1BcDjmPpVE06NO9N0IcO1BwS6qFK1CegWYcX2pj6LBBzTdDU1_ohbRM43l1KNdOH89S.y0XtbTE.n.SDMIahpdmTXYIMaz9irYqsLm2i7vLgZRcQV7ME.f0y3AITbAEfujGU71MXtTLZaoqc8NA1OldhKlSMlp0k9VcPOtySsImgmJE4ZkI1FnfpUYMUtSgXs7R2CDI9J4HwvpNbgdGkrpsPy56WCKeq57E6i7n_Ry1yVTegmvEksUvJTrzioMZcQ",mdrd: "y1_GY9sfbL7doFGP5d1M_HXoN4B1Ghgyg2W3zhVUkxM-1739243665-1.2.1.1-VpJZEL.UD2lKF.oDPGne1.qRLPRlmjgJa.bNGVvMKD.PvAIY5pj8H3JwPhYNJNJ7bcdJcZIEonhttWZAZ1UQwDc_9_R7lI3mgprEc2uBiXb2fbpq4EpozKh.4pcubjNdtTd5PAQczUG.Dh1I9RVim5QFY_0YPnhhBCr3GGZk4jWkhdjKT0oZ7m0EX3tbeCK_kSJqiSsW8mlLDZ.3KUqlX7p8kRD2F5hAoKPxrlQKryUuIJmJnHhpmpizGFrySlt6t5r79vgRBPLGNmJFsf_Rla7mZn.K1wdfoX_VIKj4eQ42xzHmPjOP.6TNq7WVKsquBqg92EOWxKnzJH7.5O3PUa4OtSxXEDstHrNHJ2QftjwOZkEmu6PBJET84T_L.j.QVFyAiKDvDHijFVbjYNdoZ4PRdQTJ9YV3VlqVqpo.eWMvGFTnJpI4YZxdlstsKuS5YvGJd3mV.i4DwowmbQtJvCigsvmu5mYXAefH._H8FJlb3UbfG2fa.PRLZqzwZCpwVYetunCbzrJwd9Iw3v4pUbWD6cy4ksUNcpRCu.bXP_QEkfXnCpWrGbp_DnPbFdicP7oT8mJytsoWVgKWqKgueJ7XI9yAmPKSdjz1zqB5KswPcZ79iumSNrcQcOwL8QaZPQXF0Kaq8MGAQtjW7hxLtmXBBizT1SaDspRPi4CSWcBueaJZOy1PrzVoHQJSUmLWVdtWTCtoisEj4FPXv8ATiKG4XXwSjiu6Ux.Jxza2vALKr9O.fuvIMDsvowmJ88AsD.Vp1YdyC6Klhl.qRa1LPzn8oVHxeIydGMtifjbeRF5em1K8yeZzM7gaF4oacYUA6vLT5TG3Q1Owz2WQotH14nLUERQjGd23rr6f0VB0MYZ3ns7RL60LYtfH6DGQAX7ZqsE5gnc1R4rRVm_T1TxaXfC6uoRsLrwYes3myxM4f2nyt81WCt9pU2Rwr1V3WilFhGSib0L_TNQO3SzT82rdP97QuoX9nvVkrlzY7J74_JG5fr8gxa6IphxZigroyIO1FTCG4ni8SbXbTV6mruaB0SIAu5dbokJ4wukTqSebZnXC5jKolCJ3S8OOQ2nYOY0Dc4YDLcRCgfon7U9cyzDGLCfZ._74.8Scz8D5DVuaacY2Zj1jyeFkk11He9QYry01SKQCq7PNs_8uwn43J00n6PYTiT1POcBGM1IUXd_JfAQNl61nIGUu7TXXnJ9AEsziqPo3yXTTp4ZmGK1_OLOkPK7DSJzaiaPuighJuXlTWJUgyboIh1dlNzSoxFZGqDwaVy79SsaSSGS1vQLlosAx7Cw8n.z9.LcqPH1vtBUYxopntW65LuXr.p2d8OLYH.WT2tCcYvHBUjFrkBME4g9AjF8VX9.RD0CA.ygFeCwcwwq9r_DR78xFqA3.9dcjxRxEOFf3SbkQUaXzW6rbD4Nz.5UBEhqfHhyo5hcN7d.cu58bbZfxr4LvqRqrqUw17YK6zl35_eTNRjI0oCxplPv5yK3.aW0qN0rWzze3NDWuvqVEakxJ.Hwf_HUyoxeMrNHlyjLYJrPrMoPmg7knUmdnLfkNSDu_Om.0INbJYciK.nYSDdHEkAhgjTCXP2FuF5a4MmBNkqRJnPVT5LyO3TZ_9u4RWOx03BoiyKbgjWRfnLbiIY1j_L4gAskba4teOskQFNI.usaRBQn_ZsMRbMcKm.ofKf1_mdFwPdaHQClO9QwPOyEqw8H5AZOTCn4mCO5xJYkg_yhRWUgRBjNjPGmT.FTMPw60f91MzSWxrmoMFFxVFTZNsemg9ZXCsWN.6XBMwRD5SW_iL5arW0fTEYhEj62yzAt14KTE7xMCGe0lpe1NrKxa2ldgjURd4GXCpiMi"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=91012b2a6b9bff12';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\/4562873190?__cf_chl_rt_tk=A2JypjC1rJmkfG1nfbpXruElLpfibWfGtux_RX.Uhg8-1739243665-1.0.1.1-iXuirPK5fcDs2l77d_caWZRGFWPmOAbjT3Fx72H1JNs" + 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