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-0945286137-gov.caltech-edu.pp.ua/post/0437921856

  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-0945286137-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '910121ea78ca81eb',cH: 'KSuY9iJrUh_OSohKzLo.8NXhABWR4zZkfMvjt14Ef2w-1739243286-1.2.1.1-O_FCwYlqrDyA361kn5FF3y7dUiR7OCl2nkZljb18Y20kvg0UcD3bEqyDbjDhcdPa',cUPMDTk: "\/post\/0437921856?__cf_chl_tk=XP_V10oVDEqKhfkgoqUZpqC8mJS7OtEVI9CFBmBgmGg-1739243286-1.0.1.1-b.P1B_IV0c4IRSB4aojRF7oK2vJJxCDXjKlsWMsoxPc",cFPWv: 'g',cITimeS: '1739243286',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/0437921856?__cf_chl_f_tk=XP_V10oVDEqKhfkgoqUZpqC8mJS7OtEVI9CFBmBgmGg-1739243286-1.0.1.1-b.P1B_IV0c4IRSB4aojRF7oK2vJJxCDXjKlsWMsoxPc",md: "ENSvYtpkrjECjyntH7I8gXXFe9O9dcJSa9Mq_YbkFMQ-1739243286-1.2.1.1-nMb.1UowHoYv9qk6hl_zugvkzZhBuJcTJhDbAIci0ccahR4Qfn4n5GPDsDB3TfM1dFqeYK_AdQtgUzZpMZNigggKMjz.qudC_Yq5hPcxePD9KrncoI0f6OGj5lxI640C1jPwRjVb060RpQm.s39N_35515SnegNnnPgmba4CrSdZMRbNvWDfZfyZBbGRMuaEAW7B6esjJ41hAAiFXTkzgpljm28gMyoHqiT0AdeDiOMAoj9ApZKHS7Mq.5TNGFh6Buz7GcK7gOSdpei_a5WEgEuniVcLYgR.JDpULnPINf1hKZNpN4wWGGxoh00zHlxTRMIV1m622yADxcyXNt79vOp3scPffVSJOtFndxBVjRcX0V0FrTequkKazhnk5Y76vUjuTAJ8GkSRe1MEJvL5Vwxr7XLbqjiOmh7J1tBx2a2V8DccxrMPDC.sBv8EimI2QguGZQN2w34ECH.AE62xUjMCQSm3F3rK97lIoBHrSkwPLUNjF3Wewy.uLIJBaZ5ywrLELNbBK.LqHRH0UCBiKOokdaklkTvyJyzmQHChc55YVgEbIUT7Ub28ODFbKwDtmT8j.pOLGyXxmSQuPMpDVabF3VQTfyiL_vdnevnTcw8PZjv421Iug1lR0gULn9uhZw8ajk5XBo1K77BDQ2LbTb6H5sgkzyQLwwWyajnQeP0t3LGxdICK9tqamv78dktJjiirKjcbC9bkTFKt28C6m4dOwAqSb1ZU603lDnDv4.LSk.jWP0QbFVuwpEOdDRr1cHnUPst3X9Phs.IXkhm6UTUjphS5Lk8ARwcSEYTMOuttVpl0EkLwAaZLyoE1DlFDSPooCQ5eJfoQIG25j60jnl5GHA6LMbZufb4hGfNpm6VpfjHRTjleJHxnR_H2J4fBKZE7701Ny5gg0Z9i3TeCcFNLyJ33pT5ztzMFlimfVZJb2_FFlvPpU9NV4hcJxqsycVfJgElM8k0PYY2DwnHwUASCL.X.luw3bQgAxMEm.TVczUsHcIz0qA9mkPXrGbiny9Z1purbP1b47YL62cy4uKrSBe7.p5qM6W46g8RcEPt3D6_GI7jFsmU4gqnM9os1wXN0shlB4Uy4hDU_kY6N30l5oGPoSU6cU8yhQHnwcU15f58Edtdsye9CNbA16bBO5IgEF3gQc_NLZkpWieFmXlKHSFApJGLR5UEbuVZtPTfqaTZAlLQYfH7z6Vt5M1.Q6TOR86UKG7dCGeKIXDJiTgFX04MQ8EvWzAWefZjzJCUx5vhF.6h6MM4tiw0gnLk7u0CIFTowjsu7J3kwPKzL_uh7VEFXlrRnmNZeOwvZ7jw.ZBugMGXXWqQXwmLzBd9H2GHf8qpGON.lJd9KmtmAi_o6L2e874ZVbmVm5NQbvnfZ06bz0N8mnp2nvPOhD8__8HcM9ZsjlEFez98jzsisKb1etMFqkP8fQAvKdNHONR9r8oIqcVIe_C9bsOe6zOBk5MZ59.M_hGBsshtTD08Em3Lk69KlDGT_8uUknbf6MHwBKxbgm.xxJm39GDxG2QPJjEtlx.PVQISzr0wiA3u4H7qpE3qfw43mvvECBkjRO4YfZNJGRM7sYmYAeJ.r2Fh7fcHejZ8sY0mmS7jIpzELy0fYmuXYkjWSKokb60h3ecIi60TYU7Rdlwkqy3fIvtQF5i9e4QmN.VP9lzZ9Ka39l.lnxwKHQrEk9lXtX6iqV8gIGYYiC0TS2wJr1lD7lx3uTlgVMPJFJArNSqe.uaXES4AX_2HHBWyrJYvQfJNi.01tbnF0djhvvCB2fuF8i.TijCbSx.dtoW.pN_kxi3VTnYLJ1g_SKRO04mPCwD3kUcLOYGY9Sjf7D3CfVuk4yIY9m.3RSwYeE.oO9WTO2YjongatpYhvPle0o2AkLpMKbv5WQrHPpH0QctvkHdnxJHh03z7iF_Vjf2y7yNgWxazgRxeaQhD0i29PNnlfmrCBevy5UitydUIn88BN30lO6A3j6bKobTglGyaVDnuC6dGOpz9hB38USKOgQEcBfLutc8XVurP5qn3BSoJ3b9p3lIiIILMacmNdpn5zEabvCHrJYkAVZJupPkudmIh23SQ3E9myp8RwMkkRnpcdqNLjpDJhIbHL4lyg2Q2obIGinMxDK9SrkdaPny51miBP1w.Crh17MVMPSQwI.JjriZ0AK0NdU2TYcqOhyZd7n072EyJjIOqetGSBTpk8DsE0oOsGOrbXNUXe_sNFWiNmglLJmRXMScl_5fLI.0L7_nGfYnwkDw",mdrd: "m4IT3eexi2oryRMhuxGkGvzKf7XNgpe2PYhwkQXSK1U-1739243286-1.2.1.1-KLpg.1S0AUQGL0IlPSeNqqvFNxENkTIMyDUU5GsQbK_tiMLI_KqOm_pCaT3zEizfA_krKF3E_uu0CPDfcv7TokyiUhJ7apLrI.WVySVU.gDSQwS0yZ1U0MiO6NXbfdLFT9GQTL_lSQPfBhoNb9KTRLF.F.pWf8PDXevHp.6_0AuP5x9UOtPiqPKMKhl4skmdlGA4yj5jRShReBn3iiumo4bd2AXm8OkOYqXA.hZvJJwyzfChJiBT_FxIAYP0qVinaY16Y8y8r3Q2w4KAwOt2r5A5EFxkOaDeBwYxrnXzdb2hpouLOgPXbwk4RPy2FBgG2gfefroP9oO2VdGtqG5veFlc2jHwRu__XgJ1r4yRyQt8M5L5FAwifI6EBWz6UfI3KfsWZhImGWb7DuuDDb3HgikL7SWrYW7P1nSWStEOk4nvLqN3xMoq13lnOoQA7C8fVVi_W67x0on2KUiVc1Ejm7x93X.Gi1wd63jOHYYl5RgvTBMqYdX2W_Vegd0chJ_dJqhTGg26LmBgMYHFnG6_wbhIlyETC79uPDvxvqpK_uu5IoJs6N8VnD8rBAFLETfKjP9h1dmILCwtMPnCX8cQftbAjJM_A0jLa.S5_NhYLimmOGW5TKNCMqPUcxyqPkA8ZXrem2Mcj3.L6YB0MDOLBDmkCp1ILTH9GeGzwwnVJdKbV5OqMik6Rhho4.c5BX.qh5qWjGL77DFFUIZa.Yww9JnXmG8Xi3W.TCzahJhUbvK8p4iR12lgdBkNfpg8rqFI.1BnYFJpk2wrUYjL6zKjM3HJxWzTCSXpm8cdQH.iSYzGrLTb2sJiDj0diCa0qgNjgIfivqMRogdo0gfQ7DD4YlxdPLmXqgYsDM8Aq4qn90gnwyUpNZ59PQViikkdf0f5MskQ4EZ9Sv1uE7vEWjt7XBp_WwhmY8Fnx0P7sVPl1MEDuXPA_yVtcOapi2AQSWWKqymiRWr.o0ANIfpE561MB.lx1MfyzYqCf2z4jKOHkWU1PaHALgRG7cFdjUtGlzNdwE_3AXbe3NM8nNqQ30FAPZ5BVxtyRP2UFA1yuhSoBAdHaCp.Xr0P6yFeYwZ5fxZ7uzMg.2XTq193oivXcFUufW2vZt2L56u1IpKi7u9xldlDW6mdWODh3YAkaWU6pF8URc2XjDvS8IhGtte7IwMUm0SIMC_0H6VPld.wo3kgsO3I3R1d7mKvAZKQdKpXHjkuvZTpeV.E17mG0ifgDt_mbUITwtpnoEw41WZL.fGS2lpjNafKSlPxPTKATVlxDyuSPYpN_aRdZVfKDTpMsMFxPRgGHHozuouc5aP9mdwSggSxMnnbK7QUWXhyYBzWNb761lv_mYLomOfPrVVIM012YBGONJpTfRKJ2pQEngkrJtujsRBK8krW2eeZMR8VJETLx.9yZo.bPYpd2LIBbUXb7v0dH3Wcl0jtTbDU.0ylAeyb8R3UirEi.BD.OtsercULoPQGw9kM07YcjgJ3_plF3I9EYaQuYeVEti2_dK.5uZzaR82MdgjITC5laYF3Ib5zoCke6txWV2NNSsqVq9u0CCERd4mun.4iDRfGlnkg4AXt262OD7dFMvxutc6cRBZcnWkJQ5UR9BWY5DdN_paFpheI2FnvNypV4T7HT1BoWmV56l.FbygW3Rs9nghRpYllIsGIkjiqLe7riPARlzjltbe54tlhOuSJEFr74sUXInJftKuOX5oc2P4yWAIOqN0WX96PQ6JPFByDcIePwR3sPxrwizMeNYnRuCjdkak856hb9BttP3KCSqkELPZVnlPGxvwIqeYgvyIASb6oTt7sWukYsWNgEtPNude9oTutwMp.exldY2gdz.731Y1YeHNb"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=910121ea78ca81eb';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\/0437921856?__cf_chl_rt_tk=XP_V10oVDEqKhfkgoqUZpqC8mJS7OtEVI9CFBmBgmGg-1739243286-1.0.1.1-b.P1B_IV0c4IRSB4aojRF7oK2vJJxCDXjKlsWMsoxPc" + 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