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-4671520839-gov.caltech-edu.pp.ua/post/4671520839

  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-4671520839-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '9100eff1bc7c9c43',cH: 'AdkQQfJ2csAZ.uPpylT2tOKJmu0m3bOZEukvp.KAx0g-1739241239-1.2.1.1-T7e4.YYiUDdUpWn0FIZgEgdcNvIGRx3vZcBgw2vUpH_zIQRWfzv4EUEPEFabQ58z',cUPMDTk: "\/post\/4671520839?__cf_chl_tk=imVcV6NVcFWEElhw52b3KVuddSc8LGyT1h6Gk94OAAo-1739241239-1.0.1.1-VAZvBCw2phGBMiluyrJaENx30DFCOnvvrB2ozYrtuKM",cFPWv: 'g',cITimeS: '1739241239',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4671520839?__cf_chl_f_tk=imVcV6NVcFWEElhw52b3KVuddSc8LGyT1h6Gk94OAAo-1739241239-1.0.1.1-VAZvBCw2phGBMiluyrJaENx30DFCOnvvrB2ozYrtuKM",md: "dO4FcIsv4rYWq8hbNY5J38U3qU1wvD7nAv02ABoI4nE-1739241239-1.2.1.1-cEsANnldAXEz_.3noeu74T4V0Ed28rb5Il9PSZeaf0re7jcA9tXG0FLQjoTHadmCOjpM7uqW3p.t1FsrMrbJolvANjmlYrgnJaG_D3qTBYBIbab3HtRQzTmw_60LVAxhqMRIeC60Qk.EpRyip09uP.3_jenBNTk_mQuYqHih8IIpgCQkGwshyGGh5YV_ZmLsv8wFbsyCIyGqFhRyvTtc7_Xhgpt8Req1eU.5_aON_DD2j5uE6Yyw55BXewwphiQM7TtYATn8YV3UxTpQaD_DxytOzygCcFa.a3y3YH6N4xdJnql.KWPLNvdWVnDG_H0yRsBPDxNl3clyd4oopAfm0cQjFCWM4W7U1iAN9vZcx_asDDSyXD6YQ7SBM9KPvcPheX3scwIHNjY.GyvyRn8R3J.tUyWsxgcCnD0d8RTbFPsdTpHlum2SYoxpv4sN3yIwm4L.U4JGDEPD.jypj.i32mv03y2DDsU3on90xpjN2igjtrYs3FOUVjNH.kx84zCUA7amuwduloZhnHcGgVZhMJG.ZyzZ2MSF8m46UN6IpiB49.nH62MjfgXdalrhMze9i.jOHLs2FELSnhtCPnZf41uX4F6rumLNKQrKA3l6j.sfKkRQ2liqoZQ5rJs_T_BfAbT2tcda4IdcFCF0.23bdZiJO4LN6wwOSZmHHXLF2dt22oalc83Y186Qgo381DPTsNS9n0lpfBAWVkiTxCu4DqKZlkZUd6cpbSc4z4OVTjgZu2Bup3nEa4bKihbd6Tejy0yHy8HngbAipUd74z3dhP6Lgv42MZuxifGIElFa0K.vdE04m9wVkwuD_5j7upJhx_tm21yMOZLKxO1cYyh4auPhGAdrCN.kPSqd033EfdzLsCp3A7M5QtFwYnn_x04vTRw8DeClxmr1XqxkbUqPT5MFIJunEiKNbFSn_H6aVQMyXQv0Zm4UNHGECd1jfkKw8RTdeG8YI79DbJbytqiCa0DvH1DpZg2OGxq5il6KaQWCu.E.q53RFNcn.PCSHhoY8FQudKv.aAVTYBS7Oi7p.QQVF5bp32X6pKReHp3KOYy4irqi1ZppLV9H5.fAnc1EB1JYDskBkBVQv0kdiVQDHRg8zNPfTPfRe46hXjpCg1Ewk8xlhZYYXycvQwM01VSHU_45asVcvaNo0Cg.FdbnG4j_gQseAum5epc3n0KDlNLgVJmMY6k3ZTbcXIjqwZI9In38_MSBF3.PLCtwsym2eP1KVQD9G19dQl8QhPRCGNproTQT5JK2.pgAPkvloFO1qpM2OubG8_0oPZ1EsfuOAWRSGm1xIemf0NC.wehpa4V.NyTbo8tp4zul_pRgsR3lhkKPDvtbdj92zMAAw_FKaqBZlWHizKZndWNmO9TmZzLcrBNyRrrq6aa547VaV.Y0VWQu1ImxYWEPssgFNsm09.4mk0TXoBaZqPRmgsNG.YNUjqKyuEm.woduekzYWdnW5_uDSTta4kOFuK_N8TAa4yyi2RXXLT2A6i0DDrr_XRu2QLbKbMRWoXsu_45gLMxAwlHXs19dUrPl.dUMhFHv1ydaraEG5.pQj2CbFQUMvATAaC_71OVZrJQHM_GYCDawdo2s1fbJT7YU7NOmbaMpx.KO.ynPfmfE4cjx41URXkkdsQRHHsWIHzWJZPzdzMGxYZyZ_jI6s0_SoSnPveSmMzS9PweIdxz1u_PJMA3HEEFOxqUlv0z3AVU.0JVUyhXOLYTCAY7SeZix2Ii2BhEwcWF9233Sr3BoIkXa44EVOxNYVmfp.n7iZUxXOrzuyrQ2H2mRG.aTE2RuwSSoeKE7ijDyXa6qKKEf3Q1eBvwJt1ghWaOddewfQ9X2nTd_YPvAdGXtZZ2PBhErOESQcoP69djVL01cqHgPaLHuXVmiXiAabKMO.x.4wBjeGS1md4sI6DmdxLMIbIMrxq0p4kUhB0AGORjKWwCnIaCT81HYyGs4PWzObYthy.fnhpqHRJERy30njKCNqbFGbMkkM1eEXiNvNhh31dA029jk0j74Tj3ejkhNonxuEJ782UisXbTgYugWhf.xlIEIr.nQchDacC7xUgk5Bii5rvfbRuFpvyhwSGK6geW60qcjUf46h5S4oNcD_JOg6KdLUtw6iEz26B6vJq0IQvq1eL_u6wVr2UnbOaBR9ViuFzU7.e_RUjXoliXdExXn5DifMEl2.S0hFsFh57lTzeY9A1HHhO4.YIy7TM8N5CjGcAwwDup4EO2TUcBoPTpNfPcCQvYr7OBzag",mdrd: "Gm4IesSkahkrnTS6ZZRk_NCPOXc99Q8eqLd3JOX9G08-1739241239-1.2.1.1-NQD.703qZbkcdu5FFdaLpRZzEuYSfpqrRaAC8m7KqTwOfx9CF02k_69glB9dusKLcPRA1ZvKaYviD3IR3X_ItWCyi4fLRRksOrcwDQ9g1we4wrCbrN2W3rjHN7jA0_oqysQiQot6FizR2EFQss5i.JkOL_jP2IXYRwx6XNb_LkbDpSmZerFOWk3xyDjfBj44g3cNSLFvDB9rtqZ8jusd_i8rKNA7nkADKbaVnnZi_Ar8w47JFPvwOFagSUfFtkVMxMRILPUd7DOh7Z4.sxV5pr4c0aMhPkSDXhdreGhvwa2h4ZgZf2NWRWFO.dL.bntyozQge.OTA.6hG85uzQLrprv42GyYqHuZEMTKA_.v2Z2hVQbHZraII5N1aWePCOk8Y23n_a5UWuk5MGEUPcE1MadICozJbm1xqQ_scvnqhCsAx02x3b1hWoFjvK5Jg2TCOJfJEVfhBb_kcHZTH5MxujgoLtjVUqwwgc7Fa13LazoJQagE0uz6QZTGfjSKWueUjkza16sANcHynEGFCSSdAv9GaZLivYkKizSXkvxuiToUvrTTUoKf_ZaRl0OM3mezCBCUO_0wrTYXklQ.x8r2G_9K0zm_Ta6ViONCqRndaL3oNskvQFydknkG9v10Lsl40nVyAHzydbv7KDGss4Q04.YBHsyypf8XuEOgBky9AiAWmiyUqSaWGS3i.uvPVlY5AlWCISI9eD47DIfGE2rZR1YPupdl2GR_y7IwPioIH5dal.bW7w8XvU0UnSoY4auXvWSYz4ANLdYD88cGPPGQOdZt3HTiMJDb3wQZ.rh2hnDOLUu_U_DM2eIULKaodz5wzqf937R.8J4akOQgJYd2zGI3ee9xHCRbG2BjPn1RDBeB2_JMYdHiVZq43TQlEfWYPtXM5mZOCcvlWuCJB3WEt4YyjM44k04Vd14WTc.W4G1c5PSXXgkKNsnokhP1ftk.JahWjIW4l9riu4pdcSXONaOBmTq7nrNRrftOGG2so2s.f4B4.4_caHw3kBIslcaTppP9aPflmFFNMLSWm1YhMch7WSUjQHL9rE4tsYC_LdVSG7xUd0ZRaJ5xfjGv6u0kyKZd1V.d8B26yEuvH9GYKJiIn6K7t5Ed6UsB.K8lBRoQAoh21bQePLBHnAAGEz_EcyXf67_oPINqvImW40ZaUZRCpTS_l3pvAGbPXQhIy118fB2u_0CWtNT4VPYh34kZeeHQr8c75glEC.nynEs099IGeUxGGTSglhlyKjqhfE22Fva7pu8utmH7iOdkD_EGkAWJO9Myu5SU7mMJkyAbVa51b289a_OVx.7xcHCf2pNpbJmWKAiIh55844OTIclWSj02TqIwS9XEhQlFlQxyMUoYm.ccfy8ttmnE.aNy2xzOHHu4GlDQ5L9zKury2ICNx0EddMgV_ugc3M4gAp5WmaFlENJd1wJp0aXvoHIwbKNhrivCZ3VPunC8x84vlf510LG27iLVEcNm4_m9XPGl4TSOm_a3n4X7COu_Pq.w7.b0f7mL6m9u_gD5JKHStxFOpRXgB_MoV8W.Ixm5qrUj1h_U3.qwJcib9GRVkPSUOfmFrU9q.xWkaIpUKEJiN5IS3ptJiCrCQzd4O16Hrl1X8H2RiOgX0n.hmMB6tzUWI6lx31tIJWYPzFxyskGPdG.bMdXzS9XZrtnXeF3rUXC0uDOkc19xvn09ROI6z3QmpFSD01QAKiZwInMD4GDzQxf.LC6baFX6S3lhmv6TyhzTq8Le6schZPJkZRbVdBtkdXJj7YEpkEvPbGKqMZ0pHF55Wq1NIj7n.s_6Nnl4eGZmXgwVcepknmSI2R_.5ayGQHo"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9100eff1bc7c9c43';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\/4671520839?__cf_chl_rt_tk=imVcV6NVcFWEElhw52b3KVuddSc8LGyT1h6Gk94OAAo-1739241239-1.0.1.1-VAZvBCw2phGBMiluyrJaENx30DFCOnvvrB2ozYrtuKM" + 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