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-5612703849-gov.caltech-edu.pp.ua/post/0463152978

  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-5612703849-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fefbc33c4dd6e4',cH: 'e7Khmq9wNX4Wj.0m2PVQ_0aDw_ffIqOmGlzTlLQtwR8-1739220751-1.2.1.1-ZTOyQBcYz2banT8wJMmTWnqPnxcWgnB.EIKiMh7SuSK_r4qnUGPsWATcXpKM6I6c',cUPMDTk: "\/post\/0463152978?__cf_chl_tk=8x3C13h5uN937xqnIv944sqVqwiy04xBbQVmMxa.XVI-1739220751-1.0.1.1-hLJIYVFT_0uKYgs9yrUEs597shtgWLIxGo9ByVzE0CQ",cFPWv: 'g',cITimeS: '1739220751',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/0463152978?__cf_chl_f_tk=8x3C13h5uN937xqnIv944sqVqwiy04xBbQVmMxa.XVI-1739220751-1.0.1.1-hLJIYVFT_0uKYgs9yrUEs597shtgWLIxGo9ByVzE0CQ",md: "NH0FO7GM_x5cLTSKnqlrgzRpgq.wRdwXTHROXvGXryQ-1739220751-1.2.1.1-Ydg8GWPdKtY87YCk82FMOWAMuVYWByju9YwZxAfRa2H7IJnUpSe5WF1YS3zCOqWgVlOM7cBNYu30YNkaq6rRbM1_etasklqMLuHrgV5xqMoQIAjsrhRgRtwNiv8pFEC5B7_.jGlOBMami32uebe1tieSUxEKlkxXp7AOqOM8YW4efAJHu1msy.r4HRQPd_botJzlcXKJmXigbzsTkrBXobZTGOFUgau8fHq1yOCj1iuXVWZC5m6pKcPoGmz7iNGQhVW_7royHZteyfTHeA_Ym2vpHyueRjZV3x7WqDU8J3sfjW2D63r34cD6KHFJw2YxxK7SPpWqoi83rHUknd7S1J6J2A8TJdevr0M22VKCwnEOG7WeWibT4sB_m.JGBb6T1YClGJz6VZFo21Q0YtPYS.S2xv4xCZw2gC4TwWv2JqxcwtigWcFolxwUf0EpX6EaB_2rHjhlmXwj2Olb78dfU7hIZWSki2u.qtw6n7gR0EoBp9O9EzGuW_p14F77LIMeL.iQIpv4K3mMDqLn6am9soXIys7k6f2aGL8tnP2suyk6y_bFEGs2nIGHVZQhB7Afe9Lv2R2Sgz1vPedckGeOIzGOe9CnFG2B1f7IR2LdvcgccytN4S1nMltQ.ai_1B1ZidoI0l5p_E6mK6wAca4DTxNZTHfW9AlUpwyyYnUm1An5IedNNwO0gkCHTbNxV0gA2Svuk2LA4q7dmjtW05j2NkHYmHl_Hc5jZCaSbsZucG1muZFQeGQlG7RCoD95N6uYkTC7i4G7VUl97q72Al.ahow3j_FTheVBAlXEVJIsxMfhtGywZjrwyx7QwgCH0GfSl5wmVy_DgLW4sXKyRMBehfBpOZYbGwwAAH3sAnjfxxEvNUuBKOiH3KNgOZO.U3zImY5F73FGfv3H4CxOo86BduZdhoOu7gAP9XkHFRLTIcjYE53nsFagkwUgQ2W7HPsMt4QLKB2OUqxhzrPTAgEA9TSaG.0eaEkqYOUpg5Akof4XfExDhr4T6Fj8L4h0uwZsJ.FzRP776wvxx4edga3rSCJZDfJX5fr5lcRGUEPyGFzY7K3UA47HduurRJguRhYPYWqT1h.6rkLMOIDhicziIJSCx9kDqK2uajhHlKjCyKdHC9rwRZRwC5I9SY93yWbCDKy9xQBo1_plrB7hFpxdWOXWqWoauyLgRtapJAxqPRmE5S07wf6P9TdsMs6C4tFeJtuGxDqkxoaPEH_py3_r9RWADjzb7X_nQJOB.2tPBodp8_ARSH8SbYE5yxcSlZhH.HEBnttPfx6vljPw3XpEzW5LizCVlTq5mIYV1JK0ovmLNzxUJPoEPl7qKapu.I.A8w99mnvrvJkQq.c0JL6YRdCMxXoKwQcfaPd4qbykd9gY1Q.WRIzLKlyTwKe8LtDBuBLAQeCijWhlR.pzT2R8ySKjTpL1mQYqc0Rx_iK_GG.4K48V_BEvyWRa8c_oO2qXOzE1hXbloXAuNgx5kmhLQtgbfLwC7TQyD6V5KkWwLHQoDVikc_UmTOWq_Yt3jnqwXyNHTTk1apveL6WV59Giy7opkURu2KYhNFhap58SwNc2ZDdXGbGKwUlzvuADEInuFHUZvO3miToO.GcOAQzpH5xyQArBv4KPQ2Gl1w3H7lSPJFhl897lVbKubftD_9SH4ehu11Xj0RX6wnc1.Lx8eOppL08wnugAdXIwDysVuXMzzxuXFgaGlQ3mAmP3PMXpAX2Y0Z3JboL3T.ssiOB1zGnbirYsbjEVyg.d.8X9YphMeOjKVZcbXaVSxmAF7lWWSPcNTTf_XtXTfKB1DY2ZmQDwJijcuL_LconhY8gicX_OwcUCzKAT90hYl4AbxpVpDusz9lFosD_4ebpdDmEr5.488ofyHxM6OPo3yXnNr7kOFOlgu6mbhI15EZZnertaUCFgvUDef1eF2V_35B.Rm07_tIZ1Gf4WGBG5JW9D.WnEV9uof9F7yNY3QDG17kAR5VBwS.dHvaQlvkZofoeqCL0S_2__LmzIIATYg1FFfOfa.XER4xe4TQ940AOs9si.NprhZYqDlU5o42kkjDLuPOg9yj9gOhRL8Dx7w5GAVIShoaClA0fC95.B4sJ7gpVun8xWLUMbIKrYnVx3WvYu_kUjEJphMq4.fhy9tUoUtPbIRFAkcAQDw4cZBPo6bzLuIx0H09kSpMHucKfVYCp9GWxWMvcqGvDfcaQI9by6rf5p2twOyeYQ_lwp1GliVokdEdAO3s2mF.8.9f65cRErFA",mdrd: "13qe795FmG615EhzsJTH4RJeMulJaKMbtMHdEeD1I2U-1739220751-1.2.1.1-j1V4fDAEnoAH7KD86UZjFgNSwxb83B0cRtXIzu__8qnK8_tUWsGiw38XWP4XxHCUOO26WbtpBfvXZ7mY69zbIuY_wBU36OmysEBmT7LKhXOpLE8UACGwIQRstVDD4P3S0ZSy9mZ4DzHij_tP9zB7hl0oJZatNGRH5TUDUC.3JSA2x0eaiuIl0BAUMGCXjWfb7lN03bKbthX6Ef8oGgnxwKlwMVvdEt3Gp1lq2N24v.Xqj3obK2ar5wBFew6MDUNAm1RjE768EMvItXIWOgsqtoBtmwoyrkSlX3P7oqffkaXOYgaXCoQeKR9NOw63y_3B3F3CKq5aAl1V4MkHrT4NdkbskKdHKPQ.2.tkYEMw6WzqELI584cNeulq.8zGDjJxSkRzYMk._5e3fBJ73JNtIB1AoBMs1vo6S0rWbBa9tIz76wnX15IoC2gnw8l1OuVD_vqvKspRGqSf40EJWaVdNl67t0fl0Joxdpog9MpWX_vE8gYwd92TchfQ8ErHPWMGoVFGECzrdnHrZxI9DNXsfhITVXeqbffOhYC6p6a3ZVfNuw8s0QyoYIO.Sd9rbyUdqhWC7Nn_rKK5WmDhibgXAvfF8w4F8Almh3qczW.6DY7NIqGTO1szjbbCKYrC8HD.l0r9LnUrAgh91HmjH691HZN60s67K.KTyXGjnreqGsVO8WEIX5Nsjr0FrN98Io4O6DYKDipV6weroNZ2tDxJOrq3YpgRrFfZWvxQSdRHDDp86M1fS_24omoZEO5u3j2D5oDhaS6ZMHkQjcE2P5BmlJeaVfdUQ6V6KMTCmb4_50gWBlYM5x6zzoXNgpGfSX3z_MTmP9NQ86yWson7awDTzSpwDycm2jQu6c4mn5ZfzzUHh835NgMeA.vpNr980CcMO65UZLIEX1O.X8QCYp8I211T1565zmehqu8shkHDnUY7v0Lq9PQPhMJyDuoh8PinKTFJGAR3BuJza4N5qH._xKgZj60x67sKFrB5fvAeq_CfYIhUqlC8vkLZ_JzjTMfqqnmVhqiqWy4SZjo4dbGHovNPOq_u1X_S3bX3U6sC9Z4Rmxil3lO_n7NVWpWplA5axvWdcVuvMhIBYXMvmjB9RjE4BHFH4gHs3Qk.DHUVGjMwwPNzA7sbC4krqDSREpz9qYgexi1.i6qKamBq85As3q8WZJtSQN1_dW3FjAvEw1SQjJ518_P5NWnHTZTkjiyKger7lmRhsr7wl_CCJR4DOwfqE1y_lg3._VKZOJ5LsADB2A_JUHGZC3AGpMEVhj4ibPPULmXzMtOOiGDEmvRj9Nok92NWcAzSRsorxDq2tSz8UBrLp8D5hzYr60wWHF6e4yowTVEmkkra0GyH5IpfY4sEDZ_A9FqYfGuYWey_rtAUA_xLfCyK4DVdOb2URA.524cxlFUY2TP2ROmUfPn._nkhfc5msPb5i1GlepmaF94dfymxdIf88c9C6347zC3LKLMNQjE1IAHjopN_tmFBr1DDyEw4R4y9ipevz7qIsClcSUw93jt9fM15jSEIrKpn.jiHUZB1PemDR5bBn0_gLqNBu5nZtFWOHoc5Ap0LKy7imp8.H9Fij3BAESiAKTWBGzJLollSmPdAF_TXVi35lwI.0l12rV73hrOGRUzBnNmEdplCdcffBIbFNVXcVUjNU6s9zj8BmgBLLuZRanfcEF1XskGskagn99ZO7PjR.ESwjttFKnSkUMZ4FCHY1gcuTZ_igdDfoqwtiI6DHW63iQiiaadZ776CNBml1O8gEp5iktD.h4KrCrxc12WxsP8I83qE3oRPr_6cdGWFC5jPuJr6fTtoWCsF0_WxAkgynXaaPx9hLhEy9kKqEhGFDRDq"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fefbc33c4dd6e4';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\/0463152978?__cf_chl_rt_tk=8x3C13h5uN937xqnIv944sqVqwiy04xBbQVmMxa.XVI-1739220751-1.0.1.1-hLJIYVFT_0uKYgs9yrUEs597shtgWLIxGo9ByVzE0CQ" + 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