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-1957846203-gov.caltech-edu.pp.ua/post/5062891437

  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-1957846203-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd5ba0eca2d62f',cH: '7CzKYsRl59Dy3efk2FAOEvJYXUfMmvGxZdUacta4hnU-1739203707-1.2.1.1-vgzCikjqnAUQ4nFKThCA_Ivh5yTFxA7x.e.aB42k2AJOvC0KVhpeTbAURqX5se3.',cUPMDTk: "\/post\/5062891437?__cf_chl_tk=CdLrpRpgFW2U27yukzrSRrZ4LLyx3PbKVhpEUaflxOM-1739203707-1.0.1.1-yxSFFn877kKTr4mP8IUW5.q5z0W7kcgxlVSEnLvCDww",cFPWv: 'g',cITimeS: '1739203707',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/5062891437?__cf_chl_f_tk=CdLrpRpgFW2U27yukzrSRrZ4LLyx3PbKVhpEUaflxOM-1739203707-1.0.1.1-yxSFFn877kKTr4mP8IUW5.q5z0W7kcgxlVSEnLvCDww",md: "_LEwC_mdjIGSXcajJ5AjdgYSIUeYjeX5EcEmU3d9THs-1739203707-1.2.1.1-EhXC7Kabjf.DJ9SAzd6M0P.aBBNbC0Hx73P6F81oaACFTAjC0EWZu9zaqc8mPMm5CAXxyp.Vt.8AOXChSTcX.LZG_kFaT.4t7MN.riFL_C.xr3c5pSbAURYCxB.r3RMxFYC.6jM55ynJLmK1voqcrD7goaEQpGrSJCFWfwJgIIAbPz3easkZIEkJbn5jFhMZFSRBfVO1YnrqeWPoumuGgDNny3_FGfalx2e9UDuVmqm3TWEXJOYRbSSqx2qdrGb4IIr9XU0V.SPNXOcneulkNzFM4xh0SOeOIyf4J11Pt0zkboU8W7wIcPH1C6CVYJ54h7ikuhsVBsRcFhSqiR9DjQNdLZTsosVHizgrrPfBo7MDAM8Bjc3.2aBw0Dz5J3OYKv1pBeABSdv2ZHrOa_0q8VKNR0LKKzOVe3kPPkTdk6epyZpcdVrNs8usWw0.CVEbYm4mp9.cRx7ZJp3Qt43kkvdD7y1sdlalC5upN0hVee5CHoNl6yACJ5SdIVvonq_j3HlUl4PVMwN8mVPNCqFHisv_c49Yu7NB19KCC7XnSRwYk4IhGKbRIceQ2mymfNmyUzquAEaPqVH4jDeQEQF8nJV_2m1xljDoAhim1wNKPFY6ctUJBrrODXT_s7omyHyHSJw3bnXHFLUgtIw3A2KOF7l8UE0zPEQCdf2kO4.yN.6ONPBOUj.Cwg7Dj03zNczmJWdcHjQcAZlGuk0BqU55rkmTiImfGqcO58tlQO4nwZJQHCQkYBRudkh.BvAQlcAmER0Vx5V5onrB92rFHC33l6qqTf09A.62HDRMFdJIxywejZ2J4JcBtX6YqELaGNnav2nj1q4evYZhr5M_Ov.3wel0svzp3KnrMibtqaonMpmjPsFBGZZERFxq_NQ6I1rhzZbqnUJGZ7_4LE7kIlryMdq9RkfoZW1X_LokQJ.SCRNnpZEnIRWeZ.6OagLMIiGmtH.Va7t7zug05_pBJIqogX9xVkQ4juu0QCZDJB3N.iQI421aHZvq58RImkAOfz6ELu7ZwzQ4HGG6LdQ8c4HaukaBMwXTmPpV_Bwxtjm18wQ2zfNgLjcqWNunhNKE3Wn4ekjSKUudq_.ZsDB8GCbTU3mKnYdluP3z2oOLE6301Bh.tWOJWvAO.e8bLrswpl.9SYnG7ype6zBkz.0YJYtNzkLHMMAhtVrCBlhW0MLrrAXaglhvLxkfRhEcjzcJyLwqC0OAQt_zhIXiWk4mejw8dlVEUcbC8_imA4O_R4z6VhUQGfJ3V1l9N1vQSi9U9v5ZikqlXA0cCywTrJmqEYu.5la5qOgx9lAofqlYEQCqBwtha0DefdsmF9IrdLhJrZBoDw7D1jdR_JR7JQqG4PVHKcL76RPaqMW.u98UXC1SrU2HaZqlM4Q3e5zlkSNLW9Nob88ER3ZoMRWSTnTdKDnzTuoYQ6JXDRt7AIQ2PWWGI7zd.EZ.WCWndhfGDnMBa258Ahakl.I.6ZtAzUCYCaE8UB7mc89l3Epxp8ikmZZco8KEQPGKPgMeg6qK0.2PQuuYrr6A8uo3Ap41GV_lPWfoJM6R7yw98mYnTY1rsTUwh5IgrsgQ4BTJBbjSC8x.PEJqfXLjjoGSFfIUWfYeBV4BKqsj0tIhcbkE1E0GgKiYTBxK0OOq8iSdjkU2NPoRCzL9GQjrnBQSODX6hn96rYsDFalVxWLpMZJBska7C1GkxtewmgagSY7awS50mCKVV3RIev7iYoQdsVwhACDI15uY7BPIXqv3.cTCrDGboWgEe3lmduPsm.6mebWWqOhvkz9R9i53COJIJcSPEfNkVya1_mTMUYNbjW2CHqV0l.hUxHUJO.nNNWzJdkKXF1kDTHQSqZ7lv9_zhR1eLVhwvoNFYz490qWKyM8LS2RKd5HI0_VPd5v3zEVIAexYeEPhVVXGfmkbpr2yPUlzUGVDWeqcbdaGvFzZLipwpaZAZ1EpL1d.VCA4Dx6UGmmZ6SWUmb0c_zn7cxkGTd3.N2YKGw3MH0nbVHs..28F.mOImL5eAnz1WBuKtg9djcatEaY03eThavFEl8HyXhY3MldD7c9Kk8kcrF3czo6kilj.6UwLMGz6.GwP16W7pKtwEAxB3GWe_MKViqi4dgwXYdmMASqqqm9ZykZDQEt915nIBtMETu_h333Z0ZjMHSoQbf7ENMu9dDyhmjqgBrjwJhCUS3DY1vNaTFblZbiZgcesYih576_hxl6NSjVIIWE8NN_e6KOaHUzoAuW2gA8QbUlOYXVCKQ",mdrd: "FA2Us7QCnbNVcH72BFIIYXnvMCByN5YoXVjpswShbd0-1739203707-1.2.1.1-.v8lAPA9D8p0jv9uxEyBblPbWhj8xv8PTzpDxiyRHGXmaYo3Qm2MgmkuRXGvSO3adRCgZR00S1Z8VGSkyWFs3xDZAWZelXvIKa6oWinjJa_n.sWn85JjC.1bdbRPz4a.TeqCdmf3cEYGKxHvY.3OJCpPWOzc5dWJ4VAeEb.bn4xqHfdtPocNe6Js64qh.Wuf5YEnxvsMGe8hX1ENArdXE.44rG6C0YX_Mkuc_vjV63cIIMuj5semTlRfeRfz3Tp7JxbIDhTvL83U2hmKeywuPJeKwUL0lSUQhxhVk0bP5Q.jbXsuqgVBU5nQygoScvzRPlYJEuJc.Q7g87SNvYUx50k9ao7Rvj4.lrGmUXGAreJa5dBdl57lS2_n8aGUDMgqAWaQ6plvG_StqZ86ciEEeWomEajPUWg1ccNqkDbIrY8IYDFB3K7U0YnIPwDi_DBF6yty3ESfiKNx7c.4GtmvZfT3_Y8LMRi.ef66DSLOavMTpzmM8teF.RISNz8IVtzMzY_6pjCEk8nKUhq8yON_gLTVOo7FqfAl9MYy4WLNwvrU_wD.YNJbN3Hhi9ufMSto0rtiJNgsEB_p5Sn2W.6ckLYk9iSSuetIilnRJ1dqEyH7QC4vN67ixEzgkthTJ.G34U29GdXTygZrsidI0oyJODrilZEprR9GEndOyW7ds0LThun7kgjDZlIJa8Lqgctc_lvPespR5JGHWi_pK_M7LfG3T5kmKGk6AE1RWCwxkplU_lxSAsmD26.SvrjVNDcs9t1y1O_YQsT6faVniVRd3Q_fgzqanRZG5nie52UY0jKtZtM5Os34j_UqAzxtL9Y1GfnRIakBSF_eVbcpYL_dbZjCkaRp0Xjm8G77WR8IfdkBRoctcISMo_DPr.p46CS6KxhXiWuxE.4Do6qh1De2dXosA4.twNh6c.n003Xr_84IO6rEXkEuhLfcAxSe_QMkKFJJXfhpzVimmaRDqRMQBQHnXeqkaTs5FgtnmTZAz.paSXSLKPDwmjxIMRoiet8N9qTiof6694Dsvth2yWVNKxWvW4cXErolljQ44.XVJGA8y_ZJ7qX9SNbcGDTwlJdVuDR.fCa2bYfRNSvI.XdjbA4L4Jk46E6gQfwDkzZ5Tx7zxt6X26K4fcN6XabqUSW3lfIHJKfdUmPKO2royL7bhTX04.6PrCKXirYdhMDexjcJvw5S5xNFSWKNROB1nwavTn0PgXcf4084WNrbkBsjeRE2ySp1ZSu1z7iST9SYXsXc1C9Yt8WoNXcNpBTZALkGrgBS1Kq9rsNZoFC.VdxjDhju38i3INEyyDR2e9OKVaZrze_.3e8Wy6m1p3lSTjcYGhl8_ipuoGCFKrY2PZJ.C5lfv5VtRAVtVcEpBc5chAfVKM4MshPynNO_NKSojadg0YNSfniDDzckDMZGS0Y4SWKHSbLSTYdRIQNCt.Q_dSTfINuiZsvwvZTPtjyw9WRWG8hw0P3ugaU8nLFsYtVJ1Obr4CNxsV6VShcb38dqbizwfD2Pd8L8uY.zQC05dGLuLvd9Kg8ZRlVboQcJpVxEeVOU45HAhFTUdYu6raPN.Rrqmvjg_5WONuRsIC5oKkxNTDJVozFZYlfDIEXoVz1XGtrnPiTzsw0bxtJy8cK6bg5tHYWojRTQn6C_t4SIWc_uXPS_1owbiVx.vh42LreiWVwwrSFYSdXDk7J_pC3Cp.mQFQiYpv3zG620CBFbBkJ9NAlGuIuS3N_qAgsLKBTDde7I9t5F9hlWbxDx7fDSmZdZp_xmsIS9ATXVC0Et8Wly6VTjaakQtyDCu4409BJygRj.zIvxXreXB3SUikVTlsmZhu6tRjxMe265DWaq0KOs"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd5ba0eca2d62f';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\/5062891437?__cf_chl_rt_tk=CdLrpRpgFW2U27yukzrSRrZ4LLyx3PbKVhpEUaflxOM-1739203707-1.0.1.1-yxSFFn877kKTr4mP8IUW5.q5z0W7kcgxlVSEnLvCDww" + 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