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-4815793026-gov.caltech-edu.pp.ua/post/4815793026

  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-4815793026-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fdae9dee08d638',cH: 'o5IzwiU4.ZfBUGiMgeOEGNVIp.sco_QERGufMg9rizA-1739207106-1.2.1.1-jmw92JEBrenEynQ_asIoIOeVMbCnNObCg2oAsy3vv1sPwCv3PGFroY.X44yR31L2',cUPMDTk: "\/post\/4815793026?__cf_chl_tk=dVE2j1_1siEuWIBxB_egIStC1UoJEf0kX7qa.Q3_VY8-1739207106-1.0.1.1-DGQay.dYeqiDXYsCcLLTUjNVSw1U26urGKBg_Kb_bQA",cFPWv: 'g',cITimeS: '1739207106',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4815793026?__cf_chl_f_tk=dVE2j1_1siEuWIBxB_egIStC1UoJEf0kX7qa.Q3_VY8-1739207106-1.0.1.1-DGQay.dYeqiDXYsCcLLTUjNVSw1U26urGKBg_Kb_bQA",md: "NDfJJ6CKXwjQjl7Z2oK4eE847GR5iMWAIMpTLzhxTS4-1739207106-1.2.1.1-ZcFBoHewIPEd1c.vi5Bh2G1yjuc6ZSQuFCk3LCLRV8sFpMuLO4Qwig3iu7XIwMZivY2a3nfsmZ8kvY4Q_rN8UzJHvl907B7M2uLLBwbLBZJ5Ek.EjI_9jauUxR4sK0A9bUadebPd2GIUcudmijKDTX1pO8_VIqUmEnAqDIhWRwIFvsIckQka4xLMW1bgWHUEKBIhnrt1VAslN3eIpc4mmlTl4Zt6sMLT95iU1oSErHRnnnTErRXvztT.JMjzPLvdbnnaPTrhPwyuOEnn2KNztScRG.wgRDW.2DKIbdVDLZNodkW_2ky8QmnX0mMKxEBFJSwVconmff6YGUlZ4rcJ_B4XZdWVgys0GtNnFwon4ems8xrGe3gGoc9FRKfnaytyS0GQ5n_Z5ns7JqlySlGHUWDD7K39hf4LmR6lZ5g.bY2sFfAxD2PemfKFeFBIBv0GVaZrEiIrfJa8xxtp8hWKLs6kEPFNERa29WXbaRYlmi8JPIRkHnFPLn371d.isMsfFb.XOYYwlPgFdvAAJhLRN1ukJiM3TISWkN.3dQML_SjVRBT8Nv8N95aiwbHSGJYXdfMfdMebgefY9eM7zK_M8ufgmuTDgr57Nk_w0qoJ4IekD32IlB8541G0.Z.9ZAEb87.LWUMzAG.6bGd5c_QwCmFjR_u1W2AU5L8gh59GcfuoJUsWBVoWmGcmiipo4mSsu49JTyjIe3ol6S3ndJ68taq7FNkHYBMZzY65M8_raTfiZVVQfQcmbuPXCfuRetaMjkfZCeiWQwyP8.8QCN61yhZ5C7vfo8shb10.XxTefDlrjS5I9BqOLOvFYpy16EuKA.3WbtKyNYbUUfXqpW.k_MTH6VkPgIty8PKM6O_HweUtju9xINE930.RWMw7JeuqhAewhgJ68qx5qZGBfAAsY7AwzWwHTnJPdUPdBkQBMJu68TFed0thGoFhXHgVYtCo0CVErwuH_ajGchjpjgR9ELx2zEEharL1vNO0zMucbQKKUChBaIleVv3xSAA7V8qqAva7JGNcgQ9Q6BL.ZEatOhZGdvLiu.O4dp9xdzbUZc8g3Oa7l2m4MBm0tlg68V9dHeeJ7fje0SIjy3hMqSs4A1hCbu9HrjdJP_cQsSPO6KMSqQGvs1kzhBkMYj9OW4zws_R0O_dkbrs3AM6Iazg54W8wIhXaAZyB_t.YEVDwbmFh_lkConzOayrtU7nK.hggLm1mmR5mlobpQftiL.WoqlQag_oyRkAqwEm27ssWRvTLC_kd5eL5N0Ncxjn7GsVNfL7yOAiSuTS_.BVjJcksduLuQVw.NxnV7j9zgMm1fhcffLyIRmXNGwY2Va0JXntrF5rT9vcP8GXFk.xLHtI9RioF37HGhtyR8znWreNdKSfm2RUP1viye3Q.lqRA4tRHlkNKV1tHyie51qsr_Ir0d3nf8w_5WiD.Qc_5TDYEanI5fTgsjVpmTvzKPEAhMsrloH0wI5.6OfVTrnQUCfDVVSqC6OVybGPNQEmP2TKt_tH3TQPdbrjs0kfBMXQU_tLpzmSqEyVca1waXtcslUSJRz9YTzzDMAsEKL_X7UzNzJoTO45pPCgAbP..iiv7nrIoUa66PKmAC6FBZeXvm2w1mWIqwu0Ks1VMqVLRjbs8iI992IWuuhA_zparre9Pl5IQXP24C_VjEnCGn6lbJsRIwO8JzyEZNFIg5L9jQAwHnD421CUOPN1kVOOpiJzYkkktxwHmrqnkoqiU0TqsYw141d63o8whsJ59DMGFv0oV5BXaW36NxO6lBR7NaoFjfgwWDZVGtwibApcIlPLPBKW9J5RJe2pcAlHKCj7IrhClMW2ZbRZ2PWR3aki3tUneughxHWa9igC1mdrGzf01SWl_O1.WsFGQK8C6vZdZrBL7rN5.q8INgc674.lN8dYRZOTA2WCxgxSBfTkaVVBOtoTUE2pKbhWofDZ70m.xt2zxkXRGnY8pJ.OIpeH0ZAnmje_LFC0UfBkHrlUJLDVsz91.rFIz2oCZa03wWeGO4_Fsb0IGO.SykFg6TrikNrr_OjMMERQxg_qwY4rPCyAo.v.JcKdYCT74.yrf6VRzOzIT2m9gVQgHAFKz8IrclXMZSEFYVV9xK0ZtzKx0fvnoIg956lNoSSmH3CrmObDk3FPd6TbJfDTl..B4vBJ9geZiJ_1QrEoXUv.T1TpAraGJjwaevJDyPmg0jIosL4a3zWKzCXjPVvPcaxLm.eHD9447FEq5r5mpRBm_yHPbKapf6Y.TCA",mdrd: "8ny6cTHq0pIUF_4gJ4tWx5nRFGSGOjsDYOnHQWQ8Z9c-1739207106-1.2.1.1-PXIm2L9bT3qZFycfAxgF12JYKPeE7mW9sUK8iqYn47pM1.lCLZThu5zYf8izkWjzAZ7IJKdslQyYQAgn1jaNgzbAYfNyUxwrcpR99nxNJ8R5LW6BPvYBhI3iRRk9niLjfp0sWEhdXk5nBWN__vL4ejY66V3MsZ81.7EjhcInZokoozsnMwzkBle7Wqou0I2t5W7ilhOA7eQvZEGQ8Df4Ko5Zc5EneZCnC1pqq.AjX_cCzCxMfoOmPUvwVPwQioLw2tV1EIT4JshGqo6.ljSLbweDUE_TRlzE5Ac.Eh1u4ujtjwF_X7SrK1vQnrc8hTkVqEZmUMKhgmOY6.g18YWmgNrVWJMLR1JGupEux8pCspGtRQJUaWuCGpTd3yFooIJT7ZwT75ghcQnKTZ7YgqPWRoT0iBH28XOYC5Y17gu.G2cYSfUOYmLHY7e3CLP8lyKYJP7fFdmVUCsOUDi_ggnymCx2YUjecu_xlRSGO1IaqA5NFIMX2e8OB08gEJwUocEJ3nFL4BPbwS7cyLCJvZAAeypRb5jZhErPYJKFma8S0m6Hp4DMN99JTCK64ZtuNuKApT7kgVK8IrlKWcVB7s0l0Q1OV1QUokWZHADIzj25bLSCi982AJ1abO.jz0AdrvXqr89t43REs5St3bZRaoM6WEN98MjC2IqNzPWII.bAPw_zG7diTXpm9gBYbJo7ARae_L6g5M.NNgsQqvha_lcd.WZ0GCkGTu4DJo9Pc.1WrpM7Vz5_h1z0bgpbyUBciIT7GhjlcexDgWb1nzq3W78PXfPcIf40WyKCmNVdYKZql1F0QyBThBS0uwE07xsS0SYCQ3y6V_.a0P1fhQ7Yu_5yuSwUlyOuOa.vjpVLFU7CfgO47EJ8ZbdgJKp8HxW3UiNGGRIUx3ARuJxeDL3iTyp4OTmZB53EMiUls3_46u0lFZw9UGV_otRwCEaNHhJ8ugIlCtcBgsl5wr3qO2aIXQEcw_LFr7H66pFGzqbm6qF40rRi9aR9Mbk2kje1iKqHi2cVQjVy_3xKerYLtZ2VHQZabdByo2RBmgyeGQ8tE_69FGivf6vNDH3CqhJ.YSLPB5xPaDss7.tO405w5McId6cdiku33YFf_Kt_5oagcoTOkCHhDazeof4tMeo2wpjC6x59efoSKi1n2YluVBSlyOx2cmuH9OZYsM9cQO5GvJA_1GT7zKsKqs09Gi3cHyOJy_smttmstqPQSVp_qVmlowUedSI8qIc5BaC5qlaeN88u7Fn3u08_VRUm_S7gO0gIfjwjTicBpwAzDuddQOiDYnFxDCoDazewYRMXbR9GvL4FlvTfj6SR3CUxtGHykL.t2lyE438kqCXiwen000xmqROTcn1tdrmDkKn72ukz10LzwXG50G60NE7LryVzTGay3gC9zecfrBFMow3949hPFQjEluaNSa33iSYlnvL9xAOuTOs6.6Fy9twhCytyATytQshix_mUJjp7Jtr.XG7ZrELt0mqtnl5fsdmEkB1h7cjhQXSOpkGwaYqbEQGfMDqX13svZw6sTJQkk57JyWsEmxqo3zdfyeA7RQ_JlWV4IF8rL67pI8xbdFV4hujGgYEg54jliTnXx52WGs2R50_6P1dsGIwXtS3S7zHlSl40Mfgjwh19bnqdFWYTgoApaVt7NF7V9bXxBSORvZpCuYC_Tt7HifWtzp7HkVeDbzzmQCRMnEKtRsiYnUyqW_tJpWGT1VGw0KfayM5FgXlGxt2FTom0x.PCdZPCPZLx2lpSvoQ8lJ0LCTwI.dNyT1GryaJVx1ll.vRyPX8YqAiXktTF7Se5Mvy7ZxF.ky.Q4qlJC5JA83529Ku63Ml_TRZ5Wkbyy.kE"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fdae9dee08d638';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\/4815793026?__cf_chl_rt_tk=dVE2j1_1siEuWIBxB_egIStC1UoJEf0kX7qa.Q3_VY8-1739207106-1.0.1.1-DGQay.dYeqiDXYsCcLLTUjNVSw1U26urGKBg_Kb_bQA" + 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