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-4390218567-gov.caltech-edu.pp.ua/post/4390218567

  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-4390218567-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90faf16a891605df',cH: '.945NpwAn9.iObe0xj5AdP6.prBe6c8eyD_khdUTMkE-1739178385-1.2.1.1-07dp.KGseVc.g2mte5pMexYtHGGzkazHlf1Pp9Y..AVVTmHqGAD1M4cTE4svjlvc',cUPMDTk: "\/post\/4390218567?__cf_chl_tk=ikcPmmuxI_HrmE5xp7UMlt9XISlBlhPOI7CKsVYc768-1739178385-1.0.1.1-C94funuEBwZRFLGxQzaUOC3dF2tcCB1BWVmB6HEN3TE",cFPWv: 'g',cITimeS: '1739178385',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4390218567?__cf_chl_f_tk=ikcPmmuxI_HrmE5xp7UMlt9XISlBlhPOI7CKsVYc768-1739178385-1.0.1.1-C94funuEBwZRFLGxQzaUOC3dF2tcCB1BWVmB6HEN3TE",md: "RqFEkdTS4Zci7Q3khiZFdyUCecgM2QdYkUI_B.TaQNw-1739178385-1.2.1.1-2fynbK9W4ZJAnDUBNzp5AOGgY.NhsKNa3KTQhxJuUtKj1mbI8TqByee5yWImTJSwRSOsOeJtjwAcyvJ6JajakN0a_1fpYSXVXsr1lct2fW2VtJ7Nz__L6xGVxkSIhYuJeCKkXZy8BN_bAtozBUS0skUOEwhl6ksW65bM6nJvT3Qxgj6T2MC3A5sFv3LRI2kWW1DtYJCNJC20DdpJvLDIkHGEuhb3VmDM5JnKOl1q.WlMcrRuXTmKDrbw6ZElUKLnXNXqM.4Xw2msTPck.TVtaqh6g9VQntbZv4j1IfFAE7hx7xb_CXeE9uFKExQ8wltATFj.yITgiI.eGV1GLQMsWlFxweHBYQQGaGiFAwIHT9Rpm0NFKFTyERM2k1c1MoXr1cBFov9xmw8S8VbCuPNIReI01JU9TCfDCHwU.zP6P16kROgrjtP7YTJUJYkUmPO7kxfLsEp4bbbEd9Y.LJb2Bf8TGBsjr2HWFL1pFfqKJsCLA7Fzik7UMGAD6dXGai2nD08VlwhVKKqUKoYUWSIKQjGWlD6SwRDmkZEwes9AxEvuwJLSrHL2yOOvJDGXhO7C2Mxctb1CJAv8CtoHBX_XIk5uHBZlVNd5NVc4237V_k4kSgA4FtfOv.ZHqoto0_Jg0TkbzrXN1kxD.Q6FTpGfPMNzZ2OjbHa8El86A5x.J7NEQJRwfc9sdA8rsw3eUwKpFuiGut24WS992wANCRP1cU1mr6Wk.KQrBXr.rNNJfFPn4ZbFk21jjsuTcCcM1nPBUESG9FjFtxUy7MHbJxS6HodCHAjWEXKT0h6jC0OXqUCPFSww6Q40sXHBtgboDU5cdTPdz_WadxDl8utwqERkpwPKRwYG8f0JMmC_T5e3HqVxiDDQt7kOk.n74yDXCu419xJRXxAH0LSiJP2z7LIz7VmMUoeq1Y_uuqGEN4G8fpeQiga.bV1yjwW0K.lBhauA965JvhHqJn5Tby5dbFo7K2I_JHFGrnnWmaY7ETY..8JJyBsI365T6HMjGShLt05GBlh_v2BIi1314wh9CSIFkguyko2hWOI8pd37mYbdZBTPRaK857R2LSykPXu7.sAVopbfwgEyHUrSD7VFG18U7LJYcE3vBK3tmVkzx8_8MCGij_nkRN_a8BFq.3TW5N1_EN3bTS17rMBxmS07FK_mSSEUmUaSMbquNatmUwo1hn4J16zB8OUrvtIU0H_t6GJBQSjQeAj00t7NqAjqB5oq6Ub8h78egI0cXTBVaLOk0ZNN4evjnWp.E.IZsj.lqj_lfCHCgMlQmbiW7xht5vq7g9E8exIY.SNT5WW0mbqq8Xc1IDW6GdCOhg7RAoKn9hPkKeOMVqSpOzvvNCEDI8XizlV2yWj0XMlU_nACO73WokFrgkOkJ8IJRGM1EA7j._U6NUvx0AG8H9WS30KlvgouRvbtnJWqOQZ6p7iTyBbEIb51M8rQbyuMes1zFUBojxgNgFPBOMJESSt4WABg8vBNV._V1Twmx2oAVocJmt91KfHx0qihJep2sj0hMss3A1IPDEBvKZHOOEDpbdLyN6oxH7vf_jCJIVg0PhGhxdLxW5.uKhAPY.16kssDhdCTv4DVBs9Gg6weXm6xu.Gcs45MdUV5poCDbdkqsOxakwj9_jGhOhYjgxWlac8AYBaf1CwsjAxn4orc_nUDmXZHFI_cCQ4XTds2F5prX38XgBwYMRU.EcJjPpRxF6197_6RWPMUXN7YtkVCawrFur.1UounBFbNBCPaNxP8x1JBXIxIjnfNGg4gqtq7RGYPhQQfEhgEnhZ4Q0UbYh2DTuKglirsaks54m2.QmassXmGq_rDM2z5WG02QqUv.ETyToOfbFZJ0hMG9fTxNNP_jxLSDf52kklkXx4iLId4Ys4YWQ3Ndscx1qNbWC5g35uYbA6EzuVRbGGksU_WNyW_HW_xnvUWDTYvBH6IpE9HXYSFkzkTodjTeEDWhnqEWnBwu_012Wc1H_yWGbqPp_Nwd_EfLb1n3sI3iwiRygNgqKL_TY4bbb0HiCYJGPTiQ7cYuGDHRElqXcjgz4IsVa1C55HIQLkgEHdoPl2DDQ0okYMdErrwLmAfYHls4lGqqQrESUe4zQXd_i5GxU6JRix0nJ4RlEaGlqJh25WWQbzLqSbu01ca0_X1AVA0UFvSCDjCEH6Iv5XurTRc3FRYEfFjp.Gk5x2T6uBPeEaXkIX.9ByC6UMl8HrdHC2KJ_LU.jQHCMNjg0AIopn5oBq3hHPso6_gcD9WAA",mdrd: "nf2Ehagb.ckAHX_tnzye9L0YVXkeZIAAj.psFPtb0z4-1739178385-1.2.1.1-84Ac7VS7pvPnybFZFs2PFMGI78JoHhPSyBb3Y_A9zlJhHbHPCYIPDLdY1lRrnrxf.x6JQehL8vKVYzZDPBPYDXbeAVPy8R5CRDSUPMeYYLYjC.6DFQzN8fa12.63Nqqk6gBX4rTWqjNaY._2WNe4lS5U_sY4PzUQD_qqxxjy5Mu3Cu7J9YUl.kaO1bt1DN9s3T1uI3fmaxwcnQdudXOLEuH9utqq.gKCSGX6j97hpySAZmADyxehZEgOXPCp81iu_314fGkchUqC2yCE3Vd7cmjMfw31eNz3ZEBq7VvgFCzlmfFDM_MgfMr8plxyB1lSgW3llFeKJmcs1HM_Zsp0nYWZO5MAdhK0vJHbtcRUEkXo_c2aEkWo.jDvKi27THJihGsmTQqKNV6qX6Z5cglsczPfQSzJJ1axaoShNvAalQnUn0wY3_x61y1G4kaOOQSTLW_OtJVzXk_nAxMcwVHz5nusFzsg8b15.9PKf9045wlMrKw16zc3HRcVMR.D7M0BU1AlmpdceAuj97TZCXO21HkCITPquwA4vWoRG8GAO8OhzkyYd0lhhEVbJNWV7xcy4.NUGrvOj6GtrSjJmGJmtKqzGgt5JlJHWb9TJy15VJfdYNA6RY2hnie9fikdoPws1HRhOMR6Kuc2TPB5hWVUhOFJtuvJ4gAFVGcXys9EDmOfaWYvupc.APQcHKtgz25FoXxZy03X2_NNnyujP8M65ZAHFp7IOmppeagTWvcyGj8.xwdwTdTtU.aL7Hn_gnDpBs6CIM.MFjjinR2oPFsnqnU6Qgw4YP9oSvtoJBuVj6P_qew_MQZMtEr.AxHbZRqEYYaQ1TWx1AmXk0xebGccJuQh3k_ltS4vO3EaVuxaTr6oJN7QAFlWtfnVJ_9k90hAwYjvvT1F3p5E3IMfCZ8jwNyT0o0q7xO0TuK7vBSMdSOzJbHGDa12cJB4V77b_MoYiGJ9vL30NiCY3mdcecCmYutFDWXaiPATyB4dMeEYFr3e97Y4zAWqydzs1CSYhEvI2Sxggd2Gv_ju8pPGFGS96DVbbJJO13dzkE7qpZtxLG_c1BHwBk3dpT8fh.mDjGQrqQK29fJw1zT.duRDSlz.43TnGTwkz.bCzGyCX64p0ImuLnqWVs59SPIU_7RIm0L0vkzY7Smh9PCRf2ISjWdHV7fCic7QAMaHYOYOlz4JYwsW1_gmXTHIMbaavWMyhs8wRE8QsUeZ.k1iSBOcQBs528b61_h9bTx7oy7OONlttYKDRR9TcHM.ipMW6d4bcPDPmVSxMoSop_AZlf8ckpwGuZI_ANdtFkmVfAF9Bnc10Zw7MRuSl6oFTUbzgvICrYTPBLjZdRZnzkM50Pw5UQaxNJW0yA9DYicTLN2sO2SFM1WAfg0s.j..epZng.9Ajs.6.1Qrxr_Mxo1m_4lmc.FYRFD0VqO4LDsr0f8LvsIU5zE317zJlNIsbNuJgkSe5GsfuSIqRvAcBCmRsfB9ygwICaImBS2ax.yePiml1LjYt.ZTs.c1Q7.KHIyCR8gMM7oTYFlDGejmVZSVdkIm3bgJ5DugiBbBnVNrZntKSjXeaibSqZ.7quq6DGuNxtuufWdqPSbLHpx6GGddUb7bHSqdtH2uLRAtMk3vZXicjFDNNJx5hLTwOWCjuo5iHRUjowE8177JQGheX9qvjIW9GX9Dwd6MOl04G4co_YZzRwB4EDhaRE_Vk9P1a7vV4PnS8xhkTzF4omzQfE7lxTUl76NFKArgoD9fmRsgDmIUXn1nd3j87BshfeaLBRKi_VedmJs.Ey7T7O._c.oVHJnm18H.PE1lOPw8lFS..EkPyeajYlXAcMflhEgJf7UNPMgT1n6n"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90faf16a891605df';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\/4390218567?__cf_chl_rt_tk=ikcPmmuxI_HrmE5xp7UMlt9XISlBlhPOI7CKsVYc768-1739178385-1.0.1.1-C94funuEBwZRFLGxQzaUOC3dF2tcCB1BWVmB6HEN3TE" + 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