{"id":15715,"date":"2026-09-06T10:40:12","date_gmt":"2026-09-06T08:40:12","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/toolbox\/rss-atom-feed-checker\/"},"modified":"2026-09-06T10:40:12","modified_gmt":"2026-09-06T08:40:12","slug":"rss-atom-feed-checker","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/rss-atom-feed-checker\/","title":{"rendered":"RSS &#038; Atom Feed Checker: findable, well-formed and alive?"},"content":{"rendered":"<div class=\"gtm-analyser-container\" style=\"background: var(--bg-panel, #1e1e24); padding: 25px; border-radius: 8px; border: 1px solid var(--border, #2a2a35);\">\n<p style=\"color: var(--text-secondary, #a0a0b0); margin-bottom: 20px;\">A feed is the one part of a site that other programs read directly. That makes it unusually unforgiving: a single unescaped ampersand and a reader stops mid-file. This check reads the feed links from the page, fetches them and reads back what a reader actually needs.<\/p>\n<div style=\"margin-bottom: 14px;\">\n        <label for=\"feed-url\" style=\"color: var(--text-secondary, #a0a0b0); display: block; font-size: 0.85rem; margin-bottom: 5px;\">Page address<\/label><br \/>\n        <input id=\"feed-url\" type=\"text\" value=\"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/\" class=\"form-control\" style=\"width: 100%; padding: 10px; background: var(--bg-body, #14141a); border: 1px solid var(--border, #2a2a35); color: var(--text-primary, #e8e8ee); border-radius: 6px; box-sizing: border-box; font-family: monospace;\">\n    <\/div>\n<p style=\"color: var(--text-secondary, #a0a0b0); font-size: 0.82rem; margin-bottom: 16px;\">From this server: one request for the page and up to three for feeds, each capped at 1 MB. No cookies are sent, no scripts are executed, nothing is stored beyond the rate counter.<\/p>\n<p>    <button id=\"feed-btn\" class=\"button\" style=\"background: var(--accent, #7ee787); color: var(--on-accent, #0b1114); border: none; padding: 12px 24px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Check feeds<\/button><\/p>\n<div id=\"feed-ausgabe\" style=\"margin-top: 22px;\"><\/div>\n<p style=\"color: var(--text-secondary, #a0a0b0); font-size: 0.8rem; margin: 24px 0 0;\">Limits worth knowing: only feeds linked in the served HTML are followed. When none are linked, \/feed\/ and \/rss.xml are tried \u2014 a site using another path will be reported as having no feed, which is exactly what a reader would conclude.<\/p>\n<\/div>\n<p><script>\n(function () {\n    'use strict';<\/p>\n<p>    const T = {\"einleitung\":\"A feed is the one part of a site that other programs read directly. That makes it unusually unforgiving: a single unescaped ampersand and a reader stops mid-file. This check reads the feed links from the page, fetches them and reads back what a reader actually needs.\",\"label_url\":\"Page address\",\"datenschutz\":\"From this server: one request for the page and up to three for feeds, each capped at 1 MB. No cookies are sent, no scripts are executed, nothing is stored beyond the rate counter.\",\"knopf\":\"Check feeds\",\"laeuft\":\"Fetching page and feeds...\",\"grenze\":\"Limits worth knowing: only feeds linked in the served HTML are followed. When none are linked, \\\/feed\\\/ and \\\/rss.xml are tried \u2014 a site using another path will be reported as having no feed, which is exactly what a reader would conclude.\",\"h_feeds\":\"Feeds checked\",\"tabelle_hinweis\":\"Found says whether the feed was linked in the page or only guessed at a common path. Kind is what the XML turns out to be, not what the link claimed.\",\"h_befunde\":\"Findings\",\"sp_feed\":\"Feed\",\"sp_gefunden\":\"Found\",\"sp_status\":\"Status\",\"sp_typ\":\"Content type\",\"sp_art\":\"Kind\",\"sp_eintraege\":\"Entries\",\"zeile_seite\":\"Page\",\"zeile_verlinkt\":\"Feeds linked in the page\",\"zeile_dauer\":\"Took\",\"zeile_limit\":\"Checks left this hour\",\"wert_fehlt\":\"missing\",\"wert_verlinkt\":\"linked\",\"wert_geraten\":\"guessed\",\"stufe_hoch\":\"High\",\"stufe_mittel\":\"Medium\",\"stufe_niedrig\":\"Low\",\"stufe_info\":\"Information\",\"stufe_gut\":\"In order\",\"keine_befunde\":\"Nothing to report.\",\"urteil_gut\":\"The feed is findable and sound.\",\"urteil_warnung\":\"The feed works, but something about it will annoy a reader.\",\"urteil_kritisch\":\"The feed cannot be read, or the address does not deliver one.\",\"fehler_kein_token\":\"The check could not be started because reCAPTCHA did not load.\",\"fehler_captcha\":\"reCAPTCHA classified the request as automated. Reloading the page normally helps.\",\"fehler_zu_viele\":\"The limit of {limit} checks per hour for this address has been reached.\",\"fehler_adresse\":\"That address cannot be used.\",\"fehler_abruf\":\"The page could not be fetched.\",\"fehler_zaehler\":\"The rate counter is unavailable, so nothing was checked.\",\"fehler_pruefdienst\":\"The reCAPTCHA service could not be reached.\",\"fehler_aufbau\":\"The service is not configured correctly. The fault is on this side.\",\"fehler_eingabe\":\"The request could not be read.\",\"fehler_methode\":\"Wrong request method.\",\"fehler_netz\":\"The service could not be reached.\",\"fehler_antwort\":\"The answer could not be read.\",\"fehler_unbekannt\":\"Something went wrong that has no message of its own.\",\"grund_leer\":\"Nothing was entered.\",\"grund_zu_lang\":\"The input is too long.\",\"grund_unlesbar\":\"It does not parse as an address.\",\"grund_schema\":\"Only http and https addresses are checked.\",\"grund_benutzerinfo\":\"Inputs with credentials in them are refused.\",\"grund_kein_punkt\":\"The host name needs at least one dot.\",\"grund_hostform\":\"A host name is expected, not an IP address.\",\"grund_port\":\"Only the ports 80, 443, 8080 and 8443 are checked.\",\"grund_gesperrter_bereich\":\"That host resolves into a private or reserved network. Those are never fetched.\",\"grund_kein_dns\":\"The host name does not resolve.\",\"grund_abruf\":\"The address did not answer.\",\"grund_zu_viele_spruenge\":\"The address redirects too often.\",\"befund_status\":\"The page answered with status {status} || Feed links were still read from whatever body came back.\",\"befund_feed_unerreichbar\":\"A linked feed could not be fetched || {url}, reason: {grund}. The page points at it, so readers try it and fail.\",\"befund_feed_status\":\"A linked feed answers with status {status} || {url}. The link is in the page but there is nothing behind it.\",\"befund_feed_zu_gross\":\"A feed is larger than {kb} KB || {url}. It was not parsed. Feeds that large usually carry the full text of every post ever written; most readers only need the newest entries.\",\"befund_nicht_wohlgeformt\":\"A feed is not well-formed XML || {url}, line {zeile}: {meldung}. Readers stop at that point \u2014 an unescaped ampersand or a stray control character is enough. Nothing after it is read.\",\"befund_kein_feed\":\"The address does not deliver a feed || {url} parses as XML, but its root element is {wurzel}. Something else lives there.\",\"befund_feed_unlesbar\":\"A feed could not be read || {url}, reason: {grund}\",\"befund_feed_nicht_verlinkt\":\"A feed exists at {url} but is not linked in the page || It answers, and it is a valid {art} feed. Without a link element in the head, readers cannot discover it \u2014 only someone who already knows the address will find it.\",\"befund_ohne_content_type\":\"The feed comes without a content type || {url}. Readers then guess, and some guess wrong.\",\"befund_falscher_content_type\":\"The feed is delivered as {typ} || {url}. application\\\/rss+xml or application\\\/atom+xml is what readers expect; text\\\/plain or text\\\/html makes some of them refuse it.\",\"befund_feed_als_html\":\"The feed is delivered as text\\\/html || {url}. Browsers will render it, readers will refuse it.\",\"befund_ohne_titel\":\"The feed has no title || {url}. It then appears in a reader under its address.\",\"befund_ohne_selbstverweis\":\"The feed carries no self link || {url}. A {art} feed should name its own address, so a copy passed around still points home. It is a single line and it is missing surprisingly often.\",\"befund_selbstverweis_abweichend\":\"The self link points elsewhere || Declared: {gemeldet}, fetched from: {geholt}. Readers that follow the declared address may end up subscribing to a different feed.\",\"befund_ohne_eintraege\":\"The feed has no entries || {url}. Valid, and useless: a reader has nothing to show and may drop the subscription.\",\"befund_eintraege\":\"{n} entries in the {art} feed || {url}\",\"befund_eintraege_ohne_datum\":\"{n} of {gesamt} entries have no readable date || Readers sort by date. Entries without one land wherever the reader decides to put them, often at the top forever.\",\"befund_eintraege_ohne_link\":\"{n} entries have no address || The entry can be read in the reader, but there is no way back to the site.\",\"befund_eintraege_ohne_titel\":\"{n} entries have no title || Readers show the first words of the text instead.\",\"befund_relative_links\":\"{n} entries use relative addresses || A feed is read outside the site, so a relative address has no base to resolve against. Some readers guess, most simply fail.\",\"befund_feed_eingeschlafen\":\"The newest entry is {tage} days old || Not a defect, but readers rank a dormant feed lower and some stop polling it.\",\"befund_feed_frisch\":\"The newest entry is {tage} day(s) old || The feed is being kept up.\",\"befund_ohne_aktualisierungsdatum\":\"The feed carries no update date || A {art} feed can state when it last changed. Without it, readers have to compare entries to notice anything new.\",\"befund_inhaltslaenge\":\"Entries carry {zeichen} characters on average || Whether that is a summary or the full text is a decision, not a defect.\",\"befund_kein_feed_gefunden\":\"No feed found || Neither linked in the page nor at {pfade}. If one exists elsewhere, readers will not find it either.\",\"befund_feed_verlinkt\":\"{n} feed(s) linked in the page || Readers and browsers discover them automatically.\",\"befund_nur_stichprobe\":\"{gesamt} feeds are linked, the first {n} were checked || A sample keeps the load on the checked server small.\"};<\/p>\n<p>    var ENDPUNKT = '\/lw-feedcheck.php';\n    var SITEKEY = '6LcrPkEtAAAAAPo1QCOf-IIM2fCL0UfdJz4y2iSY';\n    var STUFEN = ['hoch', 'mittel', 'niedrig', 'info', 'gut'];<\/p>\n<p>    function liste(w) { return Array.isArray(w) ? w : []; }\n    function zahl(w) { return (typeof w === 'number' && isFinite(w)) ? w : null; }\n    function zeichen(w) { return (typeof w === 'string' && w !== '') ? w : null; }\n    function text(schluessel, daten) {\n        var t = T[schluessel];\n        if (typeof t !== 'string') { return null; }\n        return t.replace(\/\\{([a-z_0-9]+)\\}\/g, function (m, k) {\n            return (daten && daten[k] !== undefined && daten[k] !== null) ? String(daten[k]) : m;\n        });\n    }\n    \/** Adresse auf das kuerzen, was in einer Tabellenzelle lesbar bleibt. *\/\n    function kurz(url) {\n        var s = String(url || '');\n        s = s.replace(\/^https?:\\\/\\\/\/, '');\n        if (s.length <= 52) { return s; }\n        return s.slice(0, 24) + '\u2026' + s.slice(-26);\n    }\n\n    function bewerten(antwort) {\n        var a = antwort || {};\n        if (a.fehler) { return { fehler: String(a.fehler), grund: a.grund || null, limit: zahl(a.limit) }; }\n        var befunde = liste(a.befunde).map(function (f) {\n            return { key: String(f.key || ''), stufe: STUFEN.indexOf(f.stufe) === -1 ? 'info' : f.stufe, daten: (f.daten &#038;&#038; typeof f.daten === 'object') ? f.daten : {} };\n        });\n        var gruppen = {};\n        STUFEN.forEach(function (s) { gruppen[s] = befunde.filter(function (f) { return f.stufe === s; }); });\n        var feeds = liste(a.feeds).map(function (z) {\n            return { url: String(z.url || ''), geraten: z.geraten === true, status: zahl(z.status),\n                typ: zeichen(z.typ), art: zeichen(z.art), eintraege: zahl(z.eintraege), kb: zahl(z.kb) };\n        });\n        return {\n            fehler: null, url: String(a.url || ''), endurl: String(a.endurl || ''),\n            urteil: (a.urteil === 'gut' || a.urteil === 'warnung' || a.urteil === 'kritisch') ? a.urteil : 'kritisch',\n            verlinkt: zahl(a.verlinkt), feeds: feeds,\n            befunde: befunde, gruppen: gruppen, dauer: zahl(a.dauer_ms), limitRest: zahl(a.limit_rest)\n        };\n    }\n\n    function skriptLaden() {\n        return new Promise(function (auf) {\n            if (window.grecaptcha) { auf(true); return; }\n            var s = document.createElement('script');\n            s.src = 'https:\/\/www.google.com\/recaptcha\/api.js?render=' + SITEKEY;\n            s.onload = function () { auf(true); }; s.onerror = function () { auf(false); };\n            document.head.appendChild(s);\n            setTimeout(function () { auf(!!window.grecaptcha); }, 8000);\n        });\n    }\n    function tokenHolen() {\n        return skriptLaden().then(function (da) {\n            if (!da || !window.grecaptcha || !window.grecaptcha.ready) { return null; }\n            return new Promise(function (auf) {\n                var fertig = false;\n                function einmal(w) { if (!fertig) { fertig = true; auf(w); } }\n                setTimeout(function () { einmal(null); }, 12000);\n                try {\n                    window.grecaptcha.ready(function () {\n                        if (fertig) { return; }\n                        if (!window.grecaptcha.execute) { einmal(null); return; }\n                        window.grecaptcha.execute(SITEKEY, { action: 'feedcheck' }).then(function (t) { einmal(t || null); }, function () { einmal(null); });\n                    });\n                } catch (e) { einmal(null); }\n            });\n        }, function () { return null; });\n    }\n    function abfragen(url) {\n        return tokenHolen().then(function (token) {\n            return fetch(ENDPUNKT, { method: 'POST', headers: { 'Content-Type': 'application\/json' }, body: JSON.stringify({ url: url, token: token || '' }) })\n                .then(function (r) { return r.json().then(function (j) { return j; }, function () { return { fehler: 'antwort' }; }); }, function () { return { fehler: 'netz' }; });\n        });\n    }\n\n    window.LW_TEST = window.LW_TEST || {};\n    window.LW_TEST.FEED = { bewerten: bewerten, darstellen: null, text: text, kurz: kurz, ENDPUNKT: ENDPUNKT, STUFEN: STUFEN, T: T };\n\n    var btn = document.getElementById('feed-btn');\n    var out = document.getElementById('feed-ausgabe');\n    if (!btn || !out) { return; }\n\n    function el(tag, stil, txt) { var e = document.createElement(tag); if (stil) { e.setAttribute('style', stil); } if (txt !== undefined &#038;&#038; txt !== null) { e.textContent = txt; } return e; }\n    function wert(id) { var e = document.getElementById(id); return e ? e.value : ''; }\n    var UEBERSCHRIFT = 'font-family: \"Nunito Sans\", sans-serif; font-weight: 700; color: var(--text-primary, #e8e8ee); font-size: 0.95rem; margin: 22px 0 8px;';\n    var ZELLE = 'padding: 5px 12px 5px 0; color: var(--text-secondary, #a0a0b0); font-size: 0.87rem;';\n    var ZELLE_WERT = 'padding: 5px 12px 5px 0; color: var(--text-primary, #e8e8ee); font-size: 0.87rem; font-family: monospace; word-break: break-all;';\n    var KASTEN = 'background: var(--bg-body, #14141a); border: 1px solid var(--border, #2a2a35); border-radius: 8px; padding: 14px 16px; margin: 0 0 10px;';\n    var GUT = ' color: #7ee787;', WARN = ' color: #ffa94d;', ROT = ' color: #ff7b72;', GRAU = ' color: #8a8a99;';\n    var FARBEN = { hoch: '#ff7b72', mittel: '#ffa94d', niedrig: '#e3b341', info: '#8a8a99', gut: '#7ee787' };\n    var URTEIL = { gut: GUT, warnung: WARN, kritisch: ROT };\n    function gitter(sp) { return el('div', 'display: grid; grid-template-columns: ' + sp + '; gap: 0 18px; align-items: baseline;'); }\n    function paar(g, n, w, stil) { g.appendChild(el('div', ZELLE, n)); g.appendChild(el('div', ZELLE_WERT + (stil || ''), w)); }\n\n    function tabelle(b) {\n        var huelle = el('div', 'overflow-x: auto; margin: 0 0 6px;');\n        var t = el('table', 'border-collapse: collapse; width: 100%; min-width: 620px; font-size: 0.84rem;');\n        var kopf = el('tr', '');\n        [T.sp_feed, T.sp_gefunden, T.sp_status, T.sp_typ, T.sp_art, T.sp_eintraege].forEach(function (n) {\n            kopf.appendChild(el('th', 'text-align: left; padding: 6px 12px 6px 0; color: #8a8a99; font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.4px; border-bottom: 1px solid var(--border, #2a2a35); white-space: nowrap;', n));\n        });\n        t.appendChild(kopf);\n        b.feeds.forEach(function (z) {\n            var r = el('tr', '');\n            function zelle(txt, stil) { r.appendChild(el('td', 'padding: 7px 12px 7px 0; border-bottom: 1px solid var(--border, #2a2a35); font-family: monospace; color: var(--text-primary, #e8e8ee);' + (stil || ''), txt)); }\n            zelle(kurz(z.url), ' word-break: break-all;');\n            zelle(z.geraten ? T.wert_geraten : T.wert_verlinkt, z.geraten ? WARN : GUT);\n            zelle(z.status !== null ? String(z.status) : T.wert_fehlt, z.status === 200 ? GUT : ROT);\n            zelle(z.typ || '-', GRAU);\n            zelle(z.art || '-', z.art ? GRAU : WARN);\n            zelle(z.eintraege !== null ? String(z.eintraege) : '-', GRAU);\n            t.appendChild(r);\n        });\n        huelle.appendChild(t);\n        return huelle;\n    }\n\n    function darstellen(b, ziel) {\n        ziel.innerHTML = '';\n        if (b.fehler) {\n            var txt = T['fehler_' + b.fehler] || T.fehler_unbekannt;\n            if (b.grund &#038;&#038; T['grund_' + b.grund]) { txt = txt + ' ' + T['grund_' + b.grund]; }\n            if (b.limit !== null) { txt = txt.replace('{limit}', String(b.limit)); }\n            ziel.appendChild(el('p', ZELLE + WARN + ' margin: 0;', txt));\n            return;\n        }\n        ziel.appendChild(el('div', 'font-size: 1.05rem; font-weight: 700; margin: 0 0 12px;' + URTEIL[b.urteil], T['urteil_' + b.urteil]));\n\n        var g = gitter('auto auto');\n        paar(g, T.zeile_seite, b.endurl || b.url, GRAU);\n        paar(g, T.zeile_verlinkt, String(b.verlinkt !== null ? b.verlinkt : '-'), b.verlinkt ? 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When no feed is linked, two common paths are tried \u2014 a feed nobody links to is practically invisible.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":38,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"tags":[92735,91094,92757],"class_list":["post-15715","page","type-page","status-publish","hentry","tag-content","tag-seo","tag-web-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RSS &amp; Atom Feed Checker: findable, well-formed and alive? - Lukas Wojcik - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/rss-atom-feed-checker\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RSS &amp; Atom Feed Checker: findable, well-formed and alive? - Lukas Wojcik - Blog\" \/>\n<meta property=\"og:description\" content=\"Reads the feed links from a page, fetches them and checks what a feed reader needs: well-formed XML, a content type nobody has to guess, entries with an address and a date, and a self link so the feed knows where it lives. 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