{"id":5189,"date":"2026-08-30T09:40:34","date_gmt":"2026-08-30T00:40:34","guid":{"rendered":"https:\/\/donguri3.net\/server-tech\/domain-unify-rss-error-2\/"},"modified":"2026-08-30T09:40:35","modified_gmt":"2026-08-30T00:40:35","slug":"domain-unify-rss-error","status":"publish","type":"post","link":"https:\/\/donguri3.net\/en\/server-tech\/wordpress-blog-seo\/domain-unify-rss-error\/","title":{"rendered":"Domain Review Triggered by an RSS Registration Bug"},"content":{"rendered":"<p>Recently, when trying to register my blog on an iPhone RSS reader app, I ran into an unexpected issue. I&#8217;ve been using <strong data-start=\"267\" data-end=\"290\"><code data-start=\"269\" data-end=\"288\">donguri3.net<\/code><\/strong> as my blog URL, but trying to register the RSS feed with <code data-start=\"310\" data-end=\"342\">https:\/\/donguri3.net\/feed<\/code> resulted in a persistent error.<br data-start=\"369\" data-end=\"372\" \/>On the other hand, when I specified <strong data-start=\"384\" data-end=\"415\"><code data-start=\"386\" data-end=\"413\">https:\/\/donguri3.net\/feed<\/code><\/strong> (which accesses the same articles), it registered successfully right away. While app-specific behaviors play a role, considering which one should be &#8220;official&#8221; prompted me to think that <strong data-start=\"476\" data-end=\"514\">it would be better to unify under the apex domain (donguri3.net)<\/strong>.<\/p>\n<h2 data-start=\"532\" data-end=\"549\">Purpose and Benefits of Domain Unification<\/h2>\n<p>The goal this time is simple: &#8220;ensuring users can access the site without getting lost&#8221; and &#8220;reducing troubleshooting issues with external service integrations.&#8221;<br data-start=\"605\" data-end=\"608\" \/>Especially for features like RSS, where slight behavioral differences can easily occur depending on the user&#8217;s operating environment, consolidating URLs into a single standard is crucial.<br data-start=\"665\" data-end=\"668\" \/>Furthermore, secondary benefits can be expected, such as:<\/p>\n<ul data-start=\"675\" data-end=\"768\">\n<li data-start=\"675\" data-end=\"698\">Preventing search engine SEO equity from being diluted<\/li>\n<li data-start=\"699\" data-end=\"717\">Simplifying SSL certificate management<\/li>\n<li data-start=\"718\" data-end=\"768\">Shorter and more memorable URLs displayed in browsers and apps<br data-start=\"744\" data-end=\"747\" \/><\/li>\n<\/ul>\n<h2 data-start=\"770\" data-end=\"787\">Challenges with Rewrite Rules<\/h2>\n<p>To actually redirect blog. to donguri3.net, you configure the web server&#8217;s rewrite rules. In an environment using OpenLiteSpeed, I added the following rules:<\/p>\n<p># Remove www., blog., or www.blog. and unify to apex<br \/>\nRewriteCond %{HTTP_HOST} ^(?:www.)?(?:blog.)?(.+)$ [NC]<br \/>\nRewriteRule ^(.*)$ https:\/\/%1\/$1 [L,R=301,NC]<\/p>\n<p>With this configuration,<\/p>\n<ul data-start=\"1098\" data-end=\"1234\">\n<li data-start=\"1098\" data-end=\"1120\"><code data-start=\"1100\" data-end=\"1118\">www.donguri3.net<\/code><\/li>\n<li data-start=\"1121\" data-end=\"1144\"><code data-start=\"1123\" data-end=\"1142\">donguri3.net<\/code><\/li>\n<li data-start=\"1145\" data-end=\"1234\"><code data-start=\"1147\" data-end=\"1170\">www.donguri3.net<\/code><br data-start=\"1170\" data-end=\"1173\" \/>accesses will now all be redirected to <strong data-start=\"1186\" data-end=\"1213\"><code data-start=\"1188\" data-end=\"1211\">https:\/\/donguri3.net\/<\/code><\/strong>.<\/li>\n<\/ul>\n<h2 data-start=\"1236\" data-end=\"1280\">ACME Authentication and Handling of <code data-start=\"1247\" data-end=\"1276\">.well-known\/acme-challenge\/<\/code><\/h2>\n<p>However, there was one challenge. The ACME http-01 challenge used for automatic SSL certificate renewal requires access to a special path called <code data-start=\"1332\" data-end=\"1361\">.well-known\/acme-challenge\/<\/code>.<br data-start=\"1386\" data-end=\"1389\" \/>If you apply a blind redirect via rewrite rules, even this path gets a 301 redirect, which risks authentication failure. Therefore, I added the following rule at the very beginning.<\/p>\n<p># Completely bypass ACME challenge<br \/>\nRewriteRule ^.well-known\/acme-challenge\/ &#8211; [L]<\/p>\n<p>This allows access for certificate renewals to be returned as-is without being redirected, ensuring that automated renewals by Let\u2019s Encrypt or ZeroSSL complete without issues.<\/p>\n<h2 data-start=\"1674\" data-end=\"1689\">Key Takeaways from This Response<\/h2>\n<ul data-start=\"1690\" data-end=\"1782\">\n<li data-start=\"1690\" data-end=\"1716\">Successfully avoided RSS reader app registration errors<\/li>\n<li data-start=\"1717\" data-end=\"1751\">Unified domains to the apex, eliminating SEO waste<\/li>\n<li data-start=\"1752\" data-end=\"1782\">Made SSL certificate renewal processing safe to operate<\/li>\n<\/ul>\n<p>As a result, we&#8217;ve established &#8220;unambiguous URLs&#8221; for both users and administrators.<\/p>\n<hr data-start=\"1830\" data-end=\"1833\" \/>\n<h2 data-start=\"1835\" data-end=\"1841\">Conclusion<\/h2>\n<p>It started as a minor issue of &#8220;not being able to register in the RSS reader,&#8221; but looking deeper, it turned out to be <strong data-start=\"1883\" data-end=\"1904\">a great opportunity to clean up domain operations<\/strong>.<br data-start=\"1911\" data-end=\"1914\" \/>How to handle subdomains varies depending on the site&#8217;s circumstances, but when considering integration with external services like RSS and SSL, <strong data-start=\"1970\" data-end=\"1993\">consolidating into an apex domain is the safer bet<\/strong>.<br data-start=\"1996\" data-end=\"1999\" \/>If anyone else is struggling with &#8220;blog.&#8221; or <a class=\"decorated-link cursor-pointer\" target=\"_new\" rel=\"noopener\">&#8220;www.&#8221;, I hope you find the rewrite rule adjustments and<\/a> the exception settings for <code data-start=\"2043\" data-end=\"2072\">.well-known\/acme-challenge\/<\/code> helpful.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently, when trying to register my blog on an iPhone RSS reader app, I ran into an unexpected issue. I&#038;#8217 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"https:\/\/donguri3.net\/?p=2141","footnotes":""},"categories":[1166],"tags":[16,15,14,807,97,61,17,10,130],"class_list":["post-5189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wordpress-blog-seo","tag-lets-encrypt","tag-litespeed","tag-openlitespeed","tag-rss","tag-ssl","tag-wordpress","tag-zerossl","tag-server","tag-130","en-US"],"_links":{"self":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/comments?post=5189"}],"version-history":[{"count":1,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5189\/revisions"}],"predecessor-version":[{"id":5192,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5189\/revisions\/5192"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/media\/2144"}],"wp:attachment":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/media?parent=5189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/categories?post=5189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/tags?post=5189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}