{"result":{"depiction_url":null,"edges":{"in_module":{"objects":[{"created":"2020-05-30T05:47:38Z","object_id":{"id":1754,"is_a":["text","documentation","reference","module"],"name":"doc_module_mod_ssl_letsencrypt","title":"mod_ssl_letsencrypt","uri":"https:\/\/zotonic.com\/id\/1754"},"seq":1000000}],"predicate":{"id":333,"is_a":["meta","predicate"],"name":"in_module","title":{"_type":"trans","tr":{"en":"In module"}},"uri":"https:\/\/zotonic.com\/id\/in_module"}},"relation":{"objects":[{"created":"2020-05-30T05:47:38Z","object_id":{"id":1754,"is_a":["text","documentation","reference","module"],"name":"doc_module_mod_ssl_letsencrypt","title":"mod_ssl_letsencrypt","uri":"https:\/\/zotonic.com\/id\/1754"},"seq":1000000}],"predicate":{"id":303,"is_a":["meta","predicate"],"name":"relation","title":{"_type":"trans","tr":{"nl":"Relatie","en":"Relation"}},"uri":"http:\/\/purl.org\/dc\/terms\/relation"}},"subject":{"objects":[{"created":"2026-09-09T13:47:56Z","object_id":{"id":2555,"is_a":["categorization","keyword","keyword_information_type"],"name":"zotonic_topic_reference","title":"Reference","uri":"https:\/\/zotonic.com\/id\/2555"},"seq":1},{"created":"2026-09-09T13:47:56Z","object_id":{"id":2563,"is_a":["categorization","keyword","keyword_audience"],"name":"zotonic_topic_frontend_developer","title":"Frontend developer","uri":"https:\/\/zotonic.com\/id\/2563"},"seq":2},{"created":"2026-09-09T13:47:56Z","object_id":{"id":2621,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_template_filter","title":"Template filter","uri":"https:\/\/zotonic.com\/id\/2621"},"seq":3},{"created":"2026-09-09T13:47:56Z","object_id":{"id":2640,"is_a":["categorization","keyword","keyword_task"],"name":"zotonic_topic_validate","title":"Validate","uri":"https:\/\/zotonic.com\/id\/2640"},"seq":4},{"created":"2026-09-09T13:47:56Z","object_id":{"id":2682,"is_a":["categorization","keyword","keyword_technology"],"name":"zotonic_topic_tls_and_certificates","title":"TLS and certificates","uri":"https:\/\/zotonic.com\/id\/2682"},"seq":5}],"predicate":{"id":308,"is_a":["meta","predicate"],"name":"subject","title":{"_type":"trans","tr":{"en":"Keyword"}},"uri":"http:\/\/purl.org\/dc\/elements\/1.1\/subject"}}},"id":1830,"is_a":["text","documentation","reference","template_filter"],"links":[{"rel":"self","target":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/1830"},{"rel":"hub","target":"https:\/\/zotonic.com\/.zotonic\/websub"}],"medium":null,"medium_url":null,"name":"doc_template_filter_filter_is_letsencrypt_valid_hostname","page_url":{"en":"https:\/\/zotonic.com\/docs\/1830\/is_letsencrypt_valid_hostname","x-default":"https:\/\/zotonic.com\/docs\/1830\/is_letsencrypt_valid_hostname"},"preview_url":null,"resource":{"version":4048,"pivot_location_lat":null,"title":"is_letsencrypt_valid_hostname","is_authoritative":true,"body":"<p>Test if a hostname can be used for a Let’s Encrypt certificate.<\/p>\n<p>Criteria are:<\/p>\n<ol><li>Does resolve using DNS<\/li><li>The resolved address is not a LAN address<\/li><li>The address is reachable<\/li><li>And the current site is listening for the hostname on that address<\/li><\/ol>\n<p>The site must listen on port 80 for connections.<\/p>\n<p>For example, check if the current site is reachable as <em>example.com<\/em>:<\/p>\n<pre class=\"notranslate\"><code class=\"notranslate language-django\">{% if &quot;example.com&quot;|is_letsencrypt_valid_hostname %}\n    Wow, this site is example.com!?!\n{% endif %}\n<\/code><\/pre>","slug":"is_letsencrypt_valid_hostname","is_protected":false,"visible_for":0,"tz":"UTC","language":["en"],"doc_source_hash":"fda8e091d6c663dbf86f6c7ceabafcea41f552505c4104d09500f6ee8b99b36b","is_featured":false,"content_group_id":{"id":2551,"is_a":["meta","content_group"],"name":"content_group_imported_docs","title":"Imported documentation","uri":"https:\/\/zotonic.com\/id\/content_group_imported_docs"},"category_id":{"id":325,"is_a":["meta","category"],"name":"template_filter","title":"Filters","uri":"https:\/\/test.zotonic.com\/id\/325"},"doc_source_path":"apps\/zotonic_mod_ssl_letsencrypt\/src\/filters\/filter_is_letsencrypt_valid_hostname.erl","publication_start":"2023-06-24T08:17:53Z","github_url":"https:\/\/github.com\/zotonic\/zotonic\/blob\/master\/apps\/zotonic_mod_ssl_letsencrypt\/src\/filters\/filter_is_letsencrypt_valid_hostname.erl","pivot_location_lng":null,"doc_source_kind":"filter","name":"doc_template_filter_filter_is_letsencrypt_valid_hostname","is_unfindable":false,"is_published":true,"pivot_geocode":null,"created":"2020-05-30T05:47:38Z","uri":null,"doc_status":"current","is_dependent":false,"erlang_app":"zotonic_mod_ssl_letsencrypt","publication_end":"9999-06-01T00:00:00Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"privacy":0,"doc_source_commit":"28493fb676b2d92727e68d4fba20d89c56cf8ead\n","erlang_module":"filter_is_letsencrypt_valid_hostname","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"modified":"2026-10-15T20:07:27Z","title_slug":"is_letsencrypt_valid_hostname"},"uri":"https:\/\/zotonic.com\/id\/1830","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/1830"}},"status":"ok"}