Documented ApplicationUrlDetection (17.4)#8024
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| * `FirstRequest`: The application URL is set from the first HTTP request received by the server, after which it is locked. Subsequent requests with different `Host` headers are ignored. | ||
| * `EveryRequest`: The application URL is set from the first HTTP request and can be overwritten by every subsequent request. | ||
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| {% hint style="warning" %} |
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[UmbracoDocs.SentenceLength] Write shorter sentences (less than 25 words). For content inside note or warning blocks, add blank lines around the content.
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| Previously before v9, it was required to specify **backoffice** path as this was customizable (`/umbraco` by default). However, from v9+ this is no longer possible, so it's sufficient to use the URL that contains the scheme (http/https) and complete hostname. | ||
| Previously before v9, it was required to specify the **backoffice** path as this was customizable (`/umbraco` by default). However, from v9+ this is no longer possible, so it's sufficient to use the URL that contains the scheme (http/https) and complete hostname. |
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[UmbracoDocs.UmbracoTerms] Use 'Umbraco' instead of 'umbraco.' for consistency.
| * `FirstRequest`: The application URL is set from the first HTTP request received by the server, after which it is locked. Subsequent requests with different `Host` headers are ignored. | ||
| * `EveryRequest`: The application URL is set from the first HTTP request and can be overwritten by every subsequent request. | ||
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| {% hint style="warning" %} |
There was a problem hiding this comment.
[UmbracoDocs.SentenceLength] Write shorter sentences (less than 25 words). For content inside note or warning blocks, add blank lines around the content.
sofietoft
approved these changes
Apr 30, 2026
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📋 Description
Documented the new
ApplicationUrlDetectionsetting. Written with AI support.📎 Related Issues (if applicable)
umbraco/Umbraco-CMS#22307
✅ Contributor Checklist
I've followed the Umbraco Documentation Style Guide and can confirm that:
Product & Version (if relevant)
CMS 17.4
Deadline (if relevant)
With the release candidate of 17.4, scheduled for Thursday 30th April