The Authorization Header Is Missing in WordPress Explained (2026)

https://www.ahosting.net/blog/the-aut... When WordPress Site Health says "The authorization header is missing", the text blames third-party applications you have approved, and the usual advice is to disable plugins. During the test, the third-party application is Site Health itself: it sends its own fake login to a REST route on your site and checks whether PHP received it. This video walks through the WordPress 7.1.2 source: what the test sends, the difference between a missing and an invalid header, whether the warning matters on your site, why CGI and FastCGI servers drop the header, the four cases where flushing permalinks cannot write the fix, how to add the rule by hand, and the application-password test that proves it worked. 00:00 The authorization header is missing: what Site Health tests 00:47 What request does Site Health send to test the header? 01:01 The authorization header is missing vs invalid 01:41 Does the Authorization header warning matter on your site? 02:19 Why the Authorization header goes missing on CGI and FastCGI 03:18 Why flush permalinks leaves the Authorization header missing 03:47 How to add the Authorization rule by hand 04:11 Prove the header reaches WordPress with an app password By Matt Chrust, Director of Business Development at AHosting. Full written guide, including the AHosting Authorization Header Decoder and the exact rule, at the link above.