NewsBlur only spoke HTTP/1.1 when fetching feeds, and Dumbing of Age’s server started refusing HTTP/1.1 with that 426 a few days ago. The error page is misleading since it has nothing to do with SSL, and the missing Upgrade header didn’t matter because NewsBlur never looked at it. HTTP/2 works fine, so I added a fallback: when a feed answers with a 426, NewsBlur now retries it over HTTP/2.
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