New error code H32 - TLS certificate mismatch

Change effective on 16 November 2023

We added a new error code: H32 - TLS Certificate Mismatch. This error occurs when the request Host header doesn’t match the hostname sent by the client via Server Name Indication (SNI). This issue can happen if you take requests at one domain and proxy them to another domain using Heroku SSL, without rewriting the Host header to match the second domain.

See the error code documentation for details.