SA1019: echo.MIMEApplicationJSONCharsetUTF8 is deprecated: Please use MIMEApplicationJSON instead. JSON should be encoded using UTF-8 by default. No "charset" parameter is defined for this registration. Adding one really has no effect on compliant recipients. See RFC 8259, section 8.1. https://datatracker.ietf.org/doc/html/rfc8259#section-8.1 (staticcheck)