3.253.1

Fixed

• Fixed a stolen HTTP/2 request being sent to the local application over HTTP/1
  without a Host header, which servers that enforce the HTTP/1.1 host
  requirement answer with a 400 response before the application sees the
  request.
• Fixed a stolen HTTP/2 request being sent to the local application over a
  pooled HTTP/1 connection, which made the protocol the application saw depend
  on what was in the connection pool.