• WARNING: the directive "H2HeaderStrictness" from v2.0.4 has been
  removed again. Leading/trailing whitespace in header values is now
  being stripped both for requests and responses. The checks for this
  in nghttp2 v1.50.0+ are now always disabled.
  This means that clients that send leading/trailing ws continue to
  work, but that whitespace makes no difference in processing a request.
  This is the same behaviour as in http/1.1 where the Apache parser does
  the stripping as well (since forever).