07eec67d1e
Motivation: The DefaultHttp2Headers code is throwing a IllegalArgumentException if an invalid character is detected. This is being ignored by the HTTP/2 codec instead of generating a GOAWAY. Modifications: - Throw a Http2Exception of type PROTOCOL_ERROR in accordance with https://tools.ietf.org/html/rfc7540#section-8.1.2.6 - Update examples which were building invalid headers Result: More compliant with https://tools.ietf.org/html/rfc7540#section-8.1.2.6