Streamline HTTP/2 request header copy#2181
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…euse toRelativeUrl for :path)
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Motivation:
sendHttp2Frames copies HTTP/1.1 headers into Http2Headers on every HTTP/2 request (hot path):
String-materializes each name, toLowerCase() per name, HashSet probe — plus a
path + "?" + query concat for :path.
Modification:
:path from Uri.toRelativeUrl() (pooled, byte-identical); copy via iteratorCharSequence() +
AsciiString.contentEqualsIgnoreCase against HttpHeaderNames, dropping HTTP2_EXCLUDED_HEADERS.
Still lowercases (validating DefaultHttp2Headers throws on uppercase) but allocation-free when
already lowercase. Adds wire + :path-equivalence tests; updates the JMH benchmark.
Result:
Behavior-preserving; ~1.17x faster, -24 B/op (JMH, JDK 11). Full CI matrix green.