Reduce required JDK version for DefaultHeaders feature #1375
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Subsystem
Server, DefaultHeaders
Motivation
Currently, DefaultHeaders feature requires JDK8 due to java.time dependency. However, the only we need is GMT time formatting.
#1369 java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/ZoneId;
Solution
Migrate to ktor's
GMTDate
withCalendar
instantiation optimization.