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javademos/docs/output/31-tls-clienthello-size.txt
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# Size of the first TLS record (the ClientHello) each JDK sends
=== JDK 26
java.version = 26.0.2.1
record type = 0x16 (0x16 = handshake)
ClientHello record = 417 bytes (+5 byte record header)
fits one TCP segment = yes (1460-byte MSS on a 1500-byte MTU)
=== JDK 27
java.version = 27
record type = 0x16 (0x16 = handshake)
ClientHello record = 1573 bytes (+5 byte record header)
fits one TCP segment = NO (1460-byte MSS on a 1500-byte MTU)
=== JDK 27 with -Djdk.tls.namedGroups=x25519,secp256r1 (post-quantum group removed)
java.version = 27
record type = 0x16 (0x16 = handshake)
ClientHello record = 408 bytes (+5 byte record header)
fits one TCP segment = yes (1460-byte MSS on a 1500-byte MTU)