[quicwg/base-drafts] How long is Initial (#2167)

[ekr <[e-mail]>]

the TLS draft says:

```
QUIC requires that the first Initial packet from a client contain an entire
cryptographic handshake message, which for TLS is the ClientHello.  Though a
packet larger than 1200 bytes might be supported by the path, a client improves
the likelihood that a packet is accepted if it ensures that the first
ClientHello message is small enough to stay within this limit.
```

This clearly implies that you can have an Initial > 1200 bytes.

However, transport S 7.1 says

```
   Clients MUST pad UDP datagrams that contain only Initial packets to
   1200 bytes.  Once a client has received an acknowledgment for a
   Handshake packet it MAY send smaller datagrams.  Sending padded
   datagrams ensures that the server is not overly constrained by the
   amplification restriction.
```

But you can't pad to 1200 bytes if you are over 1200 bytes. so which one is it?

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