target = "https://www.rfc-editor.org/rfc/rfc9000#section-5.2.2"

# 5.2.2.  Server Packet Handling
#
# If a server receives a packet that indicates an unsupported version
# and if the packet is large enough to initiate a new connection for
# any supported version, the server SHOULD send a Version Negotiation
# packet as described in Section 6.1.  A server MAY limit the number of
# packets to which it responds with a Version Negotiation packet.
# Servers MUST drop smaller packets that specify unsupported versions.
# 
# The first packet for an unsupported version can use different
# semantics and encodings for any version-specific field.  In
# particular, different packet protection keys might be used for
# different versions.  Servers that do not support a particular version
# are unlikely to be able to decrypt the payload of the packet or
# properly interpret the result.  Servers SHOULD respond with a Version
# Negotiation packet, provided that the datagram is sufficiently long.
# 
# Packets with a supported version, or no Version field, are matched to
# a connection using the connection ID or -- for packets with zero-
# length connection IDs -- the local address and port.  These packets
# are processed using the selected connection; otherwise, the server
# continues as described below.
# 
# If the packet is an Initial packet fully conforming with the
# specification, the server proceeds with the handshake (Section 7).
# This commits the server to the version that the client selected.
# 
# If a server refuses to accept a new connection, it SHOULD send an
# Initial packet containing a CONNECTION_CLOSE frame with error code
# CONNECTION_REFUSED.
# 
# If the packet is a 0-RTT packet, the server MAY buffer a limited
# number of these packets in anticipation of a late-arriving Initial
# packet.  Clients are not able to send Handshake packets prior to
# receiving a server response, so servers SHOULD ignore any such
# packets.
# 
# Servers MUST drop incoming packets under all other circumstances.

[[spec]]
level = "SHOULD"
quote = '''
If a server receives a packet that indicates an unsupported version
and if the packet is large enough to initiate a new connection for
any supported version, the server SHOULD send a Version Negotiation
packet as described in Section 6.1.
'''

[[spec]]
level = "MAY"
quote = '''
A server MAY limit the number of
packets to which it responds with a Version Negotiation packet.
'''

[[spec]]
level = "MUST"
quote = '''
Servers MUST drop smaller packets that specify unsupported versions.
'''

[[spec]]
level = "SHOULD"
quote = '''
Servers SHOULD respond with a Version
Negotiation packet, provided that the datagram is sufficiently long.
'''

[[spec]]
level = "SHOULD"
quote = '''
If a server refuses to accept a new connection, it SHOULD send an
Initial packet containing a CONNECTION_CLOSE frame with error code
CONNECTION_REFUSED.
'''

[[spec]]
level = "MAY"
quote = '''
If the packet is a 0-RTT packet, the server MAY buffer a limited
number of these packets in anticipation of a late-arriving Initial
packet.
'''

[[spec]]
level = "SHOULD"
quote = '''
Clients are not able to send Handshake packets prior to
receiving a server response, so servers SHOULD ignore any such
packets.
'''

[[spec]]
level = "MUST"
quote = '''
Servers MUST drop incoming packets under all other circumstances.
'''