CL 111835 changed Transport stream ID numbering to start at
stream 3 when AllowHTTP is set. This was based on a
misunderstanding:

When a connection upgrades an HTTP/1.1 request to HTTP/2,
the initial HTTP/1.1 request occupies stream 1.
However, Transport does not perform HTTP protocol upgrades.
When using a Transport to send unencrypted HTTP/2 requests,
the entire connection uses HTTP/2, the first request is
sent as HTTP/2, and there is no reason not to use stream 1
for this request.

Starting from stream 3 is mostly harmless,
but ClientConn.idleStateLocked assumes that client streams
start from 1. This causes it to misidentify new single-use
connections as having already sent a request (when AllowHTTP
is set), and therefore not suitable for use.

Revert to always starting stream IDs at 1.

Fixes golang/go#67671

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The ReadMsgUDP and WriteMsgUDP methods of UDPConn are not implemented
(yet?) on Plan 9. Skip tests which require them.

Fixes golang/go#68288

Change-Id: Ic6c81b19322d589c10b16da61e9b89284294be05
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Update golang.org/x dependencies to their latest tagged versions.

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Very minor tweaks:
 - Remove (c) pseudosymbol.
 - Remove "All Rights Reserved."
 - Change "Google Inc." (no longer exists) to "Google LLC".

[git-generate]
echo '
,s/\(c\) //
,s/ All rights reserved.//
,s/Google Inc./Google LLC/
w
q
' | sam -d LICENSE

Change-Id: Ibaa49e00dd08950a577e4343bfc574980d327995
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The XSRF token generation function creates the padded base64 string by
base64.URLEncoding, then removes the padding. It is equivalent to the
base64.RawURLEncoding but with more costs.

Change-Id: I9cf5ad94e9cf3dca9bbfc1b6818ab07d41acf417
GitHub-Last-Rev: a8263b5
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Update golang.org/x dependencies to their latest tagged versions.

Change-Id: I6a2e43cca79f719c018887e1d75b578fc27be8f1
Reviewed-on: https://go-review.googlesource.com/c/net/+/603399
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For golang/go#69267.

Change-Id: Ica6d123312495966ad6d222d67944fd602216853
Reviewed-on: https://go-review.googlesource.com/c/net/+/610799
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Update golang.org/x dependencies to their latest tagged versions.

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sizeofSockaddrInet is 16, but first byte of sockaddr specifies actual
size of sockaddr.

Although, 16 works for most cases, it fails for Netmasks addresses. On
Darwin only the significant bits of the netmask are in the msg.

Take this route message as an example

```
// rt_msg_hdr
88 00 05 01 00 00 00 00
41 08 00 00 07 00 00 00
92 7b 00 00 01 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00

// metrics
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

// SOCKADDRS - DST  (100.113.0.0)
10 02 00 00 64 71 00 00
00 00 00 00 00 00 00 00

// GW  utun4319
14 12 21 00 01 08 00 00
75 74 75 6e 34 33 31 39
00 00 00 00

// NETMASK 255.255.0.0
06 02 00 00 ff ff

// NULL
00 00
```

i.e. ipv4
```
06 02 00 00 ff ff
```

The above byte sequence is for a sockaddr that is 6 bytes long
representing an ipv4 for address that is 255.255.0.0.

i.e. ipv6 netmask
```
0e 1e 00 00 00 00 00 00 ff ff ff ff ff ff 00 00
```

The above is `/48` netmask that should also be parsed using `b[0]` of the
sockaddr that contains the length.

Confirmed by using `route monitor`.

sources:
https://github.com/apple/darwin-xnu/blob/main/bsd/net/route.h
https://github.com/apple/darwin-xnu/blob/main/bsd/sys/socket.h#L603

Fixes golang/go#44740

Change-Id: I8153130d02d0a5e547fbf60a85762d3889e1d08c
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Transports support a WriteByteTimeout option which sets the maximum
amount of time we can go without being able to write any bytes to
a connection. Add an equivalent option to Server for consistency.

Fixes golang/go#61777

Change-Id: Iaa8a69dfc403906eb224829320f901e5a6a5c429
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Add configurable support for health-checking idle connections
accepted by the HTTP/2 server, following the same configuration
as the Transport.

Fixes golang/go#67812

Change-Id: Ia4014e691546b2c29db8dad3af5f39966d0ceb93
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For golang/go#67813

Change-Id: I6b7f857d6ed250ba8b09649730980a91b3e8d7e9
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Maintenance of nhooyr.io/websocket has moved to github.com/coder/websocket.

Read more about the transition at https://coder.com/blog/websocket

Updates golang/go#18152

Change-Id: Ia2b11c9a57ad7ded775b50a5bbb7ea91562d39b5
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Update golang.org/x dependencies to their latest tagged versions.

Change-Id: I57613519f6e5795e60d258865e81f6954d672606
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