This new method sends a PING frame with random payload to the peer and
wait for a PING ack with the same payload.

In order to support cancellation and deadling, the Ping method takes a
context as argument.

Fixes golang/go#15475

Change-Id: I340133a67717af89556837cc531a885d116eba59
Reviewed-on: https://go-review.googlesource.com/29965Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The existing implementation has a hardcoded "https" scheme for
all request, since it allows http scheme in the request, it should
use the scheme in the request url.

Fixes golang/go#17257

Change-Id: Ibd9528df0328d7630ee94a006db694645625cdc9
Reviewed-on: https://go-review.googlesource.com/29975
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This change introduces a package that provides basic functions for the
manipulation of logical network interfaces, interface addresses and
data links on Solaris.

As BSD variants implement routing socket and routing messages, Linux
implements netlink socket and netlink messages, Solaris implements
STREAMS-like interface for reading, writing network facility
information inside the kernel. The package wraps various I/O control
calls which involve message exchanges between kernel protocol modules
in exposed APIs.

At present, the package supports Solaris 11 or above.

Updates golang/go#7177.

Change-Id: I192d85e53b0bee942dfefca0f73a3eb94ab8bfe9
Reviewed-on: https://go-review.googlesource.com/29893Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I41d449e071f1d40bdc69288e7290af168b6b0d3c
Reviewed-on: https://go-review.googlesource.com/29693Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Iaec7505bea3ea29cd58147b6057f03a4c7f0861c
Reviewed-on: https://go-review.googlesource.com/29694Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I2e0a8f0e344a2fc31b3d40e0b9f3812dbbd75569
Reviewed-on: https://go-review.googlesource.com/29695Reviewed-by: Ian Lance Taylor <iant@golang.org>

Rename method receivers of propVirtual and make the String method of
Inet4Addr use of a pointer receiver.

Change-Id: I422593cf4028d83f856efa55c631f69fdce0514d
Reviewed-on: https://go-review.googlesource.com/28993
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

testServerResponse had dead code -- it was not checking the return
value from the handler func. This fix revealed two broken tests, which
were also fixed.

Change-Id: I7cd6f6c71dbd909fa3b0aff7f98a47dade42913b
Reviewed-on: https://go-review.googlesource.com/29434Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I1530dadf32cc85c25dc7c88b4e7b6ebbbbcb2d3a
Reviewed-on: https://go-review.googlesource.com/29241Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: If0bcd08de56518ec1dd79476bc37e276ae550d47
Reviewed-on: https://go-review.googlesource.com/28998
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Also consolidate platform-dependent helper files.

Updates golang/go#17015.

Change-Id: Ibf09479762029ecc7229ab4bb233138e0d4e69d9
Reviewed-on: https://go-review.googlesource.com/28997
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

bodyAndLength mutates Request.Body if Request.ContentLength == 0,
reading the first byte to determine whether it's actually empty or
just undeclared. But we did that before we checked whether our
connection was overloaded, which meant the caller could retry the
request on an new or lesser-loaded connection, but then lose the first
byte of the request.

Updates golang/go#17071 (needs bundle into std before fixed)

Change-Id: I996a92ad037b45bc49e7cf0801a2027bbbb3c920
Reviewed-on: https://go-review.googlesource.com/29074Reviewed-by: Gleb Stepanov <glebstepanov1992@gmail.com>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

No tests, because tests are in std. (See TestTransportIDNA_h2)

Updates golang/go#13835

Change-Id: I0a327d9652ea5e6f32dfa279550915af61567bed
Reviewed-on: https://go-review.googlesource.com/29071
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

In the most recent commit (git 3a1f9e, CL 27632) I introduced a bug
where I improperly started rejecting an outgoing :path of '*'.  That
CL was never vendored into std. Once I tried to vendor it and run the
tests, the tests failed due to this regression.

So, fix the bug and allow '*' (e.g. for OPTIONS requests). No test
updates because the tests are already in std, and now pass (again).

Change-Id: Ibb91a17145d381da0fd0ea193e8a1bd59f03c3fa
Reviewed-on: https://go-review.googlesource.com/29070Reviewed-by: Chris Broadfoot <cbro@golang.org>

This change fixes lazy socket descriptor handling in ListenPacket to
avoid treading on someone's socket descriptors which are recycled by
descriptor duplication. The issue happens when calling ListenPacket for
non-privileged ICMP endpoint concurrently.

Fixes golang/go#16969.

Change-Id: I4d7672535f5aeb2a0b71f8af2c7ba271a085f418
Reviewed-on: https://go-review.googlesource.com/28473
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Temporary workaround until the problem is identified and a more
granular skip or fix is added.

Updates golang/go#17015

Change-Id: If3f940f9f318a3b41669fd6e870a17727d2fee82
Reviewed-on: https://go-review.googlesource.com/28587Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

Updates golang/go#16228
Updates golang/go#11041

Change-Id: I2b50c2f4bfaae2d9ad59bc78e1c7c3e807f08075
Reviewed-on: https://go-review.googlesource.com/28344
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Ia274e47affd5fc2b9bdea077fa8043887044d0ec
Reviewed-on: https://go-review.googlesource.com/28110
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I836cdf68901dc77bc4c086cabd9d43fd033fbf1d
Reviewed-on: https://go-review.googlesource.com/27736Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: If22f722cf87f7e5833b9c9aea0a078db83f37c26
Reviewed-on: https://go-review.googlesource.com/27734Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Idb2a2eb354c2835e6cae7e269730c599abb1c8d7
Reviewed-on: https://go-review.googlesource.com/27735
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Idffb7eace4d7913e7dfad2715d10dcd1762f83e4
Reviewed-on: https://go-review.googlesource.com/27733
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This change introduces an internal package that provides the
manipulation of net package facilities by using runtime reflection.
The package is supposed to be used by ipv4 and ipv6 packages.

Change-Id: I73ec3b7d3762e675ca03ad9ee5e8a68e75ceb997
Reviewed-on: https://go-review.googlesource.com/27732
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes golang/go#16847

Change-Id: I1e6ae1e0746051fd4cf7afc9beae7853293d5b68
Reviewed-on: https://go-review.googlesource.com/27632Reviewed-by: Chris Broadfoot <cbro@golang.org>

The mod_h2 workaround CL (git rev 28d1bd4f,
https://golang.org/cl/25362) introduced a regression where the
Transport could write two DATA frames, both with END_STREAM, if the
Request.Body returned (non-0, io.EOF). strings.Reader, bytes.Reader
are the most common Reader types used with HTTP requests and they only
return (0, io.EOF) so we got generally lucky and things seemed to
work, but other Readers do return (non-0, io.EOF), like the HTTP
transport/server Readers. This is why we broke the HTTP proxy code,
when proxying to HTTP/2.

Updates golang/go#16788 (fixes after it's bundled into std)

Change-Id: I42684017039eacfc27ee53e9c11431f713fdaca4
Reviewed-on: https://go-review.googlesource.com/27406
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

Update the list to revision 533b016049473e520193e70156e4b54dc1f19568
(2016-08-05T11:21:15Z).

Change-Id: Ic79e83245a86a0c27ac855479073be41c970c527
Reviewed-on: https://go-review.googlesource.com/26851Reviewed-by: Nigel Tao <nigeltao@golang.org>

The http2 spec says:

> When the value of SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver
> MUST adjust the size of all stream flow-control windows that it
> maintains by the difference between the new value and the old value.

We didn't do this before, and it never mattered until
https://golang.org/cl/25362 for golang/go#16519 because we always knew
the peer's initial window size.

Once we started writing request bodies before hearing the peer's
setting (and thus assuming 64KB), it became very important that this
TODO was done. Should've done it earlier.

More details in the bug.

Updates golang/go#16612 (fixes after bundle into std)

Change-Id: I0ac0280bdd5f6e933ad82f8c9df3c4528295bac2
Reviewed-on: https://go-review.googlesource.com/25508Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

Change-Id: Ic37b6b84bfc695cfb1ca7cf8e7da52c801e6d236
Reviewed-on: https://go-review.googlesource.com/25500Reviewed-by: Chris Broadfoot <cbro@golang.org>

For debugging golang/go#16514

Change-Id: I8aa5706eef4e9b4104cab391172b8919601ebf3a
Reviewed-on: https://go-review.googlesource.com/25440Reviewed-by: Chris Broadfoot <cbro@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

If the Transport got a stream error on the response headers, it was
never unblocking the client. Previously, Response.Body reads would be
aborted with the stream error, but RoundTrip itself would never
unblock.

The Transport now also sends a RST_STREAM to the server when we
encounter a stream error.

Also, add a "Cause" field to StreamError with additional detail. The
old code was just returning the detail, without the stream error
header.

Fixes golang/go#16572

Change-Id: Ibecedb5779f17bf98c32787b68eb8a9b850833b3
Reviewed-on: https://go-review.googlesource.com/25402
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

To help debug golang/go#16572

Change-Id: Ia154faedd243a06a4110f6e6a4885b7cd0a04e1f
Reviewed-on: https://go-review.googlesource.com/25401Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The http2 server implementation in Apache (mod_http2, aka mod_h2) had
a bug where it didn't reply to the initial SETTINGS frame until it had
received a request. Apache 2.4.17 was the first Apache version to
include mod_http2 and has the bug.

The bug was fixed 20 days ago
(https://github.com/apache/httpd/commit/de4e3031aeb9775d2ebb9c917ecb1117c12d05f8)
for Apache 2.5.0 and included in the out-of-tree mod_h2 1.5.12
(https://github.com/icing/mod_h2/releases/tag/v1.5.12) but most Apache
sites are running older versions making them incompatible with Go's
client. (At least Debian Stretch and Ubuntu Xenial, currently.)

Chrome, curl, Firefox et al don't wait for the initial SETTINGS
response & ACK before sending their first request, which is why
mod_http2 didn't notice their bug for some time.

This change makes Go's http2.Transport act like other common HTTP/2
clients and not wait for the peer's SETTINGS frame & ACK before
sending the first request.

As a bonus, this reduces the latency for the first request on
connections by one RTT.

The reason we waited for the initial settings is purely
historical. Andrew and I just wrote it that way when initially
developing the client on video (https://www.youtube.com/watch?v=yG-UaBJXZ80)
because we were working top-down through the protocol and didn't
get back to optimizing the RTT away. It also seemed more compliant to
wait for the peer's SETTINGS to know the frame size and such, but as
as spec says, it's permitted for clients to not wait:

http://httpwg.org/specs/rfc7540.html#rfc.section.3.5

> To avoid unnecessary latency, clients are permitted to send
> additional frames to the server immediately after sending the client
> connection preface, without waiting to receive the server connection
> preface. It is important to note, however, that the server
> connection preface SETTINGS frame might include parameters that
> necessarily alter how a client is expected to communicate with the
> server. Upon receiving the SETTINGS frame, the client is expected to
> honor any parameters established. In some configurations, it is
> possible for the server to transmit SETTINGS before the client sends
> additional frames, providing an opportunity to avoid this issue.

So, don't wait.

Fixes golang/go#16519

Change-Id: I916827e49829f7f107a51838512816916fb553fc
Reviewed-on: https://go-review.googlesource.com/25362Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

http://httpwg.org/specs/rfc7540.html#rfc.section.6.1 says:

> The entire DATA frame payload is included in flow control, including
> the Pad Length and Padding fields if present.

But we were just ignoring the padding and pad length, which could lead
to clients and servers getting out of sync and deadlock if peers used
padding. (Go never does, so it didn't affect Go<->Go)

In the process, fix a lingering bug from golang/go#16481 where we
didn't account for flow control returned to peers in the stream's
inflow, despite sending the peer a WINDOW_UPDATE.

Fixes golang/go#16556
Updates golang/go#16481

Change-Id: If7150fa8f0da92a60f34af9c3f754a0346526ece
Reviewed-on: https://go-review.googlesource.com/25382
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

For both the server and the transport, return connection-level flow control in
two cases: 1) when a stream is closed with buffered data not read by the user,
or 2) when a DATA frame arrives but there the stream has since been closed.

Fixes golang/go#16481

Change-Id: Ic7404180ed04a2903e8fd6e9599a907f88b4f72e
Reviewed-on: https://go-review.googlesource.com/25231Reviewed-by: Andrew Gerrand <adg@golang.org>

NewClientConn starts a goroutine (which reads cc.singleUse at start),
so it's not safe to set cc.singleUse after calling NewClientConn.

Change-Id: I5c28db15e8e8fd8ec5ef0e04b7f81e61efbd873e
Reviewed-on: https://go-review.googlesource.com/25230Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes golang/go#16438.

Change-Id: I2a97e57cae298e8eecdd5637c9e03493a449fc62
Reviewed-on: https://go-review.googlesource.com/25070
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes flakes like:
https://build.golang.org/log/56e0561f9f6a740b75538692a1c3288f08949dd0

I reproduced the flake above with a time.Sleep(50 * time.Millisecond)
before ClientConn.RoundTrip's final for{select{...}} loop (to give
multiple channels time to become readable on the first select), and
then ran (on linux/amd64) with:

go test -v -run=TestTransportReqBodyAfterResponse_403 -count=50 -race

Before, many failed. With this CL it never fails. (crosses fingers)

Fixes golang/go#16102 (again)

Change-Id: I93fde46846cd09445e53c140e9668382965d95c5
Reviewed-on: https://go-review.googlesource.com/24984
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Both "Connection: close" and Request.Close should mean the same thing:
to use the same connection.

The Request.Close case was fixed in https://golang.org/cl/24810 for
Request.Close but I forgot about "Connection: close". Unify the code.

Fixes flaky failures such as:
https://storage.googleapis.com/go-build-log/6adb97bd/freebsd-amd64-gce101_5c331c2a.log
(noticed by Ian on a https://golang.org/cl/24977 trybot run)

Updates golang/go#15612

Change-Id: I3ab5175b8bc528ee240370c906b00cc691651bb4
Reviewed-on: https://go-review.googlesource.com/24982Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This preserves the promise that Do will return the context's error.

Fixes golang/go#16381

Change-Id: I0db49b175736a695199b38819b4ff97b83d9c5ed
Reviewed-on: https://go-review.googlesource.com/24977
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The test's server was replying with the stream closure before reading
the test client's request body. This should in theory be handled
better (and golang/go#16029 will be kept open to track it), but that's not
what this test was trying to test anyway.

Instead, make the test do things in the expected order so it can
continue to test its original subject reliably. (It was trying to test
all the orders of optional & optionally fragmented headers in responses.)

Updates golang/go#16029 (flaky http2 TestTransportResPattern_*)
Updates golang/go#11811 (subrepos need to be green)

Change-Id: I631730fce5dad598120bb2d1ea8895e39255d711
Reviewed-on: https://go-review.googlesource.com/24970Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>