I'm trying to figure out how to build a HTTP2 client using the SwiftNIOHTTP2 beta.
Currently my implementation to set up the connection looks like this:
let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
let promise: EventLoopPromise<Void> = group.next().newPromise()
let bootstrap = ClientBootstrap(group: group)
.channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEADDR), value: 1)
.channelInitializer { channel in
channel.pipeline.add(handler: HTTP2Parser(mode: .client)).then {
let multiplexer = HTTP2StreamMultiplexer { (channel, streamID) -> EventLoopFuture<Void> in
return channel.pipeline.add(handler: HTTP2ToHTTP1ClientCodec(streamID: streamID, httpProtocol: .https))
}
return channel.pipeline.add(handler: multiplexer)
}
}
defer {
try! promise.futureResult.wait()
try! group.syncShutdownGracefully()
}
let url = URL(string: "https://strnmn.me")!
_ = try bootstrap.connect(host: url.host!, port: url.port ?? 443)
.wait()
However this fails with the following error:
nghttp2 error: Remote peer returned unexpected data while we expected SETTINGS frame. Perhaps, peer does not support HTTP/2 properly.
Connecting to the server and sending a request using nghttp2 from the command line works fine.
$ nghttp -vn https://strnmn.me
[ 0.048] Connected
The negotiated protocol: h2
[ 0.110] recv SETTINGS frame <length=18, flags=0x00, stream_id=0>
(niv=3)
[SETTINGS_MAX_CONCURRENT_STREAMS(0x03):128]
[SETTINGS_INITIAL_WINDOW_SIZE(0x04):65536]
[SETTINGS_MAX_FRAME_SIZE(0x05):16777215]
[ 0.110] recv WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
(window_size_increment=2147418112)
[ 0.110] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
(niv=2)
[SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
[SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
[ 0.110] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[ 0.110] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
(dep_stream_id=0, weight=201, exclusive=0)
[ 0.110] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
(dep_stream_id=0, weight=101, exclusive=0)
[ 0.110] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
(dep_stream_id=0, weight=1, exclusive=0)
[ 0.110] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
(dep_stream_id=7, weight=1, exclusive=0)
[ 0.110] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
(dep_stream_id=3, weight=1, exclusive=0)
[ 0.111] send HEADERS frame <length=35, flags=0x25, stream_id=13>
; END_STREAM | END_HEADERS | PRIORITY
(padlen=0, dep_stream_id=11, weight=16, exclusive=0)
; Open new stream
:method: GET
:path: /
:scheme: https
:authority: strnmn.me
accept: */*
accept-encoding: gzip, deflate
user-agent: nghttp2/1.34.0
[ 0.141] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[ 0.141] recv (stream_id=13) :status: 200
[ 0.141] recv (stream_id=13) server: nginx
[ 0.141] recv (stream_id=13) date: Sat, 24 Nov 2018 16:29:13 GMT
[ 0.141] recv (stream_id=13) content-type: text/html
[ 0.141] recv (stream_id=13) last-modified: Sat, 01 Jul 2017 20:23:11 GMT
[ 0.141] recv (stream_id=13) vary: Accept-Encoding
[ 0.141] recv (stream_id=13) etag: W/"595804af-8a"
[ 0.141] recv (stream_id=13) expires: Sat, 24 Nov 2018 16:39:13 GMT
[ 0.141] recv (stream_id=13) cache-control: max-age=600
[ 0.141] recv (stream_id=13) x-frame-options: SAMEORIGIN
[ 0.141] recv (stream_id=13) content-encoding: gzip
[ 0.141] recv HEADERS frame <length=185, flags=0x04, stream_id=13>
; END_HEADERS
(padlen=0)
; First response header
[ 0.142] recv DATA frame <length=114, flags=0x01, stream_id=13>
; END_STREAM
[ 0.142] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
(last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])