HTTP/2 Client react on PUSH_PROMISE Frame

[lukeju...@gmail.com]

Hello,

after my Server now is able to send PUSH_PROMISE Frames. I try to push resources to the client. Therefore i want to know: How do i have to handle the PUSH_PROMISE on the Client. For now the Client answers automaticly with a GO_AWAY Frame.

Regards,

Luke

[Julien Viet]

you need to handle the push promise with the Http2FrameListener onPushPromiseRead and I think then there is nothing else special to do except receive the headers / data frames for this new stream.

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[lukeju...@gmail.com]

Thank you again. Can I simply add the Http2FrameListener to the Client Pipeline?

[Julien Viet]

it needs to be registered against the Http2ConnectionDecoder

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[lukeju...@gmail.com]

Ok, can't I use a Class extends Http2ConnectionHandler implements Http2FrameListener to handle PUSH_PROMISES?

[lukeju...@gmail.com]

I have a problem to find the right place to add the Http2FrameListenere on netty http2 client example (https://github.com/netty/netty/tree/4.1/example/src/main/java/io/netty/example/http2/helloworld/client)

You may have a hint for me?

Regards and thank you!

[Julien Viet]

this client uses an adapter of HTTP/1.1 on top of HTTP/2 so there is no way to do it this way.

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[Julien Viet]

actually what I said is stupid :-), HTTP/1.1 is used for the Upgrade

let me look

[Julien Viet]

actually no, I was right.

this example does not use the HTTP/2 api and instead the HTTP/1.1 codec :

Process {@link io.netty.handler.codec.http.FullHttpResponse} translated from HTTP/2 frames

so you need to look elsewhere.

[lukeju...@gmail.com]

I thought that the 1.1 upgrade lets the Client Server Communication run over HTTP/2 Api :/

So i have to write a Client in HTTP/2 to use the HTTP/2 API. This is possible in netty?

[Julien Viet]

of course!

but client/server api are really similar once you get the HTTP2Connection and the codec.

you should first focus on setting up an Http2Connection in the client using the Http2ConnectionBuilder and then after register your frame listener

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[lukeju...@gmail.com]

Okay,

i will try to set up the client on HTTP2.

I am using netty 4.1 RC7 btw.

A problem i figured out earlier was that the import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; is the highest Version i find. So i was not able to send GET or POST Requests over HTTP2....

So i have to set up a connection? And then i can sent POST / GETS via frames and streams manually?

[Julien Viet]

yes.

you make requests using the encoder .

you receive responses with the frame listener .

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[lukeju...@gmail.com]

Thank you. Can i answer you for further questions?

[Julien Viet]

I think you can post questions in this forum and people can reply, I will reply if I’m available and I can help you, otherwise others might as well!

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[lukeju...@gmail.com]

Now i am able to call the encoder from my main method

  Http2ResponseHandler http2responseHandler = initializer.http2responseHandler();

            http2responseHandler.encoder().writeFrame(ChannelHandlerContext ctx, byte frameType, int streamId, Http2Flags flags, ByteBuf payload, ChannelPromise promise)

now i have the question about the ChannelHandlerContext. I have non  in my main method. So where to create it?`because its needed to do the request...

[lukeju...@gmail.com]

I changed it to this

ByteBuf payload = unreleasableBuffer(copiedBuffer(poststring, CharsetUtil.UTF_8));

http2responseHandler.encoder().writeFrame(ctx, Http2FrameTypes.HEADERS, streamId, new Http2Flags().priorityPresent(true) , payload, ctx.newPromise());

Now i recive

----------------OUTBOUND--------------------

[id: 0x1b3be271, L:/127.0.0.1:3152 - R:/127.0.0.1:8443] UNKNOWN: frameType=1, streamId=5, flags=32, length=46, bytes=7b2

022616374696f6e223a20226368616e6e656c5f666f725f70757368222c202273747265616d4964223a20357d

What means UNKNOWN: there Should be HEADERS ...

[lukeju...@gmail.com]

you should first focus on setting up an Http2Connection in the client using the Http2ConnectionBuilder and then after register your frame listener

i didnt find the named  Http2ConnectionBuilder  :/

[Julien Viet]

I meant : AbstractHttp2ConnectionHandlerBuilder

this could have been named by Spring folks :-)

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[liuch...@gmail.com]

Hi luke

Have you resolved this issue? I also found this error.

Thanks.

在 2016年4月15日星期五 UTC+8下午5:10:08，lukeju...@gmail.com写道：