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channelRead0() — netty Function Reference

Architecture documentation for the channelRead0() function in HelloWorldHttp1Handler.java from the netty codebase.

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Entity Profile

Dependency Diagram

graph TD
  59fb26e3_d6a1_690c_13d0_0421f708e901["channelRead0()"]
  653a7c94_6dfd_89c0_369e_fe695dc47f43["HelloWorldHttp1Handler"]
  59fb26e3_d6a1_690c_13d0_0421f708e901 -->|defined in| 653a7c94_6dfd_89c0_369e_fe695dc47f43
  style 59fb26e3_d6a1_690c_13d0_0421f708e901 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/http2/helloworld/server/HelloWorldHttp1Handler.java lines 50–75

    @Override
    public void channelRead0(ChannelHandlerContext ctx, FullHttpRequest req) throws Exception {
        if (HttpUtil.is100ContinueExpected(req)) {
            ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE, Unpooled.EMPTY_BUFFER));
        }

        ByteBuf content = ctx.alloc().buffer();
        content.writeBytes(HelloWorldHttp2Handler.RESPONSE_BYTES.duplicate());
        ByteBufUtil.writeAscii(content, " - via " + req.protocolVersion() + " (" + establishApproach + ")");

        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
        response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
        response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());

        boolean keepAlive = HttpUtil.isKeepAlive(req);
        if (keepAlive) {
            if (req.protocolVersion().equals(HTTP_1_0)) {
                response.headers().set(CONNECTION, KEEP_ALIVE);
            }
            ctx.write(response);
        } else {
            // Tell the client we're going to close the connection.
            response.headers().set(CONNECTION, CLOSE);
            ctx.write(response).addListener(ChannelFutureListener.CLOSE);
        }
    }

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Defined In

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Frequently Asked Questions

What does channelRead0() do?
channelRead0() is a function in the netty codebase, defined in example/src/main/java/io/netty/example/http2/helloworld/server/HelloWorldHttp1Handler.java.
Where is channelRead0() defined?
channelRead0() is defined in example/src/main/java/io/netty/example/http2/helloworld/server/HelloWorldHttp1Handler.java at line 50.

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