main() — netty Function Reference

Architecture documentation for the main() function in HttpSnoopClient.java from the netty codebase.

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Buffer→ Telemetry→ main() — netty Function Reference

Dependency Diagram

graph TD
  228ce974_1294_fd6a_f948_b4801b9384f1["main()"]
  449b073a_eb78_55c5_d393_4d3f1dc5efdc["HttpSnoopClient"]
  228ce974_1294_fd6a_f948_b4801b9384f1 -->|defined in| 449b073a_eb78_55c5_d393_4d3f1dc5efdc
  style 228ce974_1294_fd6a_f948_b4801b9384f1 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/http/snoop/HttpSnoopClient.java lines 47–109

    public static void main(String[] args) throws Exception {
        URI uri = new URI(URL);
        String scheme = uri.getScheme() == null? "http" : uri.getScheme();
        String host = uri.getHost() == null? "127.0.0.1" : uri.getHost();
        int port = uri.getPort();
        if (port == -1) {
            if ("http".equalsIgnoreCase(scheme)) {
                port = 80;
            } else if ("https".equalsIgnoreCase(scheme)) {
                port = 443;
            }
        }

        if (!"http".equalsIgnoreCase(scheme) && !"https".equalsIgnoreCase(scheme)) {
            System.err.println("Only HTTP(S) is supported.");
            return;
        }

        // Configure SSL context if necessary.
        final boolean ssl = "https".equalsIgnoreCase(scheme);
        final SslContext sslCtx;
        if (ssl) {
            sslCtx = SslContextBuilder.forClient()
                .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
        } else {
            sslCtx = null;
        }

        // Configure the client.
        EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
             .channel(NioSocketChannel.class)
             .handler(new HttpSnoopClientInitializer(sslCtx));

            // Make the connection attempt.
            Channel ch = b.connect(host, port).sync().channel();

            // Prepare the HTTP request.
            HttpRequest request = new DefaultFullHttpRequest(
                    HttpVersion.HTTP_1_1, HttpMethod.GET, uri.getRawPath(), Unpooled.EMPTY_BUFFER);
            request.headers().set(HttpHeaderNames.HOST, host);
            request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.CLOSE);
            request.headers().set(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);

            // Set some example cookies.
            request.headers().set(
                    HttpHeaderNames.COOKIE,
                    ClientCookieEncoder.STRICT.encode(
                            new DefaultCookie("my-cookie", "foo"),
                            new DefaultCookie("another-cookie", "bar")));

            // Send the HTTP request.
            ch.writeAndFlush(request);

            // Wait for the server to close the connection.
            ch.closeFuture().sync();
        } finally {
            // Shut down executor threads to exit.
            group.shutdownGracefully();
        }
    }