netty（二十一）http代理服务器（二）简书
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1.2 手动登录，取得chrome net，找到bookmark这个请求，找到request header，统统复制
1.3 将复制的cookie放到postman中，建一个http header（Cookie -- xxx）
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2 netty代理服务器+httpclient
2.1
org.apache.http.conn.HttpHostConnectException: Connect to localhost:443 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused (Connection refused)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:159)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:359)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at com.jds.test.httpproxy.httpclient.apache.HttpclientProxySender.send(HttpclientProxySender.java:83)
at com.jds.test.httpproxy.httpclient.ReqQueue$Customer.run(ReqQueue.java:42)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
2.2 client追加host header
ok
原2.5.4，忽略代理服务器http 客户端的HOST头设置，通过本次实践，认为有时不应忽略，将此句常驻代码；2021.2.3-而refeer与origin根据2.5.4的猜测，不常驻，下图显示该两个header为注释状态
3.4中，httpUriRequest.setHeader("Host", host);被注释，本次放开注释才能继续（如2.2种，追加一个http header Host）
HttpclientProxySender
4 netty client
4.1
Caused by: java.lang.NullPointerException
at io.netty.buffer.Unpooled.wrappedBuffer(Unpooled.java:154)
at com.jds.test.httpproxy.miniserver.BodyToResponseEncoder.encode(BodyToResponseEncoder.java:25)
FullHttpResponse response = new DefaultFullHttpResponse(
HttpVersion.HTTP_1_1,
HttpResponseStatus.valueOf(resHttp.getRet()),
Unpooled.wrappedBuffer(resHttp.getBody()));
很明显，对后端jianshu的服务器没有返回，然后返回前端的http报文编码报异常
回顾一下netty client机制：
代理使用nettyclient建立连接——阻塞连接直到close——将后端jianshu报文返回前端，encode——报错
难道是建立连接失败？果然是，而且没有监控connet回调从而没打印日志，这个地方显示了我对netty代码健壮度把握不够
尽管connet没直接抛出异常，但是连接的回调显示：
io.netty.channel.ConnectTimeoutException: connection timed out: www.jianshu.com/106.75.17.181:8080 at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:220) at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38) at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:120) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) at java.lang.Thread.run(Thread.java:745)
原来是端口没给对
4.2 改为80端口：
io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: 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
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:971)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:327)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
at java.lang.Thread.run(Thread.java:745)
javax.net.ssl.SSLException: SSLEngine closed already
4.3 改为443端口 ok
同样，netty作为client时，Host也是需要的
5 有机会将netty proxy server改为java 原生server
6 2022.8.11 补充，之前就有的问题
strict-origin-when-cross-origin 好像是跨域所致
