客户端运行sdk的Main.main(),产生如下错误：
cancel group manager success
5504 [main] INFO AdminHttpUtils - http request content: {"group_id":"groupId1","members":["user4","user5"],"is_manager":true,"operator":"user1"}
5507 [main] INFO AdminHttpUtils - Request error: 500 error msg:null
java.lang.Exception: Http request error with code:500
at cn.wildfirechat.sdk.utilities.AdminHttpUtils.httpJsonPost(AdminHttpUtils.java:92)
at cn.wildfirechat.sdk.GroupAdmin.muteGroupMemeber(GroupAdmin.java:113)
at cn.wildfirechat.sdk.Main.testGroup(Main.java:417)
at cn.wildfirechat.sdk.Main.testAdmin(Main.java:36)
at cn.wildfirechat.sdk.Main.main(Main.java:22)
此时Server段输出：
360708 [nioEventLoopGroup-5-11] WARN DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1100)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:372)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:123)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
at java.lang.Thread.run(Thread.java:748)
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