我的Async http客户端有一个奇怪的问题，netty作为http提供者，它是一个播放应用程序，调用我们无法访问的远程Web服务。同样重要的是要注意该服务是在SSL加密的域上，并且只响应该域而不是IP。 堆栈跟踪：
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[na:1.7.0_60]
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[na:1.7.0_60]
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[na:1.7.0_60]
at sun.nio.ch.IOUtil.read(IOUtil.java:192) ~[na:1.7.0_60]
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379) ~[na:1.7.0_60]
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:64) ~[netty-3.9.2.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108) ~[netty-3.9.2.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318) ~[netty-3.9.2.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) ~[netty-3.9.2.Final.jar:na]
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) ~[netty-3.9.2.Final.jar:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_60]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_60]
最奇怪的是，这是突然发生的（这是客户使用的测试环境），这让我相信接收服务或网络都有问题，但我不知道是什么错，因为调用相同的卷曲的网址很好。
我试图通过在本地使用async http客户端（播放用于它的WS接口）来解决问题并获得相同的错误，curl工作，使用javas URL-api也可以。此外，当我使用JDKAsyncHttpProvider作为http提供程序时，它也可以正常工作。
try {
AsyncHttpClientConfig cf = new AsyncHttpClientConfig.Builder().build();
// works if I use JDKAsyncHttpProvider..
//AsyncHttpClient asyncHttpClient = new AsyncHttpClient(new JDKAsyncHttpProvider(cf));
AsyncHttpClient asyncHttpClient = new AsyncHttpClient(cf);
Future<Response> f = asyncHttpClient.prepareGet(nw).execute();
Response r = f.get();
System.out.println(r.getResponseBody());
} catch(Exception e) {
e.printStackTrace();
}
由于我正在使用Play框架，因此我无法更改提供程序。
我目前卡住了，我要求指出问题可能是什么，或者是我调试的下一步。
更新：所有调试选项都出现以下错误：
Extension ec_point_formats, formats: [uncompressed]
***
[write] MD5 and SHA1 hashes: len = 149
0000: 01 00 00 91 03 01 53 AD 17 DD 91 78 24 7E 9A 58 ......S....x$..X
0010: 0E CA D9 ED 22 5A A9 DF 3F 4C DD 25 58 E1 E6 C1 ...."Z..?L.%X...
0020: 4C 63 3E 11 78 1E 00 00 2A C0 09 C0 13 00 2F C0 Lc>.x...*...../.
0030: 04 C0 0E 00 33 00 32 C0 07 C0 11 00 05 C0 02 C0 ....3.2.........
0040: 0C C0 08 C0 12 00 0A C0 03 C0 0D 00 16 00 13 00 ................
0050: 04 00 FF 01 00 00 3E 00 0A 00 34 00 32 00 17 00 ......>...4.2...
0060: 01 00 03 00 13 00 15 00 06 00 07 00 09 00 0A 00 ................
0070: 18 00 0B 00 0C 00 19 00 0D 00 0E 00 0F 00 10 00 ................
0080: 11 00 02 00 12 00 04 00 05 00 14 00 08 00 16 00 ................
0090: 0B 00 02 01 00 .....
New I/O worker #2, WRITE: TLSv1 Handshake, length = 149
[Raw write]: length = 154
0000: 16 03 01 00 95 01 00 00 91 03 01 53 AD 17 DD 91 ...........S....
0010: 78 24 7E 9A 58 0E CA D9 ED 22 5A A9 DF 3F 4C DD x$..X...."Z..?L.
0020: 25 58 E1 E6 C1 4C 63 3E 11 78 1E 00 00 2A C0 09 %X...Lc>.x...*..
0030: C0 13 00 2F C0 04 C0 0E 00 33 00 32 C0 07 C0 11 .../.....3.2....
0040: 00 05 C0 02 C0 0C C0 08 C0 12 00 0A C0 03 C0 0D ................
0050: 00 16 00 13 00 04 00 FF 01 00 00 3E 00 0A 00 34 ...........>...4
0060: 00 32 00 17 00 01 00 03 00 13 00 15 00 06 00 07 .2..............
0070: 00 09 00 0A 00 18 00 0B 00 0C 00 19 00 0D 00 0E ................
0080: 00 0F 00 10 00 11 00 02 00 12 00 04 00 05 00 14 ................
0090: 00 08 00 16 00 0B 00 02 01 00 ..........
09:06:05.883 [New I/O worker #2] DEBUG c.n.h.c.p.n.NettyAsyncHttpProvider - Unexpected I/O exception on channel [id: 0x9820cfc1, /192.168.101.123:41411 => domain/148.136.157.62:443]
java.io.IOException: Connection reset by peer
TLS握手问题出现了，在调试此问题时我还可以做些什么而无法访问远程服务？
再次更新，这次收到了一条新的错误消息：
[write] MD5 and SHA1 hashes: len = 149
0000: 01 00 00 91 03 01 53 AD 1C 54 D6 57 05 7A 89 E5 ......S..T.W.z..
0010: 55 60 01 2F 48 A5 BA EB 4C E6 96 68 E7 B8 2B 67 U`./H...L..h..+g
0020: A2 4C AF C8 9D 10 00 00 2A C0 09 C0 13 00 2F C0 .L......*...../.
0030: 04 C0 0E 00 33 00 32 C0 07 C0 11 00 05 C0 02 C0 ....3.2.........
0040: 0C C0 08 C0 12 00 0A C0 03 C0 0D 00 16 00 13 00 ................
0050: 04 00 FF 01 00 00 3E 00 0A 00 34 00 32 00 17 00 ......>...4.2...
0060: 01 00 03 00 13 00 15 00 06 00 07 00 09 00 0A 00 ................
0070: 18 00 0B 00 0C 00 19 00 0D 00 0E 00 0F 00 10 00 ................
0080: 11 00 02 00 12 00 04 00 05 00 14 00 08 00 16 00 ................
0090: 0B 00 02 01 00 .....
New I/O worker #2, WRITE: TLSv1 Handshake, length = 149
[Raw write]: length = 154
0000: 16 03 01 00 95 01 00 00 91 03 01 53 AD 1C 54 D6 ...........S..T.
0010: 57 05 7A 89 E5 55 60 01 2F 48 A5 BA EB 4C E6 96 W.z..U`./H...L..
0020: 68 E7 B8 2B 67 A2 4C AF C8 9D 10 00 00 2A C0 09 h..+g.L......*..
0030: C0 13 00 2F C0 04 C0 0E 00 33 00 32 C0 07 C0 11 .../.....3.2....
0040: 00 05 C0 02 C0 0C C0 08 C0 12 00 0A C0 03 C0 0D ................
0050: 00 16 00 13 00 04 00 FF 01 00 00 3E 00 0A 00 34 ...........>...4
0060: 00 32 00 17 00 01 00 03 00 13 00 15 00 06 00 07 .2..............
0070: 00 09 00 0A 00 18 00 0B 00 0C 00 19 00 0D 00 0E ................
0080: 00 0F 00 10 00 11 00 02 00 12 00 04 00 05 00 14 ................
0090: 00 08 00 16 00 0B 00 02 01 00 ..........
Hashed wheel timer #2, called closeOutbound()
Hashed wheel timer #2, closeOutboundInternal()
Hashed wheel timer #2, SEND TLSv1 ALERT: warning, description = close_notify
Hashed wheel timer #2, WRITE: TLSv1 Alert, length = 2
Hashed wheel timer #2, called closeInbound()
Hashed wheel timer #2, fatal error: 80: Inbound closed before receiving peer's close_notify: possible truncation attack?
javax.net.ssl.SSLException: Inbound closed before receiving peer's close_notify: possible truncation attack?
Hashed wheel timer #2, SEND TLSv1 ALERT: fatal, description = internal_error
Hashed wheel timer #2, Exception sending alert: java.io.IOException: writer side was already closed.
已更新，已解决：
远程主机将https-certificate配置为使用服务器名称指示，SNI导致网络提供程序失败。我想netty提供商还不支持SNI。
答案 0 :(得分：2)
当您说“SSL加密域”时，您的意思是HTTPS？
如果是这样，您可以使用WS SSL中的调试功能：http://www.playframework.com/documentation/2.3.x/DebuggingSSL
或直接用-Djavax.net.debug=all设置JSSE的调试标志。
另外，在application.conf中打开logger.play.api.libs.ws=DEBUG和logger.org.asynchttpclient=DEBUG以获得最大的详细程度。
如果您愿意直接使用AsyncHttpClient，也可以直接更改提供程序，而无需通过WS。这意味着您可能不得不在onSuccess（）回调中使用Promise，但是您创建了一个类似WS的有限接口，如果这是一个问题，它将返回Future。
答案 1 :(得分：0)
我遇到了同样的问题。我能够通过从Java 6切换到Java 7来解决它。这是Java 6中不支持服务器名称指示（SNI）的问题，但在Java 7中受支持。