今天在学习springcloud时，学习到gateway访问外网，出现错误，报错内容为

[13c3884d] There was an unexpected error (type=Internal Server Error, status=500).

Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty

java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at sun.security.ssl.Handshaker.checkThrown(Handshaker.java:1475) Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: Error has been observed at the following site(s): |_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain] |_ checkpoint ⇢ HTTP GET "/guoji" [ExceptionHandlingWebHandler] Stack trace: at sun.security.ssl.Handshaker.checkThrown(Handshaker.java:1475) at sun.security.ssl.SSLEngineImpl.checkTaskThrown(SSLEngineImpl.java:552) at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:830) at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:798) at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:626) at io.netty.handler.ssl.SslHandler$SslEngineType$3.unwrap(SslHandler.java:280) at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1332) at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1227) at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1274) at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:503) at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:442) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:281) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:90) at sun.security.validator.Validator.getInstance(Validator.java:179) at sun.security.ssl.X509TrustManagerImpl.getValidator(X509TrustManagerImpl.java:312) at sun.security.ssl.X509TrustManagerImpl.checkTrustedInit(X509TrustManagerImpl.java:171) at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:239) at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:136) at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1513) at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:215) at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1024) at sun.security.ssl.Handshaker$1.run(Handshaker.java:959) at sun.security.ssl.Handshaker$1.run(Handshaker.java:956) at java.security.AccessController.doPrivileged(Native Method) at sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1415) at io.netty.handler.ssl.SslHandler.runAllDelegatedTasks(SslHandler.java:1502) at io.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1516) at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1400) at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1227) at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1274) at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:503) at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:442) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:281) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:745) Caused by: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at java.security.cert.PKIXParameters.setTrustAnchors(PKIXParameters.java:200) at java.security.cert.PKIXParameters.<init>(PKIXParameters.java:120) at java.security.cert.PKIXBuilderParameters.<init>(PKIXBuilderParameters.java:104) at sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:88) ... 36 more

本人的源码如下

经过个人的测试和阅读资料，找到了问题的所在.

当想要代理的外网协议为https时，将会出现安全问题，当代理的外网协议为http时，变不会出现安全问题。

https为安全的协议，不能够随意的进行外网的代理。