Equivalent to -Dhttp.proxyHost, -Dhttp.proxyPort and -Dhttp.nonProxyHosts to configure forward proxy

[johanHenix]

Hello,

I am migrating a service from Spring Boot to Micronaut 3.8.7 , aiming to deploy it as a native image using GraalVM, the main purpose is to reduce memory usage.
In the previous version running with Sprint Boot, we used to configure a forward proxy using system properties http.proxyHost, http.proxyPort and http.nonProxyHosts. It was simple and efficient. But launching Micronaut service using the injected HttpClient, such system properties seem to be ignored.

Micronaut documentation indicates

The regular HttpClient API is designed around simplifying message exchange and is not designed for proxying requests. For this case, use the ProxyHttpClient, which can be used from a HTTP Server Filter to proxy requests to backend Microservices.

I tried to use a ClientFilter in order to mutate the outgoing request and change its URI but it seems we cannot change the host nor the port, although we can change the path, parameters and headers.

Is there a solution to take these proxy system properties into account when runing a Micronaut service ? Or is there a workaround to replace this behaviour ?
Would it be possible to have this behaviour with a generated native image ?

[graemerocher]

There is some configuration options for proxies https://docs.micronaut.io/latest/guide/configurationreference.html#io.micronaut.http.client.DefaultHttpClientConfiguration you could write something that automatically configured these based on the values passed in these system properties.

[johanHenix]

Hello, thank you for your answer.
Unfortunately I did not succeed to configure my service.

To give a simplified example, I launch my Spring service using command line :
java -jar -Dspring-boot.run.jvmArguments=-Dhttp.proxyHost=localhost -Dhttp.proxyPort=8080 myservice.jar and I am searching a way to do this with a micronaut service.

I tried
mvn mn:run -Dmicronaut.http.client.proxy-address=http://localhost:8080 -Dmicronaut.http.client.proxy-type=http but I receive an Internal Server Error with status 500 :
Caused by: io.netty.handler.proxy.HttpProxyHandler$HttpProxyConnectException: http, none, localhost/127.0.0.1:8080 => targetHost:8081, status: 500 Internal Server Error
Full stack is:

Caused by: io.netty.handler.proxy.HttpProxyHandler$HttpProxyConnectException: http, none, localhost/127.0.0.1:8080 => targetHost:8081, status: 500 Internal Server Error
        at io.netty.handler.proxy.HttpProxyHandler.handleResponse(HttpProxyHandler.java:200)
        at io.netty.handler.proxy.ProxyHandler.channelRead(ProxyHandler.java:257)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
        at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
        at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
        at io.netty.handler.proxy.HttpProxyHandler$HttpClientCodecWrapper.channelRead(HttpProxyHandler.java:272)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

My proxy server configuration remained the same in both cases.
Am I using proxy options right ?