HTTP client unable to specify which IP to bind to, what should I do?

[weiyouren]

Expected Behavior

bind network interface to http client

Actual Behavior

i wan to bind network interface to http client, but it not work

Steps to Reproduce

public static WebClient getWebClient(String name) {
        var provider = ConnectionProvider
                .builder(name)
                .maxConnections(4096)
                .pendingAcquireMaxCount(4096)
                //.pendingAcquireTimeout(Duration.ofSeconds(60))
                .maxIdleTime(Duration.ofSeconds(30))
                //.maxLifeTime(Duration.ofMinutes(30))
                .evictInBackground(Duration.ofSeconds(10))
                .lifo()
                .build();

        var connector = new ReactorClientHttpConnector(HttpClient.create(provider)
                .compress(true)
                .bindAddress(() -> new InetSocketAddress("192.168.0.2", 0))//not working,why?
                .protocol(HttpProtocol.H2)
                .secure()
                .keepAlive(true));

        return WebClient.builder()
                .clientConnector(connector)
                .baseUrl(BASE_URL)
                .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                .build();
    }

Possible Solution

Your Environment

• Reactor version(s) used: 1.1.10
• Other relevant libraries versions (eg. netty, ...):
• JVM version (java -version):java 17.0.8 2023-07-18 LTS
• OS and version (eg. uname -a):centos 7 x64

[weiyouren]

I have two network cards with different IP addresses，192.168.0.2 it's an example

[Violeta Georgieva]

@weiyouren Please provide the logs with the problem. I tried to bind the client, where the address was specific for my local machine, and there were no issues with binding.

[weiyouren]

I hava four network card，bindAddress(() -> new InetSocketAddress("172.31.108.179", 0))，I bind local address on eth2 ip address，but sending data is from eth3，you can see eth2 sending data is zero

but eth3 is working

[Violeta Georgieva]

@weiyouren In addition to the configuration that you have can we also specify bindAddress for Host Name resolution like this:

				// bindAddress for the client requests
				.bindAddress(() -> new InetSocketAddress("192.168.0.2", 0))//not working,why?
				// bindAddress for Host Name resolution
				.resolver(spec -> spec.bindAddressSupplier(() -> new InetSocketAddress("192.168.0.2", 0)))

Can you also provide tcp dump?

[weiyouren]

tcpdump -i eth2

tcpdump -i eth3

[Violeta Georgieva]

@weiyouren Can you provide also logs from the execution? You need to enable wiretap(true) on the HttpClient and also to enable logging for reactor.netty logger.

[Violeta Georgieva]

I cannot reproduce this issue with my setup.

[Violeta Georgieva]

@weiyouren I'm closing this with cannot reproduce. We can reopen the issue when you are able to provide the requested information.