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Specify RPC Host and Port

You can use callopt.WithHostPort to specify host and port, supports two parameters:

• Normal IP address, in the form of host:port, support IPv6
• Sock file address, communicating with UDS (Unix Domain Socket)

import "github.com/cloudwego/kitex/client/callopt"
...
resp, err := cli.Echo(context.Background(), req, callopt.WithHostPort("127.0.0.1:8888"))
if err != nil {
   log.Fatal(err)
}

Specify RPC URL

You can use callopt.WithURL to specify a URL, which will be resolved by default DNS resolver to get host and port. It’s functionally equal to callopt.WithHostPort.

import "github.com/cloudwego/kitex/client/callopt"
...
url := callopt.WithURL("http://myserverdomain.com:8888")
resp, err := cli.Echo(context.Background(), req, url)
if err != nil {
	log.Fatal(err)
}

Customized DNS resolver

You can also use your own DNS resolver

resolver interface(pkg/http)：

type Resolver interface {
	Resolve(string) (string, error)
}

The only parameter is URL，return value should be “host:port”.

You can use client.WithHTTPResolver to specify DNS resolver.

import "github.com/cloudwego/kitex/client/callopt"
...
dr := client.WithHTTPResolver(myResolver)
cli, err := echo.NewClient("echo", dr)
if err != nil {
	log.Fatal(err)
}