From https://guides.micronaut.io/latest/micronaut-http-client-maven-kotlin.html

 
<dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-http-client</artifactId>
    <scope>compile</scope>
</dependency>
 
<dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-http-client-jdk</artifactId>
    <scope>compile</scope>
</dependency>

In gradle terms:

    // For Micronaut HTTP Client based on Netty
    implementation("io.micronaut:micronaut-http-client:${CommonVersionJVM.micronaut}")
 
    // For Micronaut HTTP Client based on Java HTTP Client
    implementation("io.micronaut:micronaut-http-client-jdk:${CommonVersionJVM.micronaut}")