rest-assured/src/main/java/io/restassured/specification/ProxySpecification.java
public ProxySpecification withHost(String host) {
        return new ProxySpecification(host, port, scheme, username, password);
    }
public ProxySpecification withHost(String host) {
        return new ProxySpecification(host, port, scheme, username, password);
    }
Specify the hostname of the proxy.

@param host The hostname of the proxy.
@return A new ProxySpecification instance