api/java/src/main/java/com/navercorp/redis/cluster/gateway/GatewayAddress.java
public static String parseHost(final String address) {
        int ep = address.indexOf(":");
        if (ep == -1 || ep == 0) {
            throw new IllegalArgumentException("invalid address '" + address + "'");
        }
        return address.substring(0, ep).trim();
    }
public static String parseHost(final String address) {
        int ep = address.indexOf(":");
        if (ep == -1 || ep == 0) {
            throw new IllegalArgumentException("invalid address '" + address + "'");
        }
        return address.substring(0, ep).trim();
    }
Parses the host.

@param address the address
@return the string