public CreateDBProxyRequest withAuth(UserAuthConfig... auth) {
        if (this.auth == null) {
            setAuth(new com.amazonaws.internal.SdkInternalList<UserAuthConfig>(auth.length));
        }
        for (UserAuthConfig ele : auth) {
            this.auth.add(ele);
        }
        return this;
    }
<p>
The authorization mechanism that the proxy uses.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setAuth(java.util.Collection)} or {@link #withAuth(java.util.Collection)} if you want to override the
existing values.
</p>

@param auth
       The authorization mechanism that the proxy uses.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/CreateDBProxyRequest.java