public ProxyConfiguration preemptiveBasicProxyAuth(boolean preemptiveBasicProxyAuth) {
        setPreemptiveBasicProxyAuth(preemptiveBasicProxyAuth);
        return this;
    }
Sets whether to attempt to authenticate preemptively against proxy servers using basic authentication.

@param preemptiveBasicProxyAuth Whether to authenticate preemptively against proxy server.
@return This object for method chaining.
aws-java-sdk-opensdk/src/main/java/com/amazonaws/opensdk/config/ProxyConfiguration.java