public ProxyConfiguration proxyDomain(String proxyDomain) {
        setProxyDomain(proxyDomain);
        return this;
    }
Sets the optional Windows domain name for configuration an NTLM proxy.
If you aren't using a Windows NTLM proxy, you do not need to set this field.

@param proxyDomain The optional Windows domain name for configuring an NTLM proxy.
@return This object for method chaining.
aws-java-sdk-opensdk/src/main/java/com/amazonaws/opensdk/config/ProxyConfiguration.java