core/auth/src/main/java/software/amazon/awssdk/auth/credentials/internal/Ec2MetadataConfigProvider.java [57:112]:
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    public enum EndpointMode {
        IPV4,
        IPV6,
        ;

        public static EndpointMode fromValue(String s) {
            if (s == null) {
                return null;
            }

            for (EndpointMode value : EndpointMode.values()) {
                if (value.name().equalsIgnoreCase(s)) {
                    return value;
                }
            }

            throw new IllegalArgumentException("Unrecognized value for endpoint mode: " + s);
        }
    }

    public String getEndpoint() {
        String endpointOverride = getEndpointOverride();
        if (endpointOverride != null) {
            return endpointOverride;
        }

        EndpointMode endpointMode = getEndpointMode();
        switch (endpointMode) {
            case IPV4:
                return EC2_METADATA_SERVICE_URL_IPV4;
            case IPV6:
                return EC2_METADATA_SERVICE_URL_IPV6;
            default:
                throw SdkClientException.create("Unknown endpoint mode: " + endpointMode);
        }
    }

    public EndpointMode getEndpointMode() {
        Optional<String> endpointMode = SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT_MODE.getNonDefaultStringValue();
        if (endpointMode.isPresent()) {
            return EndpointMode.fromValue(endpointMode.get());
        }

        return configFileEndpointMode().orElseGet(() ->
                EndpointMode.fromValue(SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT_MODE.defaultValue()));
    }

    public String getEndpointOverride() {
        Optional<String> endpointOverride = SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT.getNonDefaultStringValue();
        if (endpointOverride.isPresent()) {
            return endpointOverride.get();
        }

        Optional<String> configFileValue = configFileEndpointOverride();

        return configFileValue.orElse(null);
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core/regions/src/main/java/software/amazon/awssdk/regions/internal/util/Ec2MetadataConfigProvider.java [49:104]:
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    public enum EndpointMode {
        IPV4,
        IPV6,
        ;

        public static EndpointMode fromValue(String s) {
            if (s == null) {
                return null;
            }

            for (EndpointMode value : EndpointMode.values()) {
                if (value.name().equalsIgnoreCase(s)) {
                    return value;
                }
            }

            throw new IllegalArgumentException("Unrecognized value for endpoint mode: " + s);
        }
    }

    public String getEndpoint() {
        String endpointOverride = getEndpointOverride();
        if (endpointOverride != null) {
            return endpointOverride;
        }

        EndpointMode endpointMode = getEndpointMode();
        switch (endpointMode) {
            case IPV4:
                return EC2_METADATA_SERVICE_URL_IPV4;
            case IPV6:
                return EC2_METADATA_SERVICE_URL_IPV6;
            default:
                throw SdkClientException.create("Unknown endpoint mode: " + endpointMode);
        }
    }

    public EndpointMode getEndpointMode() {
        Optional<String> endpointMode = SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT_MODE.getNonDefaultStringValue();
        if (endpointMode.isPresent()) {
            return EndpointMode.fromValue(endpointMode.get());
        }

        return configFileEndpointMode().orElseGet(() ->
                EndpointMode.fromValue(SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT_MODE.defaultValue()));
    }

    public String getEndpointOverride() {
        Optional<String> endpointOverride = SdkSystemSetting.AWS_EC2_METADATA_SERVICE_ENDPOINT.getNonDefaultStringValue();
        if (endpointOverride.isPresent()) {
            return endpointOverride.get();
        }

        Optional<String> configFileValue = configFileEndpointOverride();

        return configFileValue.orElse(null);
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