@Override
    public Set<String> getAuthRequestHeaders(Context<? extends Trait> context, SigV4Trait trait) {
        return REQUEST_HEADERS;
    }
Adds AWS signature version in a way that"s compatible with AWS API Gateway.
smithy-openapi/src/main/java/software/amazon/smithy/openapi/fromsmithy/security/AwsV4Converter.java