@Override
    default RequestHeadersBuilder set(Map<? extends CharSequence, String> entries) {
        return (RequestHeadersBuilder) HttpHeadersBuilder.super.set(entries);
    }
Adds the <a href="https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2">Accept</a>
header.
core/src/main/java/com/linecorp/armeria/common/RequestHeadersBuilder.java