static HttpHeaders of(CharSequence name, Object value) {
        return builder().addObject(name, value).build();
    }
Returns a new {@link HttpHeaders} with the specified header. The value is converted into
a {@link String} as explained in <a href="#object-values">Specifying a non-String header value</a>.
core/src/main/java/com/linecorp/armeria/common/HttpHeaders.java