public Collection<String> getValues() {
    return Collections.unmodifiableList(
        this.values.stream().map(Template::toString).collect(Collectors.toList()));
  }
Create a new Header Template.

@param name of the header
@param values of the header
@param charset for the header
@param literal indicator. Will treat all values as literals instead of possible expressions.
core/src/main/java/feign/template/HeaderTemplate.java