code: public static HttpHeader header(String name, Collection<String> values) {
  		return new HttpHeader(name, values);
  	}
docs: Create a header with multiple values.
  
  @param name Header name.
  @param values Header values, must not be empty.
  @return Header.
  @throws NullPointerException If {@code name} or one of {@code values} are {@code null}.
  @throws IllegalArgumentException If {@code name} is blank.