static HttpHeaders of(CharSequence name1, String value1,
                          CharSequence name2, String value2) {
        return builder().add(name1, value1)
                        .add(name2, value2)
                        .build();
    }
Returns a new {@link HttpHeaders} with the specified headers.
core/src/main/java/com/linecorp/armeria/common/HttpHeaders.java