default HttpData withEndOfStream() {
        return withEndOfStream(true);
    }
Returns the {@link HttpData} that has the same content with this data and its HTTP/2 {@code endOfStream}
flag set. If this data already has {@code endOfStream} set, {@code this} will be returned.
core/src/main/java/com/linecorp/armeria/common/HttpData.java