@UnstableApi
    public ContentTooLargeExceptionBuilder cause(Throwable cause) {
        requireNonNull(cause, "cause");
        this.cause = cause;
        return this;
    }
Sets the {@link Throwable} that caused this {@link ContentTooLargeException} to get thrown.
core/src/main/java/com/linecorp/armeria/common/ContentTooLargeExceptionBuilder.java