@Override
    public HttpResponse toHttpResponse(HttpStatus status) {
        requireNonNull(status, "status");
        final MediaType contentType = DEFAULT_MULTIPART_TYPE.withParameter(BOUNDARY_PARAMETER, boundary);
        final ResponseHeaders responseHeaders = ResponseHeaders.builder(status)
                                                               .contentType(contentType)
                                                               .build();
        return HttpResponse.of(responseHeaders, this);
    }
Returns a random boundary used for encoding multipart messages.
core/src/main/java/com/linecorp/armeria/common/multipart/DefaultMultipart.java