GroupDoc Conversion - Rest API parameters

I am having a technical question. I am trying to use the Groupdosc REST API to do the conversion of HTML file to DOCX (Without the storage) and seems like API accepts the physical file path as the input. Due to the security reason, we cannot open the physical file access via public URL. So, is there any other means of providing the input to the API. Do you have any Java example about how to consume this service?

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