File Metadata Attributes

You can define metadata attributes for each file that you host with MongoDB Realm. Metadata attributes map to standard HTTP headers and allow you to optionally configure how Realm serves your files as well as how clients that request resources should handle them. This page provides examples and describes the purpose of each available attribute.

The Content-Type file attribute indicates the media type of the file.


If you do not specify a Content-Type attribute for a file, Realm will attempt to automatically add a Content-Type attribute to it based on the file extension.

For example, Realm would automatically add the attribute Content-Type: application/html to the file myPage.html.

Content-Type: application/html

The Content-Disposition file attribute indicates to client applications (such as your web browser) whether the file should be downloaded as an attachment or displayed inline as a web page.

Content-Disposition: inline
Content-Disposition: attachment
Content-Disposition: attachment; filename="myFile.txt"

The Content-Encoding file attribute indicates any encodings that were applied to the file. Client applications can use this header to determine how to properly decode the file.

Content-Encoding: identity
Content-Encoding: gzip
Content-Encoding: gzip, identity

The Content-Language file attribute optionally specifies the language used by the file's intended target audience. This attribute does not necessarily represent the language that file is actually written in.

Content-Language: en-US
Content-Language: en-US, en-CA, en-UK

The Cache-Control file attribute instructs CDN servers on how they should handle cached copies of the file.

Cache-Control: max-age=300
Cache-Control: no-cache
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On this page

  • Overview
  • Content-Type
  • Content-Disposition
  • Content-Encoding
  • Content-Language
  • Cache-Control