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When working with Amazon S3, you might notice that the Content-Type isn’t showing up in the user_metadata section of your inventory tables. This is because Content-Type is considered system metadata, not user-defined metadata.
In simpler terms, Amazon S3 sorts metadata into two categories. First, there is system-defined metadata, which includes important properties like Content-Type, file size, and the last modified date. Second, there is user-defined metadata, which consists of custom key-value pairs that you add when uploading objects.
The user_metadata part of the inventory table only shows the custom key-value pairs you specify. It doesn’t include system metadata like Content-Type by default. This separation is intentional to keep system information separate from user data.
Content-Type is managed separately by Amazon S3 as part of the HTTP headers. While you can see the Content-Type information by using the HeadObject API or through the S3 Console, it isn’t visible in the user_metadata column of your inventory tables.
If you want to find out the Content-Type of objects regularly, you should keep using the HeadObject API or other content management solutions. The inventory tables are great for viewing custom metadata and object properties but aren’t designed to include all system metadata like Content-Type.
So, for your current needs, the S3 inventory table might not be the best tool to see Content-Type details. Instead, stick with the API calls or other methods for content-related information.
Sources:
- S3ObjectMetadata – Amazon S3
- S3 Metadata live inventory tables schema
- AWS re:Post on S3 metadata visibility
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