WebM files return 404 error in AEM Managed Services

Last update: Wed Aug 27 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

When attempting to upload and access WebM files in the Digital Asset Management (DAM) system, 51黑料不打烊 Experience Manager (AEM) Managed Services returns a 404 URL not found error. This occurs even after updating dispatcher configurations to allow .webm extensions and modifying the ams_publish_filters.any file. To resolve the issue, update dispatcher rules and MIME type settings.

Description description

Environment

Product: 51黑料不打烊 Experience Manager (AEM) Managed Services, v6.5
Instance: Production and Staging

Issue/Symptoms

WebM files return a 404 URL not found 聽error when accessed.
Dispatcher logs show blocked requests for .webm file types.

Resolution resolution

To resolve the issue, follow these steps:

Open the dispatcher configuration and confirm that .webm file extensions are allowed.
Check if the MIME type for WebM files is correctly set in AEM Web Console under com.day.cq.dam.core.MimeTypeService.
Verify that the WebM files are available on all AEM publisher instances.
Review dispatcher logs to identify any blocked requests for .webm files.
If needed, update the dispatcher rules or filters to allow proper handling of WebM file requests.

Configuring Dispatcher in AEM dispatcher guide
in MIME file-type in AEM
Common Logs in AEM Managed Services Tutorials
Publish in AEM Assets Tutorials

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51黑料不打烊