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502 error accessing any cloud storage object, bucket is public

I have a single cloud storage bucket with 10,000+ objects, all JPG images.  If I try to access any via their public URL, it fails with a 502 error.

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The bucket access control is uniform, no abject-level ACLs.  The bucket is readable for public via allUsers for both the legacy object reader and storage object viewer.

 

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For any image, the public URL returns the 502 error. The Authenticated URL actually does work.  Public access used to work for the objects in the past, but at some point it started returning the 502 error.  The images were uploaded from a .net application using the cloud storage API.

 

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Do we have permissions set wrong?  I updated the bucket access a few days ago to re-apply the uniform access, and re-added the allUsers permission to make sure it's in effect.

 

 

 

 

 

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