Azure AI Content Safety
An Azure service that enables users to identify content that is potentially offensive, risky, or otherwise undesirable. Previously known as Azure Content Moderator.
41 questions
Azure content safety not reading from presigned Url
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Sayan Manna
0
Reputation points
I have a content safety resource which works fine when request with any open url.
The problem is when I give a presigned URL (s3) with read access (opening in browser). Azure content safety is returning not able to connect to blob. Please help if anyone have faced and fixed the same issue.
Response :
{"error":{"code":"InvalidRequestBody","message":"Failed to connect to the blob. | Request Id: addb177e-9c47-4700-b869-2bd99116250b, Timestamp: 2025-04-15T08:43:12Z.","details":[]}}
{count} votes
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SriLakshmi C 4,390 Reputation points Microsoft External Staff2025-04-15T14:56:50.4366667+00:00 Hello @Sayan Manna,
There are several possible reasons why Azure Content Safety may be unable to access a pre-signed S3 URL, even if it works correctly in a browser.
Azure may not be able to resolve the S3 URL due to region-specific configurations or special headers that browsers handle automatically but Azure services do not.
Pre-signed URLs are time-sensitive, and if the signature has expired or the timestamp is slightly off, the request can fail silently without a clear error.
HTTP redirects some S3 URLs automatically redirect to region-specific endpoints, which Azure services might not follow properly.
CORS policies or firewall rules might block access for programmatic requests, even if the URL is accessible via a web browser. These restrictions can include IP-based limitations or origin checks that prevent services like Azure Content Safety from retrieving the file.
Here are a few things to check:
Ensure that the presigned URL has valid read permissions and is not expired. It's essential that the URL uses HTTPS and is properly formatted extra parameters or incorrect query strings can sometimes cause access issues. You can validate the URL using tools like curl or Postman (not just a browser) to confirm it's accessible without additional headers or authentication. Also, verify that it’s specifically a GET presigned URL, as other methods may not be compatible with Azure's service.
If the URL appears to be configured correctly but the issue persists, consider switching to direct file upload. Azure Content Safety supports sending files directly in the request body, which avoids potential access issues caused by private storage permissions. This approach is particularly reliable when dealing with secure or time-sensitive files.
As another alternative, if the file content is not sensitive, you may temporarily host it publicly for example, using Azure Blob Storage or a public S3 bucket for the purpose of scanning.
For users already working within Azure, using Azure Blob Storage with a SAS (Shared Access Signature) token is a more native and compatible method. SAS tokens provide fine-grained access control and work well with Azure Content Safety APIs.
Please refer this https://stackoverflow.com/questions/55233010/azure-blob-storage-pre-signed-url-features
I Hope it helps. Do let me know if you have further queries.
Thank you.
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santoshkc 14,260 Reputation points Microsoft External Staff2025-04-16T14:15:55.14+00:00 Hi @Sayan Manna,
Just checking in to see if the above response provided by @SriLakshmi C helped. And, if you have any further query do let us know.
Thank you.
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SriLakshmi C 4,390 Reputation points Microsoft External Staff
2025-04-17T09:33:56.3866667+00:00 We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Thank you!
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