[BUG] Azure Blob Upload Fails with 501 Not Implemented in Floci Azure Emulator

[BitsAndStack]

Description

I am using the Floci Azure Emulator (floci/floci-az:latest) to test Azure Blob Storage locally. The container starts successfully, and I can connect to the emulator, but uploading a blob fails with a 501 Not Implemented error.

Environment
Floci Azure Emulator: floci/floci-az:latest
Docker Compose
.NET 8
Azure.Storage.Blobs 12.29.1
Windows 11
Docker Compose Configuration
services:
floci-az:
image: floci/floci-az:latest
ports:
- "4577:4577"
volumes:
- ./data:/app/data
Blob Upload Code
await blobClient.UploadAsync(stream, overwrite: true);
Exception
Azure.RequestFailedException:
The requested operation is not implemented.

Status: 501 (Not Implemented)
ErrorCode: NotImplemented

Content:

NotImplemented The requested operation is not implemented.

Headers:
Date: Tue, 11 Aug 2026 15:37:50 GMT
x-ms-error-code: NotImplemented
x-ms-request-id: ebf6b3e5-b521-4ae5-9d7f-899962f13cee
x-ms-version: 2026-06-06
Content-Length: 142
Content-Type: application/xml
Stack Trace
Azure.Storage.Blobs.BlockBlobRestClient.UploadAsync
Azure.Storage.Blobs.Specialized.BlockBlobClient.UploadInternal
Azure.Storage.PartitionedUploader`2.UploadInternal
Azure.Storage.Blobs.BlobClient.StagedUploadInternal

BlobStorageDemo.Service.BlobStorageService.UploadAsync
BlobStorageService.cs: line 46
Expected Behavior

The blob should be uploaded successfully to the configured container in the local Azure Storage emulator.

Actual Behavior

The upload request reaches the emulator but returns:

501 Not Implemented
ErrorCode: NotImplemented
Questions
Is Blob Storage upload currently supported in the latest Floci Azure Emulator?
Are there any required configuration changes for Blob Storage support?
Is the Put Blob operation implemented, or is it still under development?

Any guidance would be appreciated.

[github-actions]

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