The specified resource name contains invalid characters Error generating SAS url for blob even though blob name is valid

Question

I'm trying to create an Sas Url for a blob through a web api but i keep getting this error. I've used this blog post as a reference but changed some things i don't need. (I've tried doing exactly as the post says, copy pasted, still doesn't work)

this is my code:

var container = _blobServiceClient.GetBlobContainerClient("Files");
var client = container.GetBlobClient("dev-test/test-json.txt");
// I've tried to use just the name of the blob without the file extension and that doesn't work either

if (!client.CanGenerateSasUri)
   return string.Empty;

var builder = new BlobSasBuilder
     {
         BlobContainerName = container.Name,
         BlobName = client.Name,
         Resource = "b",
         StartsOn = DateTime.UtcNow,
         ExpiresOn = DateTime.UtcNow.AddDays(1),
         Protocol = SasProtocol.Https
     };

builder.SetPermissions(BlobSasPermissions.Read);

Uri sasUri = client.GenerateSasUri(builder);
string url = sasUri.ToString();
return await Task.FromResult(url);

i get a url that seems to be fine according to examples I've seen but when i try to access that url i get the error mentioned in the title.

when i use Generate SAS inside the azure container itself, it's working fine. but through my code it doesn't.

this is the token i get from the azure blob when i click Generate SAS:

sp=r&st=2022-06-12T21:00:00Z&se=2022-06-13T21:00:00Z&spr=https&sv=2021-06-08&sr=b&sig=2RhYyiWMGQxzidNQgsVFaiNJRDhRCKmHkQRnHM3x7J8%3D

this is the token i get through the api request:

sv=2021-06-08&spr=https&st=2022-06-13T11%3A13%3A56Z&se=2022-06-14T11%3A13%3A56Z&sr=b&sp=r&sig=1Ttgdeti6NC8vcINmCNBQL7ejdE0ajNHhJRGAdGNANg%3D

container name is Files and the blob is in dev-test folder and the file name is test-json — Dror Cohen
– Dror Cohen, Commented Jun 13, 2022 at 11:37
Ok, through your question i realized what the problem was. the container name should be lower case as well. Thanks for you help! — Dror Cohen
– Dror Cohen, Commented Jun 13, 2022 at 11:41

Dror Cohen · Accepted Answer · 2022-06-13 11:42:41Z

2

Container name should be lowercase as well

var container = _blobServiceClient.GetBlobContainerClient("files");

answered Jun 13, 2022 at 11:42

Dror Cohen

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