I'm running into issues using the Azure Storage C# client inside my MVC app, both locally and inside an Azure App Service. I'm using the client as follows in both the console and MVC5 applications:
var account = CloudStorageAccount.Parse("connectionstring");
var client = account.CreateCloudBlobClient();
var container = client.GetContainerReference("containername");
var blob = container.GetBlockBlobReference("somefile");
var exists = blob.Exists();
I'm using the exact same values for all parameters. The Exists call works fine in the console app but returns an exception in the MVC5 application:
[WebException: The remote server returned an error: (403) Forbidden.]
After inspecting both requests produced by the client using Fiddler it shows the following requests/responses.
Console app request:
HEAD <url> HTTP/1.1
User-Agent: Azure-Storage/8.3.0 (.NET CLR 4.0.30319.42000; Win32NT 6.2.9200.0)
x-ms-version: 2017-04-17
x-ms-client-request-id: 6d51e6c2-fb3f-48fd-ade5-2031d593b553
x-ms-date: Thu, 10 Aug 2017 07:35:52 GMT
Authorization: SharedKey <creds>
Host: <host>
Connection: Keep-Alive
Console app response:
HTTP/1.1 200 OK
Content-Length: 3992
Content-Type: image/gif
Content-MD5: Ehfh+rzNrbvTgIEh9gQgfw==
Last-Modified: Tue, 27 Jun 2017 13:48:41 GMT
Accept-Ranges: bytes
ETag: "0x8D4BD6338BAED01"
Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
x-ms-request-id: d7b7e17e-0001-003e-7bab-11987d000000
x-ms-version: 2017-04-17
x-ms-lease-status: unlocked
x-ms-lease-state: available
x-ms-blob-type: BlockBlob
x-ms-server-encrypted: false
Date: Thu, 10 Aug 2017 07:35:51 GMT
MVC5 request:
HEAD <url> HTTP/1.1
User-Agent: Azure-Storage/8.3.0 (.NET CLR 4.0.30319.42000; Win32NT 10.0.15063.0)
x-ms-version: 2017-04-17
x-ms-client-request-id: 138d3edc-a3b1-48c6-b268-6b878a4c01fd
x-ms-date: Thu, 10 Aug 2017 07:33:46 GMT
Authorization: SharedKey <creds>
Host: <host>
x-ms-request-root-id: ef1cb29-49a22f2b3f72be30
x-ms-request-id: |ef1cb29-49a22f2b3f72be30.
Request-Id: |ef1cb29-49a22f2b3f72be30.
MVC5 response:
HTTP/1.1 403 Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
Transfer-Encoding: chunked
Server: Microsoft-HTTPAPI/2.0
x-ms-request-id: 106917c2-0001-00b8-2aaa-11ccaf000000
Date: Thu, 10 Aug 2017 07:33:45 GMT
Both applications are targeting .NET 4.5.2 and are using version 8.3.0 of the WindowsAzure.Storage package. I also tried version 8.2.1 and 6.2.1 but ran into the same problem.
Why would these two applications produce different HEAD requests when the code and values are exactly the same?