How do I extract "eTag" or "x-ms-request-id" from my Azure Storage response?

Question

The Azure table whitepaper mentions that the x-ms-request-id is useful to send to Microsoft in the event there is an error working with the data. If I do have such an error, I'd like my try...catch block to take this and save it somewhere for future analysis.

How do I extract this information and have it available when the Exception comes around?

HTTP/1.1 204 No Content
Content-Length: 0
ETag: W/"datetime'2008-10-01T15%3A27%3A34.4838174Z'"
x-ms-request-id: 7c1b5e22-831d-403c-b88a-caa4443e75cb

Answer 1

Depends on your client implementation, but they are all HTTP 1.1 headers.

For example, ( Assuming .NET WebRequest Class ) something like:

WebRequest request = WebRequest.Create("http://myazurestore.server.com");

....

WebResponse response = request.GetResponse();

string mSRequestId = response.Headers["x-ms-request-id"];

Would work

EDIT(for Storage Client Lib) ...

If you are using the Client library, you can get at ETag from the Properties collection on CloudBlob

So ..

Cloudblob blob = container.GetBlobReference("blobname.ext");

var eTag = blob.Properties.ETag

Properties is a blobProperties object. It should provide access to most of the needed data.

MSDN: http://msdn.microsoft.com/en-us/library/microsoft.windowsazure.storageclient.blobproperties_members.aspx