Azure Blob: “The condition specified using HTTP conditional header(s) is not met”

Question

I got this exception when I run my application. It happens also in the real Azure blob storage.

I\'ve caught with Fiddler the request that creates this problem:

Answer 1

You can still use OpenRead, you need to pass OperationContext instance like below code:

// cloudBlob instance of CloudPageBlob

 OperationContext context = new OperationContext();
 context.SendingRequest += (sender, e) => { 
     e.Request.Headers["if-match"] = "*";
 };

 using (AutoResetEvent waitHandle = new AutoResetEvent(false))
 {
     cloudBlob.StreamMinimumReadSizeInBytes = 16385;
     var result = cloudBlob.BeginOpenRead(null, null, context,
         ar => waitHandle.Set(),
         null);
     waitHandle.WaitOne();
     using (Stream blobStream = vhd.EndOpenRead(result))
     {
         var k = blobStream.ReadByte();
     }
 }