I'm trying to drop messages on an Azure message queue for processing.  I have been able to build the HttpRequest, but am receiving a 403 - failed to authenticate message from Azure when calling the REST API.  I am using the following code:

string storageKey = 'removedforprivacy';

    Datetime dt = Datetime.now();
    string formattedDate = dt.formatGMT('EEE, dd MMM yyyy HH:mm:ss') + ' UTC';
    string stringToSign = 'POST\n\napplication/xml\n\nx-ms-date:' + formattedDate + '\n' +
                                      '/myqueue/testqueue/messages';

    // Sign the request
    Blob temp = EncodingUtil.base64Decode(storageKey);
    Blob hmac = Crypto.generateMac('HMacSHA256', Blob.valueOf(stringToSign), temp);
    string signature = EncodingUtil.base64Encode(hmac);
    Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign))));

    // This ends up being the exact same as the console app
    system.debug('SIGNATURE==>SharedKey myqueue:' + signature);

    HttpRequest req = new HttpRequest();
    req.setMethod('POST');
    req.setHeader('content-type', 'application/xml');
    req.setHeader('x-ms-date', formattedDate);
    string authHeader = 'SharedKey myqueue:' + signature;
    req.setHeader('Authorization', authHeader);

    req.setEndpoint('https://myqueue.queue.core.windows.net/testqueue/messages');

    req.setBody('<QueueMessage><MessageText>' + EncodingUtil.base64Encode(Blob.valueOf('This is a test from salesforce')) + '</MessageText></QueueMessage>');

    system.debug(req);

    Http http = new Http();

    try
    {
        HTTPResponse res = http.send(req);

        system.debug(res.toString());
        system.debug(res.getStatus());
        system.debug(res.getStatusCode());

    }
    catch (system.CalloutException ce)
    {
        system.debug(ce);
    }

I created a small .NET console app to verify how to create the request and the connectivity.  Once that was working, I verified the signed signature used in the Authorization header is the same when created both in .NET and in Salesforce.  Has anyone else came across this?  Is there something you can see in the code I have written?  Is there a way for me to capture the HttpRequest that is being posted by Salesforce (something similar to fiddler would be great)?

I'm trying to drop messages on an Azure message queue for processing.  I have been able to build the HttpRequest, but am receiving a 403 - failed to authenticate message from Azure when calling the REST API.  I am using the following code:

string storageKey = 'removedforprivacy';

    Datetime dt = Datetime.now();
    string formattedDate = dt.formatGMT('EEE, dd MMM yyyy HH:mm:ss') + ' UTC';
    string stringToSign = 'POST\n\napplication/xml\n\nx-ms-date:' + formattedDate + '\n' +
                                      '/myqueue/testqueue/messages';

    // Sign the request
    Blob temp = EncodingUtil.base64Decode(storageKey);
    Blob hmac = Crypto.generateMac('HMacSHA256', Blob.valueOf(stringToSign), temp);
    string signature = EncodingUtil.base64Encode(hmac);
    Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign))));

    // This ends up being the exact same as the console app
    system.debug('SIGNATURE==>SharedKey myqueue:' + signature);

    HttpRequest req = new HttpRequest();
    req.setMethod('POST');
    req.setHeader('content-type', 'application/xml');
    req.setHeader('x-ms-date', formattedDate);
    string authHeader = 'SharedKey myqueue:' + signature;
    req.setHeader('Authorization', authHeader);

    req.setEndpoint('https://myqueue.queue.core.windows.net/testqueue/messages');

    req.setBody('<QueueMessage><MessageText>' + EncodingUtil.base64Encode(Blob.valueOf('This is a test from salesforce')) + '</MessageText></QueueMessage>');

    system.debug(req);

    Http http = new Http();

    try
    {
        HTTPResponse res = http.send(req);

        system.debug(res.toString());
        system.debug(res.getStatus());
        system.debug(res.getStatusCode());

    }
    catch (system.CalloutException ce)
    {
        system.debug(ce);
    }

I created a small .NET console app to verify how to create the request and the connectivity.  Once that was working, I verified the signed signature used in the Authorization header is the same when created both in .NET and in Salesforce.  Has anyone else came across this?  Is there something you can see in the code I have written?  Is there a way for me to capture the HttpRequest that is being posted by Salesforce (something similar to fiddler would be great)?