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I am using Azure REST API and trying to put a blob. I was created a "GET" request successfully, but I am facing an issue with "PUT" request. It is throwing an 404 error. Is there any way to rectify this error?

1 Answer

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by (26.7k points)

Please find the below code, this will work for you.

void UploadBlobWithRestAPI() {

    string storageKey = "<your access key here>";

    string storageAccount = "<your storage account name here>";    

    string containerName = "<your container name here>";

    string blobName = "test.txt";

    string method = "PUT";

    string sampleContent = "This is sample text.";

    int contentLength = Encoding.UTF8.GetByteCount(sampleContent);

    string requestUri = $"https://{storageAccount}{containerName}/{blobName}";

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);

    string now = DateTime.UtcNow.ToString("R");

    request.Method = method;

    request.ContentType = "text/plain; charset=UTF-8";

    request.ContentLength = contentLength;

    request.Headers.Add("x-ms-version", "2015-12-11");

    request.Headers.Add("x-ms-date", now);

    request.Headers.Add("x-ms-blob-type", "BlockBlob");

    request.Headers.Add("Authorization", AuthorizationHeader(method, now, request, storageAccount, storageKey, containerName, blobName));

    using (Stream requestStream = request.GetRequestStream()) {

        requestStream.Write(Encoding.UTF8.GetBytes(sampleContent), 0, contentLength);


    using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse()) {




public string AuthorizationHeader(string method, string now, HttpWebRequest request, string storageAccount, string storageKey, string containerName, string blobName) {

    string headerResource = $"x-ms-blob-type:BlockBlob\nx-ms-date:{now}\nx-ms-version:2015-12-11";

    string urlResource = $"/{storageAccount}/{containerName}/{blobName}";

    string stringToSign = $"{method}\n\n\n{request.ContentLength}\n\n{request.ContentType}\n\n\n\n\n\n\n{headerResource}\n{urlResource}";

   HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(storageKey));

    string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));

    String AuthorizationHeader = String.Format("{0} {1}:{2}", "SharedKey", storageAccount, signature);

    return AuthorizationHeader;


I hope this will help.

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