Rust

Azure Storage: CORS Preflight Blob Request

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Azure Storage Blob Service REST API: Sample code to send a CORS pre-flight blob request. Rust

// Azure Blob Service Example: CORS Preflight Blob Request
// See also: https://msdn.microsoft.com/en-us/library/azure/dn535599.aspx

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let rest = chilkat::Rest::new();

// Connect to the Azure Storage Blob Service
let b_tls = true;
let port = 443;
let b_auto_reconnect = true;
// In this example, the storage account name is "chilkat".
if rest.connect("chilkat.blob.core.windows.net", port, b_tls, b_auto_reconnect).is_err() {
    println!("{}", rest.last_error_text());
    return;
}

// Provide Azure Cloud credentials for the REST call.
let az_auth = chilkat::AuthAzureStorage::new();
az_auth.set_access_key("AZURE_ACCESS_KEY");
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
az_auth.set_account("chilkat");
az_auth.set_scheme("SharedKey");
az_auth.set_service("Blob");
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
az_auth.set_x_ms_version("2021-08-06");
let _ = rest.set_auth_azure_storage(&az_auth).is_ok();

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// The preflight blob request requires the following two HTTP headers.
// The Origin is the domain from which the actual request will be issued.
let _ = rest.add_header("Origin", "www.contoso.com").is_ok();
// The Access-Control-Request-Method is the HTTP method (such as GET, POST, PUT, etc.) of the actual request.
let _ = rest.add_header("Access-Control-Request-Method", "PUT").is_ok();

// The expected response is a 202 response status code with no response body.
// The name of the container or blob resource in this example is "test". (Replace "test" with your container name.)
let Ok(response_str) = rest.full_request_no_body("OPTIONS", "/test") else {
    println!("{}", rest.last_error_text());
    return;
};

// When successful, the Azure Storage service will respond with a 200 response code,
// with no response body.

// If CORS is not enabled or no matching rule is found for the request, 
// then a 403 status code is returned, with the following status text:
// "CORS not enabled or no matching rule found for this request."
if rest.response_status_code() != 200 {
    // Examine the request/response to see what happened.
    println!("response status code = {}", rest.response_status_code());
    println!("response status text = {}", rest.response_status_text());
    println!("response header: {}", rest.response_header());
    println!("response body (if any): {}", response_str);
    println!("---");
    println!("LastRequestStartLine: {}", rest.last_request_start_line());
    println!("LastRequestHeader: {}", rest.last_request_header());
    return;
}

println!("Success: Preflight Blob Request is accepted.");