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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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# 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.

$rest = New-Object Chilkat.Rest

# Connect to the Azure Storage Blob Service
$bTls = $true
$port = 443
$bAutoReconnect = $true
# In this example, the storage account name is "chilkat".
$success = $rest.Connect("chilkat.blob.core.windows.net",$port,$bTls,$bAutoReconnect)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

# Provide Azure Cloud credentials for the REST call.
$azAuth = New-Object Chilkat.AuthAzureStorage
$azAuth.AccessKey = "AZURE_ACCESS_KEY"
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
$azAuth.Account = "chilkat"
$azAuth.Scheme = "SharedKey"
$azAuth.Service = "Blob"
# This causes the "x-ms-version: 2021-08-06" header to be automatically added.
$azAuth.XMsVersion = "2021-08-06"
$success = $rest.SetAuthAzureStorage($azAuth)

# 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.
$success = $rest.AddHeader("Origin","www.contoso.com")
# The Access-Control-Request-Method is the HTTP method (such as GET, POST, PUT, etc.) of the actual request.
$success = $rest.AddHeader("Access-Control-Request-Method","PUT")

# 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.)
$responseStr = $rest.FullRequestNoBody("OPTIONS","/test")
if ($rest.LastMethodSuccess -ne $true) {
    $($rest.LastErrorText)
    exit
}

# 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.ResponseStatusCode -ne 200) {
    # Examine the request/response to see what happened.
    $("response status code = " + $rest.ResponseStatusCode)
    $("response status text = " + $rest.ResponseStatusText)
    $("response header: " + $rest.ResponseHeader)
    $("response body (if any): " + $responseStr)
    $("---")
    $("LastRequestStartLine: " + $rest.LastRequestStartLine)
    $("LastRequestHeader: " + $rest.LastRequestHeader)
    exit
}

$("Success: Preflight Blob Request is accepted.")