(Chilkat2-Python) Azure Storage: CORS Preflight Blob Request

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

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import sys
import chilkat2

# 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 = chilkat2.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 != True):
    print(rest.LastErrorText)
    sys.exit()

# Provide Azure Cloud credentials for the REST call.
azAuth = chilkat2.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 != True):
    print(rest.LastErrorText)
    sys.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 != 200):
    # Examine the request/response to see what happened.
    print("response status code = " + str(rest.ResponseStatusCode))
    print("response status text = " + rest.ResponseStatusText)
    print("response header: " + rest.ResponseHeader)
    print("response body (if any): " + responseStr)
    print("---")
    print("LastRequestStartLine: " + rest.LastRequestStartLine)
    print("LastRequestHeader: " + rest.LastRequestHeader)
    sys.exit()

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