The Authorization header is missing

Question

I am getting this error :{"error":{"code":"AuthenticationFailed","message":"Authentication failed. The 'Authorization' header is missing."}} whenever I am trying to test my API that is

https://management.azure.com/subscriptions/{subscriptionID}/providers/Microsoft.Compute/locations/{location}/publishers/{publisherName}/artifacttypes/vmimage/offers/{offer}/skus?api-version=2019-03-01

Can anybody suggest a solution how to set authentication header in postman or API Tester.

Answer 1

Authorization is the part of HTTP Header and generally it is token which is Base64 encoded. In Postman, you can add it by clicking on "Headers" button.

Answer 2

You need to set up and configure Postman to obtain an Azure Active Directory token.

A full walk though is covered here - screen shots below for quick reference.

From the docs - a sample token request form.

Answer 3

This is a guide to use curl to get the https://medium.com/@mauridb/calling-azure-rest-api-via-curl-eb10a06127.

You can replace the place holder to your service principal in this command.

curl -vX POST -d "grant_type=client_credentials&client_id=${spClientId}&client_secret=${spSecret}&resource=https%3A%2F%2Fmanagement.azure.com%2F" https://login.microsoftonline.com/${spTenantId}/oauth2/token)

Answer 4

An easy way to get a Bearer token in order to use for Authentication header would be to use az cli.

$token =  az account get-access-token | ConvertFrom-Json

Then by accessing $token.accesstoken you will have string as shown below.

You can use this Token then with your API call as a Bearer token

$headers = @{ Authorization = "Bearer $token.accesstoken" }