title: How to authorise request Azure REST API?
body: <p>I am creating a program to drop CDN cache. And so I did as documentation said I still get this:</p>
  
  <p>{
    "error": {
      "code": "AuthenticationFailedInvalidHeader",
      "message": "Authentication failed. The 'Authorization' header is provided in an invalid format."
    }
  }</p>
  
  <p>So it basically says that the Authentication token itself is malformatted (not wrong or expired). Even though I did as documentation suggested.</p>
  
  <p>My Request-Response flow looks like this (I obfuscated real data):</p>
  
  <pre><code>REQUEST
  
   POST /subscriptions/29bdq1a7-348b-48fe-b9e6-b90c432892ff/resourceGroups/cdn-4/providers/Microsoft.Cdn/Profiles/CDN-3-Premium/endpoints/custom-endpoint.azureedge.net/purge?api-version=2015-06-01 HTTP/1.1
  Content-Length: 90
  User-Agent: GuzzleHttp/6.1.1 curl/7.35.0 PHP/7.0.2-2+deb.sury.org~trusty+1
  Host: management.azure.com
  Authorization: SharedAccessSignature uid=56c6d48a66904d02ce030003&amp;ex=2017-02-19T11:41:00.0000000Z&amp;sn=9wBsmFuP1ps01rt8nVlvsiAIdJMOqNsmGaiXUlfT35RxOvWAjHHcSIQdJA8v9wGvX4bJgX5fu1QyqVG6y9iQ6Q==
  Content-Type: application/json
  
  {
      "ContentPaths": [
          "/uploads/static/ads_en.json",
          "/pic2.jpg"
      ]
  }
  
    RESPONSE
  
    HTTP/1.1 401 Unauthorized
  Cache-Control: no-cache
  Pragma: no-cache
  Content-Type: application/json; charset=utf-8
  Expires: -1
  WWW-Authenticate: Bearer authorization_uri="https://login.windows.net/c87x6f33-af21-4461-a5b1-29647d8e9281", error="invalid_token", error_description="The authentication scheme of SharedAccessSignature is not supported."
  x-ms-failure-cause: gateway
  x-ms-request-id: 3514027b-e731-411c-b8es-cdf77d636284
  x-ms-correlation-request-id: 3514137b-e731-411c-b8ee-cdf77d636284
  x-ms-routing-request-id: WESTEUROPE:20160219T110919Z:3514037b-e731-411c-b7ee-cdf77d636184
  Strict-Transport-Security: max-age=31536000; includeSubDomains
  Date: Fri, 19 Feb 2016 11:09:19 GMT
  Connection: close
  Content-Length: 150
  
  {"error":{"code":"AuthenticationFailedInvalidHeader","message":"Authentication failed. The 'Authorization' header is provided in an invalid format."}}\
  </code></pre>
  
  <p>Can you suggest the way to solve it?</p>