title: Azure Data Factory - "Invalid format" error
body: <p>I have a 1-step pipeline in ADF which is a single &quot;Web activity&quot; which sends a <code>GET</code> request to a simple REST API. The complete definition is as follows:</p>
  <p><code>URL</code> : <code>https://allstate.myabsorb.com/api/rest/v1/ecommerce/transactions?transactiondate=2021-01-11</code></p>
  <p><code>Method</code> : <code>GET</code></p>
  <p><strong>Headers</strong></p>
  <p><code>Authorization</code> : <code>xyz/123+abc123==</code></p>
  <p><code>Content-Type</code> : <code>application/json</code></p>
  <p>When I execute this request via Postman, the request is successful. However, when I send the same request via Web Activity in Azure Data Factory, I receive the following error message:</p>
  <pre><code>Error calling the endpoint 'https://allstate.myabsorb.com/api/rest/v1/ecommerce/transactions?transactiondate=2021-01-11'. Response status code: ''. More details:Exception message: 'The format of value 'xyz/123+abc123==' is invalid.'. No response from the endpoint. Possible causes: network connectivity, DNS failure, server certificate validation or timeout.
  </code></pre>
  <p>Through testing I've discovered that if I remove both the equal sign ( = ) and the forward slash ( / ) from the Authorization string, I do receive a valid response from the API:</p>
  <pre><code>{&quot;Message&quot;:&quot;Authorization has been denied for this request.&quot;}
  </code></pre>
  <p>This is great. <strong>This is the expected response I'm looking for</strong> (note that ADF still considers this an error, but this is the desired output) The problem is that in practice <strong>I cannot remove these characters from the string</strong> because then the token is invalid which means I cannot gain access to the API... I need a way to modify the Authorization string to the correct &quot;type&quot; without changing the value.</p>
  <p>Is there a way to allow special characters in my Authorization string for this REST API call?</p>
  <hr />
  <p>This is what the result <em><strong>should</strong></em> look like:
  <a href="https://i.stack.imgur.com/Nt9GW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Nt9GW.png" alt="enter image description here" /></a></p>
  <hr />
  <p>This is what the successful result looks like in Postman</p>
  <p><a href="https://i.stack.imgur.com/6YJQK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6YJQK.png" alt="enter image description here" /></a></p>