title: Retrieve key vault in web activity in Azure Data Factory
body: <p>I am new to Azure Data Factory and I am now stuck at last step to finish my current task.</p>
  <p>There are few REST API's that I need to call from ADF using Web Activity but before I make to REST API POST call, in this POST call I need to pass user credentials to be fetched from key vault and passing into BODY section. Once this POST request is issued I need to get authentication token from that server, hence as it is working in hard coded fashion.
  But now I want to fetch userId and password from Azure Key Vault and I then need to pass it to Web Activity.</p>
  <p>NOTE : I do not want to use MSI option.</p>
  <p>Could you please help on retrieving userId and password from Azure Key Vault for Web Activity to pass this as part of authentication?</p>