Using the OAuth 2.0 configuration of HTTP Client Connectors with Dell Boomi (useful for Azure PaaS Web Applications that use Azure AD)

My company recently started using Dell's Boomi platform to connect to some of our PaaS applications running in Azure that use Azure Active Directory for authentication. We had tried previously to get the OAuth 2.0 security settings on the HTTP Client Connector working to no avail. Due to some of the work we have coming up for which we really wanted to be able to use the OAuth 2.0 configured connectors, I decided to try again, and got it working. Here's what I had to do in order to use an HTTP Client Connector with Azure AD:

• PRECONDITIONS:
• Must have two Web Applications defined in Azure AD: client application AppC, and service application AppS
• AppC must be setup for the following:
• Have an App Key defined
• In the manifest, must set to true the following settings: oauth2AllowImplicitFlow, oauth2AllowUrlPathMatching
• On the "Settings" tab of your HTTP Client, do the following:
• "URL" => The URL of the API to which you want to connect (underneath AppS).
• "Authentication Type" => OAuth 2.0
• "Client ID" => The Client ID of an Azure AD **Web Application** registered in Azure AD, that has **ALREADY BEEN PRECONFIGURED FOR ACCESS TO YOUR SERVICE**. This can be copied and pasted from the Azure web portal AD application page for your application. This is the Client ID in the configuration page for AppC.
• "Client Secret" => The App Key (in Azure terminology) of the Azure AD **Web Application** registered in Azure AD to be used as a client application for your service.
• "Authorization Token URL" => The "OAUTH 2.0 AUTHORIZATION ENDPOINT" copied out of the Azure AD "Applications" tab in the Azure Management Portal. This is the App Key (at least one of them anyway) for AppC in the Azure AD Management Portal.
• "Access Token URL" => The "OAUTH 2.0 TOKEN ENDPOINT" copied out of the Azure AD "Applications" tab in the Azure Management Portal.
• Under the "Add Authorization Parameter" link, you'll need to add 2 parameters. Click on the "Add Authorization Parameter" link twice to add them. You'll need the following for parameters:
• "grant_type" => "client_credentials"
• "resource" => The App ID URI of the target Web Application registered in Azure AD acting as the service to which your client Web Application is connecting. This is the App ID Uri of AppS.
• In the Azure AD portal for your Client Web Application, you'll need to add the OAuth callback URL for your Boomi account to the "Reply URLs" list for AppC. e.g. https://platform.boomi.com/account/[companyaccountname-11X11X]/oauth2/callback
• At the bottom of the page, click on the "Generate" button next to the "Access Token" label. Boomi will now attempt to connect to Azure AD. To do this, it will open up a new web page and attempt to authorize, so ensure that you have any pop-up blockers either turned off or configured to allow platform.boomi.com to open pop-ups.