Event-Driven and reactive architectures (see the "Reactive Manifesto" if you're new to the topic or interested to learn more about it) are very popular today. Events - and thus data - is pushed to services so that integration can happen faster and more efficiently.
With Azure SQL database it is possible to call a REST API using the stored procedure
sp_invoke_external_rest_endpoint. It is available in any Azure SQL Database (so, no Azure SQL Managed Instance or SQL Server for now) and it as easy to use as you would expect:
declare @response nvarchar(max);
@url = N'https://say-hello.azurewebsites.net/api/hello-message',
@response = @response output;
select * from openjson(@response);
Take a look at the documentation here: sp_invoke_external_rest_endpoint (Transact-SQL) and unleash your creativity. The possibilities that this feature opens are almost infinite.
The feature is in Public Preview, which means that this is the perfect time to give us your feedback, if you think something can be improved or needs to be changed. Feel free to comment here below, if you have any questions or ideas you want to share.
In the meantime, happy coding! :)