You can call HTTP functions yourself from a browser (if GET is enabled), from your code (using an HTTP client), or using another program that supports HTTP requests. Another really cool feature that's at the core of functions is that they can be triggered by various events, thereby enabling an event-driven programming architecture. For example, a function can be triggered when a message is put on a Service Bus queue, when a blob is changed or added to a storage account, or when a document changes in Cosmos DB. There are various other triggers that I personally haven't needed yet, but there are triggers for Event Grid, Azure Active Directory, Outlook, and more. You'll see them for yourself when you create a new function.
Germany
Slovakia
Canada
Brazil
Singapore
Hungary
Philippines
Mexico
Thailand
Ukraine
Luxembourg
Estonia
Lithuania
Norway
Chile
United States
Great Britain
India
Spain
South Korea
Ecuador
Colombia
Taiwan
Switzerland
Indonesia
Cyprus
Denmark
Finland
Poland
Malta
Czechia
New Zealand
Austria
Turkey
France
Sweden
Italy
Egypt
Belgium
Portugal
Slovenia
Ireland
Romania
Greece
Argentina
Malaysia
South Africa
Netherlands
Bulgaria
Latvia
Australia
Japan
Russia