Should an HTTP callout generally be handled synchronously or asynchronously?

Choosing to handle an HTTP callout asynchronously is often preferred because it allows for non-blocking operations, which can significantly enhance user experience and system performance. When an HTTP callout is executed synchronously, the application must wait for the external response before continuing further processes. This can lead to delays if the external service is slow or unresponsive, creating a frustrating experience for users and potentially leading to timeouts or bottlenecks in the application.

By handling HTTP callouts asynchronously, the application can initiate the call and then continue processing other tasks while waiting for the response. This optimizes resource usage and enhances the overall efficiency of the application. Additionally, asynchronous callouts can help with better error handling and response management, as responses can be processed separately from the main execution flow.

In summary, opting for asynchronous handling of HTTP callouts improves responsiveness and performance, making it the appropriate choice for most applications working with external services.