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Development with the Force.com Platform: Building Business Applications in the Cloud, Third Edition by Jason Ouellette

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Apex Callouts

A callout is a request made to a system outside of Force.com from within the platform. There are many Web APIs, free and premium, that can be quickly integrated into your Apex code using Apex callouts. This section describes how to work with the two different styles of callouts in Force.com:

1. Calling RESTful services from Apex—Force.com includes classes for issuing HTTP and HTTPS requests, encoding and decoding URLs and Base64 content, and performing cryptographic signing and hashing often needed to comply with the security requirements of external services.

2. Calling SOAP services from Apex—Apex code can be generated directly from WSDL, producing methods for invoking an external Web service and representing the input and output ...

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