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Force.com Canvas SDK
Force.com Canvas is a set of tools that enable you to integrate your apps within Salesforce. This framework includes an SDK that you can use to authenticate your app and retrieve data from Salesforce. The Force.com Canvas SDK and code examples are available on GitHub at https://github.com/forcedotcom/salesforcecanvasframeworksdk.
The Force.com Canvas SDK is versioned and matches the API version in each release. The current version is 34.0. You can find out the version of the SDK that you have by calling the version method. Previous versions of this developer’s guide can be found at https://developer.salesforce.com/page/Earlier_Reference_Documentation.