Metadata API Developer Guide
Summer '26 (API version 67.0)
Spring '26 (API version 66.0)
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Summer '22 (API version 55.0)
Spring '22 (API version 54.0)
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Summer '21 (API version 52.0)
Spring '21 (API version 51.0)
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Summer '20 (API version 49.0)
Spring '20 (API version 48.0)
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Summer '19 (API version 46.0)
Spring '19 (API version 45.0)
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Spring '18 (API version 42.0)
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Summer '17 (API version 40.0)
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Summer '15 (API version 34.0)
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Spring '14 (API version 30.0)
Newer Version Available
Headers
Use headers in Metadata API calls to set options for each call.
-
AllOrNoneHeader
Indicates whether to roll back all metadata changes when some of the records in a call result in failures. -
CallOptions
Specifies the API client identifier. -
DebuggingHeader
Specifies that the deployment result contains the debug log output, and specifies the level of detail included in the log. The debug log contains the output of Apex tests that are executed as part of a deployment. -
SessionHeader
Specifies the session ID that the login call returns. This session ID is used to authenticate all subsequent Metadata API calls.