REST API Developer Guide

Introduction to REST API
About REST API
Release Notes
Supported Editions and Required Permissions
REST Resources and Requests
REST API Architecture
Authorization Through External Client Apps or Connected Apps and OAuth 2.0
Headers
Assignment Rule Header
Call Options Header
Compression Headers
Conditional Request Headers
Duplicate Rule Header
Limit Info Header
MRU Header
Package Version Header
Query Options Header
Warning Header
Send REST Requests with cURL
Valid Date and DateTime Formats
Status Codes and Error Responses
API End-of-Life Policy
Quick Start
Examples
Generating an OpenAPI 3.0 Document for sObjects REST API (Beta)
Reference
PDF

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Warning Header

This header is returned if there are warnings, such as the use of a deprecated version of the API.

Header Field Name and Values

Field name
Warning
Field Values
warningCode warningMessage
For warnings about deprecated API versions, the warningCode is 299.

Example

1Warning: 299 - "This API is deprecated and will be removed by Summer '22. Please see https://help.salesforce.com/articleView?id=000351312 for details."