aws4-axios

Axios request interceptor for signing HTTP requests with AWS Signature Version 4 (AWSv4). Version 3.4.0 requires Node >=16 and axios >=1.6.0. Supports explicit credentials, custom credential providers, and content SHA headers for services like OpenSearch Serverless. v3 includes a breaking API change: options are now nested under an `options` property. Ships TypeScript definitions. Suitable for accessing AWS services protected by IAM auth (e.g., API Gateway).