Auto-retry for API calls

Many functions automatically retry failed API calls before giving up:

• The HTTP functions
• The REST functions
• The Xurrent REST API functions
• The Xurrent Graphql API functions

This is useful for transient network errors, rate limiting, and so on.

Auto-retry works for Xurrent and Microsoft Graph accounts, and for all HTTP accounts that are configured with one of the following authentication types:

• Bearer token
• OAuth 2.0 client credentials
• OAuth 2.0 password
• Custom header
• Custom URL parameter

Retrying is done according to the following rules:

• Rate limit
  When the retry-after header is present in the response, retry after the specified delay.
• GraphQL cost limit
  When the response indicates that the query cost exceeds the remaining budget, retry after the delay specified in the response body.
• Connection error
  Retry based on error type:
  • ETIMEDOUT (1 retry)
  • ECONNREFUSED / ECONNRESET / ENOTFOUND (5 retries)
  • Other (10 retries)
• 4xx or 5xx response code
  Most status codes are retried up to 2 times. The following status codes are not retried:
  • 400
  • 401
  • 404
  • 422
  • 505