Guides
Practical playbooks for retiring API versions, telling consumers what's changing, and rotating credentials. Each one works whether or not you use EndPointBlank.
A step-by-step playbook for retiring an old API version: find who still calls it, announce it in the response, send reminders, and retire on evidence.
Build a list of every client still calling your old API version, with call counts and last-seen times, before you retire it.
The Deprecation (RFC 9745) and Sunset (RFC 8594) HTTP headers: exact syntax, common mistakes, and code for Rails, Express, Phoenix, FastAPI and Spring.
A copy-and-edit API deprecation policy: notice periods, how consumers are told, support for deprecated versions, extensions, and what happens after retirement.
Five copy-and-edit emails for retiring an API version: the announcement, reminders 30, 7 and 1 day out, and the day after.
Rotate API client secrets with an overlap window, so callers switch on their own schedule: the steps, server-side code, and the pitfalls.
Why a retired API endpoint should return 410 Gone, not 404, what the response body should say, and code for Express and Phoenix.
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