Ask When can a correct 301 domain redirect still break third-party integration?

[Dean101]

Some APIs, webhooks, or OAuth flows expect an exact callback URL and won't follow redirects safely, causing authentication failures. Cached endpoints on external services may also keep pointing to the old domain, leading to silent errors. Tracking scripts or SDKs might lose parameters during the redirect, breaking data flow. Even SSL or CORS policies can block redirected requests if not updated. Watching logs, failed requests, and retries helps identify where integrations stop working and what needs updating beyond the redirect itself.