OPTIONS Method — the most boring HTTP method that keeps breaking your API

OPTIONS is the HTTP method nobody cares about. Which is exactly why it keeps biting teams in production.

When an API answers a perfectly valid OPTIONS request with 400 Bad Request, it’s not being “strict”.
It’s just… not speaking HTTP properly.

Browsers use OPTIONS.

Gateways use OPTIONS.

SDKs rely on OPTIONS.

And when it fails, nobody debugs OPTIONS first — they blame CORS, proxies, firewalls, or “that frontend guy”.

Rentgen flags this as Fail, not a warning, because broken method semantics don’t just look ugly — they break real integrations in the most boring, time-wasting ways possible.

If your API claims to be REST-ish, OPTIONS is not optional.

👉 Full story (with examples, why it breaks, and how to fix it properly):
🔗 https://rentgen.io/api-stories/options-method-handling.html