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405 Method Not Allowed

The path exists but not with that verb. Send Allow: with the ones that work.

405Client error
What it means
The path exists but not with that verb. Send Allow: with the ones that work.
In practice
The route is real; the verb is wrong — a POST to a read-only endpoint, a GET to a webhook receiver. The response is supposed to carry an Allow header listing what the path accepts. A classic cause in the wild: an HTML form posting to a URL that only renders pages, or a trailing-slash redirect quietly converting your POST into a GET on the way through.
Whose problem is it?
The request. Retrying it unchanged will get the same answer.