I have uploaded in an AWS S3 Bucket a web application which I created by using Angular 18; the app calls via http (post method) an external mailer service (Sengrid), in order to send messages from a form.

Locally everything works; after uploading the app in the bucket, I tried to send a message from the same form but the message was not sent. By opening the dev console -> network, I read the following error:

405 Method Not Allowed Code: MethodNotAllowed Message: The specified
method is not allowed against this resource. Method: POST
ResourceType: OBJECT RequestId: XXX HostId: XXX

I tried many solutions – including changing the security settings of the bucket, as suggested in other discussion – but nothing works. How can I solve the problem?

Thank you very much