S3 POST request to S3 with response 405

Question

I have the following CORS configuration for S3 in order to use one of my buckets as a static website hosting:

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
    </CORSRule>
</CORSConfiguration>

Then I have the following Edit Redirection Rules:

<RoutingRules>
    <RoutingRule>
    <Condition>
        <KeyPrefixEquals>abc</KeyPrefixEquals>
    </Condition>
    <Redirect>
        <HostName>myec2instance.com</HostName>
    </Redirect>
</RoutingRule>

What I want to do is when S3 receives a POST to /abc redirects the request and request body to my ec2 instance. The redirection rule is working properly (I was able to test this by switching POST to a GET request) but for any reason S3 is returning HTTPResponse 405 when the request is a POST. Any ideas why?

Answer 1

This isn't CORS related -- it's S3 itself. The S3 website endpoints are only equipped for GET and HEAD. Anything else should be denied before the redirection rules are checked.

Website Endpoint

Supports only GET and HEAD requests on objects.

— http://docs.aws.amazon.com/AmazonS3/latest/dev/WebsiteEndpoints.html