S3 Not responding to OPTIONS request when using presigned URL from the browser

I'm attempting to use a pre-signed URL from within the browser to upload to my localstack S3 service. Generating the URL itself is trivial, however when attempting to POST to the resulting url (e.g http://localstack:4572/ps.local/test?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD...), the browser makes an OPTIONS preflight request, to which localstack does not respond.

It appears as if there is no way around this even with flexible CORS rules (see below). It's not therefore possible to directly upload files from the browser to localstack S3 using presigned URL's.

            $s3->putBucketCors([
                'Bucket' => 'myBucket',
                'CORSConfiguration' => [
                    'CORSRules' => [
                        [
                            'AllowedOrigins' => ['*'],
                            'AllowedMethods' => ['POST', 'GET', 'PUT'],
                            'MaxAgeSeconds' => 3000,
                            'AllowedHeaders' => ['*']
                        ]
                    ]
                ]
            ]);

~~If someone can advise on whether or not I've overlooked something I'll be happy to investigate further and follow up with a PR.~~

Moved from original github issue: https://github.com/atlassian/localstack/issues/99

Confirmed as bug, will investigate further.

Comments (7)