Endpoint override type is not strict enough #626
Description
Hi!
I got a strange exception trying to connect s3 client to local minio.
software.amazon.awssdk.core.exception.SdkClientException: Unable to marshall request to JSON: baseUri must not be null.
at software.amazon.awssdk.core.exception.SdkClientException$BuilderImpl.build(SdkClientException.java:98) ~[software.amazon.awssdk.sdk-core-2.17.61.jar:?]
at software.amazon.awssdk.services.s3.transform.HeadObjectRequestMarshaller.marshall(HeadObjectRequestMarshaller.java:53) ~[software.amazon.awssdk.s3-2.17.61.jar:?]
...
at io.github.vigoo.zioaws.s3.package$S3Impl.$anonfun$headObject$1(package.scala:2392) ~[io.github.vigoo.zio-aws-s3_2.13-3.17.61.1.jar:3.17.61.1]
Caused by: java.lang.NullPointerException: baseUri must not be null.
at software.amazon.awssdk.utils.Validate.paramNotNull(Validate.java:156) ~[software.amazon.awssdk.utils-2.17.61.jar:?]
...
After some experiments, I found that the type of endpointOverride defined here: https://github.com/vigoo/zio-aws/blob/master/zio-aws-core/src/main/scala/io/github/vigoo/zioaws/core/config/package.scala#L237-L239 allows for incorrect URIs to be passed to underlying aws sdk.
In my case it was minio:9000 instead of correct http://minio:9000
In my semi-educated guess, it would be better to change endpointOverride descriptor to url to enforce type safety.