I'm sorry for my lazy... i add temporary access signature code, but i dont known how to test it. It could work in aws region cn-north-1.
```java
public class AWSS3BlobStoreContextModule extends S3BlobStoreContextModule {
//...
@Override
protected void bindRequestSigner() {
bind(BlobRequestSigner.class).to(AWSS3BlobRequestSignerV4.class);
}
}
```
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