fix: send request XML object instead of Object.toString() to execute()

[balamurugana]

Fixes #881

[kannappanr]

This doesn't work with AWS S3

[kannappanr]

import io.minio.MinioClient;
import io.minio.errors.MinioException;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import org.xmlpull.v1.XmlPullParserException;

public class MakeBucket {
  /** MinioClient.makeBucket() example. */
  public static void main(String[] args)
      throws IOException, NoSuchAlgorithmException, InvalidKeyException, XmlPullParserException {
    try {
      /* Amazon S3: */
      MinioClient minioClient = new MinioClient("https://s3.amazonaws.com", "YOUR-ACCESSKEYID", "YOUR-SECRETACCESSKEY");

      // Create bucket if it doesn't exist.
      boolean found = minioClient.bucketExists("non-existent-bucket");
      minioClient.traceOn(System.out);
      if (found) {
        System.out.println("non-existent-bucket already exists");
      } else {
        // Create bucket 'non-existent-bucket'.
        minioClient.makeBucket("non-existent-bucket", "us-west-1", false);
        System.out.println("non-existent-bucket is created successfully");
      }
    } catch (MinioException e) {
      System.out.println("Error occurred: " + e);
    }
  }
}

[kannappanr]

This still doesn't work when you set MINIO_REGION=us-west-1 and start minio server and use the code provided above

[balamurugana]

This still doesn't work when you set MINIO_REGION=us-west-1 and start minio server and use the code provided above

Can you enable MinioClient.traceOn() and share the trace?

[balamurugana]

This still doesn't work when you set MINIO_REGION=us-west-1 and start minio server and use the code provided above

Minio server master doesn't work with region. minio-go throws 2020/03/28 13:23:11 The authorization header is malformed; the region is wrong; expecting 'us-east-1'.

[harshavardhana]

If the server region is set then it's like AWS region specific endpoints, so you can't use us-east-1 for that minio-go constructor needs to be initialized with the right region.

[balamurugana]

If the server region is set then it's like AWS region specific endpoints, so you can't use us-east-1 for that minio-go constructor needs to be initialized with the right region.

Found actual behaviour and fixed

[kannappanr]

LGTM