code: function removeVirtualHostedBucketFromPath(req) {
      var httpRequest = req.httpRequest;
      var bucket = httpRequest.virtualHostedBucket;
      if (bucket && httpRequest.path) {
        if (req.params && req.params.Key) {
          var encodedS3Key = '/' + AWS.util.uriEscapePath(req.params.Key);
          if (httpRequest.path.indexOf(encodedS3Key) === 0 && (httpRequest.path.length === encodedS3Key.length || httpRequest.path[encodedS3Key.length] === '?')) {
            //path only contains key or path contains only key and querystring
            return;
          }
        }
        httpRequest.path = httpRequest.path.replace(new RegExp('/' + bucket), '');
        if (httpRequest.path[0] !== '/') {
          httpRequest.path = '/' + httpRequest.path;
        }
      }
    }
docs: Takes the bucket name out of the path if bucket is virtual-hosted
  
  @api private