if objInfo.ETag != "" && !del {
		w.Header()[xhttp.ETag] = []string{`"` + objInfo.ETag + `"`}
	}

	// Set the relevant version ID as part of the response header.
	if objInfo.VersionID != "" && objInfo.VersionID != nullVersionID {
		w.Header()[xhttp.AmzVersionID] = []string{objInfo.VersionID}
		// If version is a deleted marker, set this header as well
		if objInfo.DeleteMarker && del { // only returned during delete object

}

// ObjectV object version key/versionId
type ObjectV struct {
	ObjectName string `xml:"Key"`
	VersionID  string `xml:"VersionId"`
}

// ObjectToDelete carries key name for the object to delete.
type ObjectToDelete struct {
	ObjectV
	// Replication status of DeleteMarker
	DeleteMarkerReplicationStatus string `xml:"DeleteMarkerReplicationStatus"`
	// Status of versioned delete (of object or DeleteMarker)

)

// From Veeam-SOSAPI_1.0_Document_v1.02d.pdf
// - SOSAPI Protocol Version
// - Model Name of the vendor plus version for statistical analysis.
// - List of Smart Object Storage protocol capabilities supported by the server.
// Currently, there are three capabilities supported:
//   - Capacity Reporting
//   - Backup data locality for upload sessions (Veeam Smart Entity)

//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of

 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *

 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *

// passes versionID additionally.
func checkRequestAuthTypeWithVID(ctx context.Context, r *http.Request, action policy.Action, bucketName, objectName, versionID string) (s3Err APIErrorCode) {
	logger.GetReqInfo(ctx).BucketName = bucketName
	logger.GetReqInfo(ctx).ObjectName = objectName
	logger.GetReqInfo(ctx).VersionID = versionID

	_, _, s3Err = checkRequestAuthTypeCredential(ctx, r, action)

	Object     string `json:"object" msg:"o"`
	versionID  string `json:"-"`
	RetryCount int    `json:"retryCount" msg:"rc"`
	sz         int64  `json:"-"`
}

// MRFReplicateEntries has the map of MRF entries to save to disk
type MRFReplicateEntries struct {
	Entries map[string]MRFReplicateEntry `json:"entries" msg:"e"`
	Version int                          `json:"version" msg:"v"`
}

}

// InvalidVersionID invalid version id
type InvalidVersionID GenericError

func (e InvalidVersionID) Error() string {
	return "Invalid version id: " + e.Bucket + "/" + e.Object + "(" + e.VersionID + ")"
}

// VersionNotFound version does not exist.
type VersionNotFound GenericError

func (e VersionNotFound) Error() string {

Y esa función `get_openapi()` recibe como parámetros:

* `title`: El título de OpenAPI, mostrado en la documentación.
* `version`: La versión de tu API, por ejemplo `2.5.0`.
* `openapi_version`: La versión de la especificación OpenAPI utilizada. Por defecto, la más reciente: `3.1.0`.
* `summary`: Un breve resumen de la API.