You will see examples of this in the next chapters, about relational and NoSQL databases, security, etc.

## **FastAPI** compatibility

The simplicity of the dependency injection system makes **FastAPI** compatible with:

* all the relational databases
* NoSQL databases
* external packages
* external APIs
* authentication and authorization systems
* API usage monitoring systems

","_weekdaysMin","_weekdaysShort","weekdayName","_weekdaysParseExact","_weekdaysParse","_shortWeekdaysParse","_minWeekdaysParse","_fullWeekdaysParse","charAt","isLower","langData","mathAbs","addSubtract$1","absCeil","daysToMonths","monthsToDays","makeAs","alias","as","asMilliseconds","asSeconds","asMinutes","asHours","asDays","asWeeks","asMonths","asQuarters","asYears","makeGetter","thresholds","relativeTime$1","posNegDuration","abs$1","toISOString$1","totalSign","ymSign","daysSign","hmsSign","t...

	}
	return loi, nil
}

func maxKeysPlusOne(maxKeys int, addOne bool) int {
	if maxKeys < 0 || maxKeys > maxObjectList {
		maxKeys = maxObjectList
	}
	if addOne {
		maxKeys++
	}
	return maxKeys
}

func (z *erasureServerPools) listObjectsGeneric(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int, v1 bool) (loi ListObjectsInfo, err error) {
	opts := listPathOptions{

		var fw fileWriter
		switch maker := v.maker.(type) {
		case makeReg:
			fw = &regFileWriter{w, maker.size}
			wantStr = maker.wantStr
		case makeSparse:
			if !validateSparseEntries(maker.sph, maker.size) {
				t.Fatalf("invalid sparse map: %v", maker.sph)
			}
			spd := invertSparseEntries(maker.sph, maker.size)
			fw = &regFileWriter{w, maker.makeReg.size}
			fw = &sparseFileWriter{fw, spd, 0}

> Modern versions of Python have support for **"asynchronous code"** using something called **"coroutines"**, with **`async` and `await`** syntax.

That should make more sense now. ✨

All that is what powers FastAPI (through Starlette) and what makes it have such an impressive performance.

## Very Technical Details

/// warning

You can probably skip this.

	data.Delimiter = s3EncodeName(delimiter, encodingType)
	data.MaxKeys = maxKeys

	data.NextKeyMarker = s3EncodeName(resp.NextMarker, encodingType)
	data.NextVersionIDMarker = resp.NextVersionIDMarker
	data.VersionIDMarker = versionIDMarker
	data.IsTruncated = resp.IsTruncated

	prefixes := make([]CommonPrefix, 0, len(resp.Prefixes))
	for _, prefix := range resp.Prefixes {

## OpenAPI

OpenAPI (previously known as Swagger) is the open specification for building APIs (now part of the Linux Foundation).

**FastAPI** is based on **OpenAPI**.

That's what makes it possible to have multiple automatic interactive documentation interfaces, code generation, etc.

OpenAPI has a way to define multiple security "schemes".

            }
        }
    ]
}
```
Note: This rule has an implicit zero NoncurrentDays, which makes the expiry of those 'extra' noncurrent versions immediate.

#### 3.2.b Automatic removal of all versions (MinIO only extension)

This is available only on MinIO as an extension to the Expiration feature. The following rule makes it possible to remove all versions of an object under 

}

// return URL for listing objects in the bucket with V1 legacy API.
func getListObjectsV1URL(endPoint, bucketName, prefix, maxKeys, encodingType string) string {
	queryValue := url.Values{}
	if maxKeys != "" {
		queryValue.Set("max-keys", maxKeys)
	}
	if encodingType != "" {
		queryValue.Set("encoding-type", encodingType)
	}
	return makeTestTargetURL(endPoint, bucketName, prefix, queryValue)

If there's a security flaw in your code, it will still exist.