* resources
* providers
* services
* injectables
* components

## **FastAPI** plug-ins { #fastapi-plug-ins }

Integrations and "plug-ins" can be built using the **Dependency Injection** system. But in fact, there is actually **no need to create "plug-ins"**, as by using dependencies it's possible to declare an infinite number of integrations and interactions that become available to your *path operation functions*.

Using an option directly from Starlette you can declare a *path parameter* containing a *path* using a URL like:

```
/files/{file_path:path}
```

In this case, the name of the parameter is `file_path`, and the last part, `:path`, tells it that the parameter should match any *path*.

So, you can use it with:

{* ../../docs_src/path_params/tutorial004_py39.py hl[6] *}

/// tip

				},
			},
		},

		// listMultipartResults - 31.
		// checking listing with marker set to 3.
		// `NextUploadIDMarker` is expected to be set on last uploadID in the result.
		// `NextKeyMarker` is expected to be set on the last object key in the list.
		{
			MaxUploads:         3,
			IsTruncated:        true,
			NextUploadIDMarker: uploadIDs[6],
			NextKeyMarker:      objectNames[2],

- `filename` — если задан, будет включён в заголовок ответа `Content-Disposition`.

Файловые ответы будут содержать соответствующие заголовки `Content-Length`, `Last-Modified` и `ETag`.

{* ../../docs_src/custom_response/tutorial009_py39.py hl[2,10] *}

Вы также можете использовать параметр `response_class`:

{* ../../docs_src/custom_response/tutorial009b_py39.py hl[2,8,10] *}

Many of the tutorials have blocks of code.

In most of the cases, these blocks of code are actual complete applications that can be run as is.

In fact, those blocks of code are not written inside the Markdown, they are Python files in the `./docs_src/` directory.

And those Python files are included/injected in the documentation when generating the site.

### Docs for tests

For now, you just need to know that `Annotated` exists, and that it's standard Python. 😎

Later you will see how **powerful** it can be.

/// tip

The fact that this is **standard Python** means that you will still get the **best possible developer experience** in your editor, with the tools you use to analyze and refactor your code, etc. ✨

		partsCount := totalSize/partSize + 1
		// Return the part's size
		switch {
		case int64(partIndex) < partsCount:
			currPartSize = partSize
		case int64(partIndex) == partsCount:
			// Size of last part
			currPartSize = totalSize % partSize
		default:
			currPartSize = 0
		}
	}
	return currPartSize, nil

}

func readBackgroundHealInfo(ctx context.Context, objAPI ObjectLayer) backgroundHealInfo {
	if globalIsErasureSD {
		return backgroundHealInfo{}
	}

	// Get last healing information
	buf, err := readConfig(ctx, objAPI, backgroundHealInfoPath)
	if err != nil {
		if !errors.Is(err, errConfigNotFound) {
			internalLogOnceIf(ctx, err, backgroundHealInfoPath)
		}

// The input must have been already validated.
//
// This function mutates src and returns a normalized map where:
//   - adjacent fragments are coalesced together
//   - only the last fragment may be empty
//   - the endOffset of the last fragment is the total size
func invertSparseEntries(src []sparseEntry, size int64) []sparseEntry {
	dst := src[:0]
	var pre sparseEntry
	for _, cur := range src {
		if cur.Length == 0 {

	if err = target.init(); err != nil {
		return err
	}
	switch {
	case key.ItemCount == 1:
		var event event.Event
		event, err = target.store.Get(key)
		if err != nil {
			// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
			// Such events will not exist and wouldve been already been sent successfully.
			if os.IsNotExist(err) {
				return nil
			}