```

### `HTMLResponse`

Takes some text or bytes and returns an HTML response, as you read above.

### `PlainTextResponse`

Takes some text or bytes and returns an plain text response.

```Python hl_lines="2  7  9"
{!../../../docs_src/custom_response/tutorial005.py!}
```

### `JSONResponse`

Takes some data and returns an `application/json` encoded response.

# Dependencies - `Depends()` and `Security()`

## `Depends()`

Dependencies are handled mainly with the special function `Depends()` that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from `fastapi`:

```python
from fastapi import Depends
```

::: fastapi.Depends

## `Security()`

						"B": "2",
					},
				},
				{
					"global takes precedence over default config",
					"",
					"",
					[]proxyConfigInstance{
						newProxyConfig("global", "istio-system", nil, map[string]string{
							"A": "3",
						}),
					},
					map[string]string{
						"A": "3",
						"B": "2",
					},
				},
				{
					"pod annotation takes precedence over namespace",

     * Returns the list of acceptable source file extensions. Only takes effect when compiling against
     * Groovy 1.7 or higher. Defaults to {@code ImmutableList.of("java", "groovy")}.
     */
    @Input
    public List<String> getFileExtensions() {
        return fileExtensions;
    }

    /**
     * Sets the list of acceptable source file extensions. Only takes effect when compiling against

You can import it directly from `fastapi`:

```python
from fastapi import Request
```

!!! tip
    When you want to define dependencies that should be compatible with both HTTP and WebSockets, you can define a parameter that takes an `HTTPConnection` instead of a `Request` or a `WebSocket`.

And that function takes parameters in the same way that *path operation functions* do.

!!! tip
    You'll see what other "things", apart from functions, can be used as dependencies in the next chapter.

Whenever a new request arrives, **FastAPI** will take care of:

* Calling your dependency ("dependable") function with the correct parameters.

      if (iterations >= maxIterations) {
        @SuppressWarnings("nullness") // safe because we pass sort() a range that contains real Ts
        T[] castBuffer = (T[]) buffer;
        // We've already taken O(k log k), let's make sure we don't take longer than O(k log k).
        Arrays.sort(castBuffer, left, right + 1, comparator);
        break;
      }
    }
    bufferSize = k;

// license that can be found in the LICENSE file.

//go:build unix || js || wasip1 || windows

package net

import (
	"os"
	"syscall"
)

// wrapSyscallError takes an error and a syscall name. If the error is
// a syscall.Errno, it wraps it in an os.SyscallError using the syscall name.
func wrapSyscallError(name string, err error) error {
	if _, ok := err.(syscall.Errno); ok {

// mesh config, but takes precedence.
func (w *internalWatcher) HandleMeshConfigData(yaml string) {
	w.mutex.Lock()
	defer w.mutex.Unlock()
	w.revMeshConfig = yaml
	merged := w.merged()
	w.handleMeshConfigInternal(merged)
}

// HandleUserMeshConfig keeps track of user mesh config overrides. These are merged with the standard
// mesh config, which takes precedence.

			Buckets:        metrics.ExponentialBuckets(1, 2, 5),
			StabilityLevel: metrics.ALPHA,
		},
	)
	// PodWorkerDuration is a Histogram that tracks the duration (in seconds) in takes to sync a single pod.
	// Broken down by the operation type.
	PodWorkerDuration = metrics.NewHistogramVec(
		&metrics.HistogramOpts{
			Subsystem:      KubeletSubsystem,
			Name:           PodWorkerDurationKey,