## Add `dependencies` to the *path operation decorator*

The *path operation decorator* receives an optional argument `dependencies`.

It should be a `list` of `Depends()`:

//// tab | Python 3.9+

```Python hl_lines="19"
{!> ../../docs_src/dependencies/tutorial006_an_py39.py!}
```

////

```Python
from fastapi import FastAPI
from unicorn import UnicornMiddleware

app = FastAPI()

app.add_middleware(UnicornMiddleware, some_config="rainbow")
```

`app.add_middleware()` receives a middleware class as the first argument and any additional arguments to be passed to the middleware.

## Integrated middlewares

**FastAPI** includes several middlewares for common use cases, we'll see next how to use them.

	versionID := srcInfo.VersionID
	if srcInfo.versionOnly {
		versionID = dstOpts.VersionID
		// preserve destination versionId if specified.
		if versionID == "" {
			versionID = mustGetUUID()
			fi.IsLatest = true // we are creating a new version so this is latest.
		}
	}

	modTime = UTCNow() // We only preserve modTime if dstOpts.MTime is true.
	// in all other cases mtime is latest.

	d := jstream.NewDecoder(r, 0).ObjectAsKVS().MaxDepth(10)
	sset := set.NewStringSet()
	for mv := range d.Stream() {
		var kvs jstream.KVS
		if mv.ValueType == jstream.Object {
			// This is a JSON object type (that preserves key order)
			kvs = mv.Value.(jstream.KVS)
			for _, kv := range kvs {
				if sset.Contains(kv.Key) {
					// Reject duplicate conditions or expiration.

		if err = json.Unmarshal(data, cfg); err != nil {
			// Unable to parse old JSON simply re-initialize a new one.
			return newServerCfg()
		}
	}

	if !globalCredViaEnv && cfg.Credential.IsValid() {
		// Preserve older credential if we do not have
		// root credentials set via environment variable.
		globalActiveCred = cfg.Credential
	}

   * k, valueFunction))}. {@code ImmutableMap.copyOf(stream.collect(Collectors.toMap(k -> k,
   * valueFunction)))} behaves similarly, but may not preserve the order of entries.
   *
   * @throws NullPointerException if any element of this iterable is {@code null}, or if {@code
   *     valueFunction} produces {@code null} for any key
   * @since 14.0
   */

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package bytes_test

import (
	. "bytes"
	"fmt"
	"testing"
)

var compareTests = []struct {
	a, b []byte
	i    int
}{
	{[]byte(""), []byte(""), 0},
	{[]byte("a"), []byte(""), 1},
	{[]byte(""), []byte("a"), -1},
	{[]byte("abc"), []byte("abc"), 0},

    while (!data.exhausted()) {
      assertFailsWith<ProtocolException> {
        clientReader.processNextFrame()
      }.also { expected ->
        assertThat(expected.message!!)
          .matches(Regex("Code \\d+ is reserved and may not be used."))
      }
      count++
    }
    assertThat(count).isEqualTo(1988)
  }

  @Test fun clientWithCompressionCannotBeUsedAfterClose() {

      return hash == that.asLong();
    }

    private static final long serialVersionUID = 0;
  }

  /**
   * Creates a {@code HashCode} from a byte array. The array is defensively copied to preserve the
   * immutability contract of {@code HashCode}. The array cannot be empty.
   *
   * @since 15.0 (since 12.0 in HashCodes)
   */
  public static HashCode fromBytes(byte[] bytes) {

}

// filterObjectsOnly will remove prefix directories.
// Order is preserved, but the underlying slice is modified.
func (m *metaCacheEntriesSorted) filterObjectsOnly() {
	dst := m.o[:0]
	for _, o := range m.o {
		if !o.isDir() {
			dst = append(dst, o)
		}
	}
	m.o = dst
}

// filterPrefixesOnly will remove objects.
// Order is preserved, but the underlying slice is modified.