Docker ve benzeri araçlar image build ederken ayrıca bir **internal cache** kullanır. Son build'den beri bir dosya değişmediyse, dosyayı tekrar kopyalayıp sıfırdan yeni bir layer oluşturmak yerine, daha önce oluşturulan **aynı layer**'ı yeniden kullanır.

      Object result = Iterables.getOnlyElement(finalResults);
      if (result == CancellationException.class) {
        assertTrue(future.isCancelled());
        if (future.wasInterrupted()) {
          // We were cancelled, it is possible that setFuture could have succeeded too.
          assertThat(numSuccessfulSetCalls.get()).isIn(Range.closed(1, 2));
        } else {
          assertThat(numSuccessfulSetCalls.get()).isEqualTo(1);

Ce sont des détails très poussés sur comment **FastAPI** fonctionne en arrière-plan.

Si vous avez de bonnes connaissances techniques (coroutines, threads, code bloquant, etc.) et êtes curieux de comment **FastAPI** gère `async def` versus le `def` classique, cette partie est faite pour vous.

///

### Fonctions de chemin d'accès { #path-operation-functions }

}

func TestPeekThenUnreadRune(t *testing.T) {
	// This sequence used to cause a crash.
	r := NewReader(strings.NewReader("x"))
	r.ReadRune()
	r.Peek(1)
	r.UnreadRune()
	r.ReadRune() // Used to panic here
}

var testOutput = []byte("0123456789abcdefghijklmnopqrstuvwxy")
var testInput = []byte("012\n345\n678\n9ab\ncde\nfgh\nijk\nlmn\nopq\nrst\nuvw\nxy")

	connectTime := time.Now()
	for {
		n, err := io.CopyN(xioutil.Discard, r.Body, 128*humanize.KiByte)
		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
			// would mean the network is not stable. Logging here will help in debugging network issues.
			if time.Since(connectTime) < (globalNetPerfMinDuration - time.Second) {
				adminLogIf(ctx, err)
			}
		}
		totalRx += n

// https://www.iana.org/domains/root/db/beats.html
beats

// beauty : XYZ.COM LLC
// https://www.iana.org/domains/root/db/beauty.html
beauty

// beer : Registry Services, LLC
// https://www.iana.org/domains/root/db/beer.html
beer

// bentley : Bentley Motors Limited
// https://www.iana.org/domains/root/db/bentley.html
bentley

// berlin : dotBERLIN GmbH & Co. KG

                log.trace("byteCount=" + this.byteCount + " but readBytesWireFormat returned " + n);
            }
            // Don't think we can rely on n being correct here. Must use byteCount.
            // Last paragraph of section 3.13.3 eludes to this.

            bufferIndex += this.byteCount;
        }

        final int len = bufferIndex - start;

When there is an operation that will require waiting before giving the results and has support for these new Python features, you can code it like:

```Python
burgers = await get_burgers(2)
```

Les routes sont déclarées à un seul endroit, en utilisant des fonctions déclarées à d'autres endroits (au lieu
d'utiliser des décorateurs qui peuvent être placés juste au-dessus de la fonction qui gère l'endpoint). Cette
méthode est plus proche de celle de Django que de celle de Flask (et Starlette). Il sépare dans le code des choses
qui sont relativement fortement couplées.

/// check | A inspiré **FastAPI** à

		fi.Checksum = crcs
	}
	return fi, nil
}

// Read at most this much on initial read.
const metaDataReadDefault = 4 << 10

// Return used metadata byte slices here.
var metaDataPool = bpool.Pool[[]byte]{New: func() []byte { return make([]byte, 0, metaDataReadDefault) }}

// metaDataPoolGet will return a byte slice with capacity at least metaDataReadDefault.
// It will be length 0.