return null;
        }

        final File parentFile = uploadFile.getParentFile();
        if (!parentFile.exists() && !parentFile.mkdirs()) {
            logger.warn("Could not create directory: {}", parentFile.getAbsolutePath());
        }

        try {
            write(uploadFile.getAbsolutePath(), form.designFile.getFileData());
            final String currentFileName = fileName;

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

You will get completion in code you might even consider impossible before. As for example, the `price` key inside a JSON body (that could have been nested) that comes from a request.

No more typing the wrong key names, coming back and forth between docs, or scrolling up and down to find if you finally used `username` or `user_name`.

### Short { #short }

  }

  // We can't use Character.isSurrogate(c) because of GWT.

  public void testEncodedLength_validStrings() {
    assertEquals(0, Utf8.encodedLength(""));
    assertEquals(11, Utf8.encodedLength("Hello world"));
    assertEquals(8, Utf8.encodedLength("Résumé"));
    assertEquals(
        461,
        Utf8.encodedLength(
            "威廉·莎士比亞（William Shakespeare，"
                + "1564年4月26號—1616年4月23號[1]）係隻英國嗰演員、劇作家同詩人，"

  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~
  public void testConcat_overflow_negative() {
    int dim1 = 1 << 16;
    int dim2 = 1 << 15;
    assertThat(dim1 * dim2).isLessThan(0);
    testConcatOverflow(dim1, dim2);
  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~

	tests := []struct {
		name    string
		data    []byte
		wantIdx bool
	}{
		{name: "empty", data: nil},
		{name: "small", data: []byte("hello, world!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")},
		{name: "large", data: bytes.Repeat([]byte("hello, world"), 1000000), wantIdx: true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {

			wants:       nil,
			wantExpired: []ObjectToDelete{{ObjectV: ObjectV{ObjectName: obj, VersionID: allVersExpObjInfos[0].VersionID}}},
		},
		{
			// When no versions are present, in practice this could be an object with only free versions
			objInfos:    nil,
			wants:       nil,
			wantExpired: nil,
		},
	}
	for i, test := range tests {

			t.Errorf("got string %q; want %q", b.String(), s)
		}
		if r.Len() != 0 {
			t.Errorf("reader contains %v bytes; want 0", r.Len())
		}
	}
}

func TestReaderLen(t *testing.T) {
	const data = "hello world"
	r := NewReader([]byte(data))
	if got, want := r.Len(), 11; got != want {
		t.Errorf("r.Len(): got %d, want %d", got, want)
	}
	if n, err := r.Read(make([]byte, 10)); err != nil || n != 10 {

```

那列顯示了你的應用程式正在本地端機器上運行的 URL。

### 查看它

在瀏覽器中打開 <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

你將看到如下的 JSON 回應：

```JSON
{"message": "Hello World"}
```

### 互動式 API 文件

現在，前往 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

해당 줄은 로컬에서 앱이 서비스되는 URL을 보여줍니다.

### 확인하기

브라우저로 <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>를 여세요.

아래와 같은 JSON 응답을 볼 수 있습니다:

```JSON
{"message": "Hello World"}
```

### 대화형 API 문서

이제 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>로 가봅니다.

Відкрийте браузер та введіть адресу <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

Ви побачите у відповідь таке повідомлення у форматі JSON:

```JSON
{"message": "Hello World"}
```

### Інтерактивна API документація

Перейдемо сюди <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.