```txt
Hello, World from Flask!
```

Und wenn Sie auf [http://localhost:8000/v2](http://localhost:8000/v2) gehen, sehen Sie die Response von FastAPI:

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

    Request request = new Request.Builder()
      .url(HttpUrl.get("https://square.com/"))
      .tag(Integer.class, 5)
      .tag(String.class, "hello")
      .build();
    Call call = client.newCall(request);

    assertEquals(5, call.tag(Integer.class));
    assertEquals("hello", call.tag(String.class));
    assertEquals(null, call.tag(Boolean.class));
    assertEquals(null, call.tag(Object.class));
  }

  @Test

Si vous l'exécutez et allez à [http://localhost:8000/v1/](http://localhost:8000/v1/) vous verrez la réponse de Flask :

```txt
Hello, World from Flask!
```

Et si vous allez à [http://localhost:8000/v2](http://localhost:8000/v2) vous verrez la réponse de FastAPI :

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

    "data": "aGVsbG8="
}
```

/// tip

`aGVsbG8=` is the base64 encoding of `hello`.

///

And then Pydantic will decode the base64 string and give you the original bytes in the `data` field of the model.

You will receive a response like:

```json
{
  "description": "Some data",
  "content": "hello"
}
```

## Pydantic `bytes` for Output Data { #pydantic-bytes-for-output-data }

  }

  @Test fun get() {
    server.enqueue(MockResponse(body = "hello, Jetty HTTP Client"))

    val request =
      client
        .newRequest(server.url("/").toUri())
        .header("Accept", "text/plain")
    val response = request.send()
    assertThat(response.status).isEqualTo(200)
    assertThat(response.contentAsString).isEqualTo("hello, Jetty HTTP Client")

    val recorded = server.takeRequest()

    assertHash(679745764, murmur3_32().hashUnencodedChars("k"));
    assertHash(1510782915, murmur3_32().hashUnencodedChars("hell"));
    assertHash(-675079799, murmur3_32().hashUnencodedChars("hello"));
    assertHash(1935035788, murmur3_32().hashUnencodedChars("http://www.google.com/"));
    assertHash(
        -528633700, murmur3_32().hashUnencodedChars("The quick brown fox jumps over the lazy dog"));
  }

    server.enqueue(MockResponse(body = "hello, OkHttp"))

    val client = OkHttpClient()

    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .header("Accept", "text/plain")
        .build()
    val response = client.newCall(request).execute()
    assertThat(response.code).isEqualTo(200)
    assertThat(response.body.string()).isEqualTo("hello, OkHttp")

```python
from asyncer import asyncify
from fastapi import FastAPI

app = FastAPI()


def do_blocking_work(name: str) -> str:
    # Some blocking I/O operation
    return f"Hello {name}"


@app.get("/items/")
async def read_items():
    result = await asyncify(do_blocking_work)(name="World")
    return {"message": result}
```

    assertHash(679745764, murmur3_32().hashUnencodedChars("k"));
    assertHash(1510782915, murmur3_32().hashUnencodedChars("hell"));
    assertHash(-675079799, murmur3_32().hashUnencodedChars("hello"));
    assertHash(1935035788, murmur3_32().hashUnencodedChars("http://www.google.com/"));
    assertHash(
        -528633700, murmur3_32().hashUnencodedChars("The quick brown fox jumps over the lazy dog"));
  }

    assertThat(Buffer().writeByte(0xc0).isProbablyUtf8(16L)).isFalse()
  }

  @Test fun doesNotConsumeBuffer() {
    val buffer = Buffer()
    buffer.writeUtf8("hello ".repeat(1024))
    assertThat(buffer.isProbablyUtf8(100L)).isTrue()
    assertThat(buffer.readUtf8()).isEqualTo("hello ".repeat(1024))
  }

  /** Confirm [isProbablyUtf8] doesn't attempt to read the entire stream. */
  @Test fun doesNotReadEntireSource() {