与其他响应类型相比，接受不同的参数集进行实例化：

* `path` - 要流式传输的文件的文件路径。
* `headers` - 任何自定义响应头，传入字典类型。
* `media_type` - 给出媒体类型的字符串。如果未设置，则文件名或路径将用于推断媒体类型。
* `filename` - 如果给出，它将包含在响应的 `Content-Disposition` 中。

文件响应将包含适当的 `Content-Length`，`Last-Modified` 和 `ETag` 的响应头。

```Python hl_lines="2  10"
{!../../docs_src/custom_response/tutorial009.py!}
```

## 额外文档

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python
commons: CommonQueryParams = Depends(CommonQueryParams)
```

////

The last `CommonQueryParams`, in:

```Python
... Depends(CommonQueryParams)
```

...is what **FastAPI** will actually use to know what is the dependency.

        bytesOut.writeHexadecimalUnsignedLong(chunkSize)
        bytesOut.writeUtf8("\r\n")
        bytesOut.write(body, chunkSize)
        bytesOut.writeUtf8("\r\n")
      }
      bytesOut.writeUtf8("0\r\n") // Last chunk. Trailers follow!
      this.body = bytesOut.toMockResponseBody()
    }

    /**
     * Sets the response body to the UTF-8 encoded bytes of [body],
     * chunked every [maxChunkSize] bytes.
     */

    Map<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }

    // Explicitly call `equals`; `assertEquals` might return fast
    assertTrue(map.equals(map));
    assertTrue(makePopulatedMap().equals(map));
    assertFalse(map.equals(emptyMap()));
    // no-inspection ObjectEqualsNull
    assertFalse(map.equals(null));
  }

### Parallel Hamburgerler

Şimdi bunların "Eşzamanlı Hamburger" değil, "Paralel Hamburger" olduğunu düşünelim.

Hamburger 🍔 almak için 😍 aşkınla Paralel fast food'a gidiyorsun.

Birden fazla kasiyer varken (varsayalım 8) sıraya girdiniz👩‍🍳👨‍🍳👩‍🍳👨‍🍳👩‍🍳👨‍🍳👩‍🍳👨‍🍳 ve sıranız gelene kadar bekliyorsunuz.

                            if ( log.isDebugEnabled() ) {
                                log.debug(
                                    String.format(
                                        "Wrote %d bytes (%d chunks, last partial write %d)",
                                        r.getTotalBytesWritten(),
                                        r.getChunksWritten(),
                                        r.getChunkBytesWritten()));

* `path` - 📁 📁 🎏.
* `headers` - 🙆 🛃 🎚 🔌, 📖.
* `media_type` - 🎻 🤝 📻 🆎. 🚥 🔢, 📁 ⚖️ ➡ 🔜 ⚙️ 🔑 📻 🆎.
* `filename` - 🚥 ⚒, 👉 🔜 🔌 📨 `Content-Disposition`.

📁 📨 🔜 🔌 ☑ `Content-Length`, `Last-Modified` & `ETag` 🎚.

```Python hl_lines="2  10"
{!../../docs_src/custom_response/tutorial009.py!}
```

👆 💪 ⚙️ `response_class` 🔢:

```Python hl_lines="2  8  10"

        DefaultModelBuildingRequest request = new DefaultModelBuildingRequest();
        request.setModelSource(new FileModelSource(new File(
                getClass().getResource("/poms/depmgmt/root-dep-last.xml").getFile())));
        request.setModelResolver(new BaseModelResolver() {
            public ModelSource resolveModel(org.apache.maven.model.Dependency dependency)
                    throws UnresolvableModelException {

### Kort

Dit framework heeft voor alles verstandige **standaardinstellingen**, met overal optionele configuraties. Alle parameters kunnen worden verfijnd zodat het past bij wat je nodig hebt, om zo de API te kunnen definiëren die jij nodig hebt.

Maar standaard werkt alles **“gewoon”**.

### Validatie

RegExp("^\\.("+t+")"),TAG:new RegExp("^("+t+"|[*])"),ATTR:new RegExp("^"+p),PSEUDO:new RegExp("^"+g),CHILD:new RegExp("^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\("+ge+"*(even|odd|(([+-]|)(\\d*)n|)"+ge+"*(?:([+-]|)"+ge+"*(\\d+)|))"+ge+"*\\)|)","i"),bool:new RegExp("^(?:"+f+")$","i"),needsContext:new RegExp("^"+ge+"*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\("+ge+"*((?:-\\d)?\\d*)"+ge+"*\\)|)(?=[^-]|$)","i")},N=/^(?:input|select|textarea|button)$/i,q=/^h\d$/i,L=/^(?:#([\w-]+)|(\w+)|...