│   │   ├── items.py     # 「items」子模块，例如 import app.routers.items
│   │   └── users.py     # 「users」子模块，例如 import app.routers.users
│   └── internal         # 「internal」是一个「Python 子包」
│       ├── __init__.py  # 使「internal」成为一个「Python 子包」
│       └── admin.py     # 「admin」子模块，例如 import app.internal.admin
```

## `APIRouter`

假设专门用于处理用户逻辑的文件是位于 `/app/routers/users.py` 的子模块。

你希望将与用户相关的*路径操作*与其他代码分开，以使其井井有条。

):
    response = await call_next(request)
    response.headers["custom"] = "foo"
    return response


@app.get("/user", dependencies=[Depends(set_up_request_state_dependency)])
def get_user():
    request_state = legacy_request_state_context_var.get()
    assert request_state
    return request_state["user"]


client = TestClient(app)


def test_dependency_contextvars():
    """

./mc ready myminio

./mc admin user add myminio/ minio123 minio123
./mc admin user add myminio/ minio12345 minio12345

./mc admin policy create myminio/ rw ./docs/distributed/rw.json
./mc admin policy create myminio/ lake ./docs/distributed/rw.json

./mc admin policy attach myminio/ rw --user=minio123
./mc admin policy attach myminio/ lake --user=minio12345

./mc mb -l myminio/versioned

            if (!Files.isRegularFile(userToolchainsFile)) {
                throw new FileNotFoundException(
                        "The specified user toolchains file does not exist: " + userToolchainsFile);
            }
        } else {
            String userToolchainsFileStr =

        return versionRangeViolations != null;
    }

    /**
     * TODO this needs to accept a {@link OverConstrainedVersionException} as returned by
     *       {@link #getVersionRangeViolation(int)} but it's not used like that in
     *       {@link org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector}
     */
    public MetadataResolutionResult addVersionRangeViolation(Exception e) {

    // --------------------------/

    /**
     * If set the parser will be loaded with all single characters
     * from the XHTML specification.
     * The entities used:
     * <ul>
     * <li>http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent</li>
     * <li>http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent</li>
     * <li>http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent</li>
     * </ul>
     */

                this.projects = map;
            } else {
                return Collections.emptyMap();
            }
        }
        return projects;
    }

    /**
     * Singleton class used to receive events by implementing the EventSpy.
     * It simply forwards all {@code ExecutionEvent}s to the {@code ReactorReader}.
     */
    @Named
    @Singleton
    @SuppressWarnings("unused")

Теперь запустите Traefik:

<div class="termy">

```console
$ ./traefik --configFile=traefik.toml

INFO[0000] Configuration loaded from file: /home/user/awesomeapi/traefik.toml
```

</div>

И запустите приложение с опцией `--root-path`:

<div class="termy">

```console
$ fastapi run main.py --forwarded-allow-ips="*" --root-path /api/v1

{* ../../docs_src/response_model/tutorial003_py310.py hl[9,11,16] *}

Obwohl unsere *Pfadoperation-Funktion* hier denselben `user` von der Eingabe zurückgibt, der das Passwort enthält:

{* ../../docs_src/response_model/tutorial003_py310.py hl[24] *}

	buf := *(*[]byte)(unsafe.Pointer(&h))
	return r.Write(buf)
}

// Bytes returns all available read bytes.
// It does not move the read pointer and only copy the available data.
// If the dst is big enough it will be used as destination,
// otherwise a new buffer will be allocated.
func (r *RingBuffer) Bytes(dst []byte) []byte {
	r.mu.Lock()
	defer r.mu.Unlock()
	getDst := func(n int) []byte {
		if cap(dst) < n {