## Recap { #recap }

///

### Lifespan function { #lifespan-function }

The first thing to notice, is that we are defining an async function with `yield`. This is very similar to Dependencies with `yield`.

{* ../../docs_src/events/tutorial003_py39.py hl[14:19] *}

The first part of the function, before the `yield`, will be executed **before** the application starts.

    - [Container Images](#container-images)
  - [Changelog since v1.34.2](#changelog-since-v1342)
  - [Changes by Kind](#changes-by-kind)
    - [Feature](#feature)
    - [Bug or Regression](#bug-or-regression)
  - [Dependencies](#dependencies)
    - [Added](#added)
    - [Changed](#changed)
    - [Removed](#removed)
- [v1.34.2](#v1342)
  - [Downloads for v1.34.2](#downloads-for-v1342)
    - [Source Code](#source-code-1)

不過，在這兩種情況下，**FastAPI** [仍然很快](index.md#_11){.internal-link target=_blank}至少與你之前的框架相當（或者更快）。

### 依賴項(Dependencies)

同樣適用於[依賴項](tutorial/dependencies/index.md){.internal-link target=_blank}。如果依賴項是一個標準的 `def` 函式，而不是 `async def`，那麼它在外部的執行緒池被運行。

### 子依賴項

///

### WebSockets mit Abhängigkeiten ausprobieren { #try-the-websockets-with-dependencies }

Wenn Ihre Datei `main.py` heißt, führen Sie Ihre Anwendung mit Folgendem aus:

<div class="termy">

```console
$ fastapi dev main.py

        writer.accept("=== PROJECT BUILD PLAN ================================================");
        writer.accept("Project:                     " + getKey(project));
        writer.accept("Repositories (dependencies): " + project.getRemoteProjectRepositories());
        writer.accept("Repositories (plugins):      " + project.getRemotePluginRepositories());

        Optional<BuildStep> planStep = plan.step(project, BuildStep.PLAN);

import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.plugin.descriptor.MojoDescriptor;

// TODO lifecycles being executed
// TODO what runs in each phase
// TODO plugins that need downloading
// TODO project dependencies that need downloading
// TODO unfortunately the plugins need to be downloaded in order to get the plugin.xml file. need to externalize this
//      from the plugin archive.

* It can do something to that **response** or run any needed code.
* Then it returns the **response**.

/// note | Technical Details

If you have dependencies with `yield`, the exit code will run *after* the middleware.

### 2. Run MinIO in federated mode

Bucket lookup from DNS federation requires two dependencies

- etcd (for bucket DNS service records)
- CoreDNS (for DNS management based on populated bucket DNS service records, optional)

## Architecture

    get_compat_model_name_map,
    get_definitions,
    get_schema_from_model_field,
    lenient_issubclass,
)
from fastapi.datastructures import DefaultPlaceholder
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (
    _get_flat_fields_from_params,
    get_flat_dependant,
    get_flat_params,
    get_validation_alias,
)
from fastapi.encoders import jsonable_encoder