```

### Testen

Sobald Sie auf <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a> gehen, werden Sie sehen, dass Ihr benutzerdefiniertes Logo verwendet wird (in diesem Beispiel das Logo von **FastAPI**):

  # Start of custom modified logic
  # Logo
  - &logo >-
    {%- if layout.logo -%}
      {{ layout.logo }}
    {%- elif config.theme.logo -%}
      {{ config.docs_dir }}/{{ config.theme.logo }}
    {%- endif -%}
  # End of custom modified logic

  # Logo (icon)
  - &logo_icon >-
    {{ config.theme.icon.logo or "" }}

# Meta tags
tags:

  # Open Graph

## 覆盖默认值

`get_openapi()` 工具函数还可以用于生成 OpenAPI 概图，并利用上述信息参数覆盖指定的内容。

例如，使用 <a href="https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md#x-logo" class="external-link" target="_blank">ReDoc 的 OpenAPI 扩展添加自定义 Logo</a>。

### 常规 **FastAPI**

首先，编写常规 **FastAPI** 应用：

```Python hl_lines="1  4  7-9"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### 生成 OpenAPI 概图

        description="Here's a longer description of the custom **OpenAPI** schema",
        routes=app.routes,
    )
    openapi_schema["info"]["x-logo"] = {
        "url": "https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png"
    }
    app.openapi_schema = openapi_schema
    return app.openapi_schema

    val requestBody =
      MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("title", "Square Logo")
        .addFormDataPart(
          "image",
          "logo-square.png",
          File("docs/images/logo-square.png").asRequestBody(MEDIA_TYPE_PNG),
        )
        .build()

    val request =
      Request.Builder()

            "description": "Here's a longer description of the custom **OpenAPI** schema",
            "version": "2.5.0",
            "x-logo": {
                "url": "https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png"
            },
        },
        "paths": {
            "/items/": {
                "get": {
                    "responses": {
                        "200": {

      <url>siteDistributionUrl</url>
    </site>
  </distributionManagement>

  <organization>
    <name>Apache Software Foundation</name>
    <url>http://apache.org/</url>
    <logo>/images/jakarta-logo-blue.gif</logo>
  </organization>

  <scm>
    <connection>anon-connection</connection>
    <developerConnection>developer-connection</developerConnection>
    <url>repository-url</url>
  </scm>

[![GoDoc](https://godoc.org/istio.io/istio?status.svg)](https://godoc.org/istio.io/istio)

<a href="https://istio.io/">
    <img src="https://github.com/istio/istio/raw/master/logo/istio-bluelogo-whitebackground-unframed.svg"
         alt="Istio logo" title="Istio" height="100" width="100" />
</a>

---

For example, let's add <a href="https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md#x-logo" class="external-link" target="_blank">ReDoc's OpenAPI extension to include a custom logo</a>.

### Normal **FastAPI**

First, write all your **FastAPI** application as normally:

```Python hl_lines="1  4  7-9"

    RequestBody requestBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("title", "Square Logo")
        .addFormDataPart("image", "logo-square.png",
            RequestBody.create(
                new File("docs/images/logo-square.png"),
                MEDIA_TYPE_PNG))
        .build();

    Request request = new Request.Builder()