/// note | 技術細節

ASGI 規格針對這種用例定義了 `root_path`。

而命令列選項 `--root-path` 就是提供該 `root_path`。

///

### 檢視目前的 `root_path` { #checking-the-current-root-path }

你可以在每個請求中取得應用使用的 `root_path`，它是 `scope` 字典的一部分（ASGI 規格的一部分）。

這裡我們把它放到回傳訊息中只是為了示範。

{* ../../docs_src/behind_a_proxy/tutorial001_py310.py hl[8] *}

接著，如果你用下列方式啟動 Uvicorn：

<div class="termy">

```console

import org.eclipse.aether.internal.impl.scope.ManagedDependencyContextRefiner;
import org.eclipse.aether.internal.impl.scope.ManagedScopeDeriver;
import org.eclipse.aether.internal.impl.scope.ManagedScopeSelector;
import org.eclipse.aether.internal.impl.scope.OptionalDependencySelector;
import org.eclipse.aether.internal.impl.scope.ScopeDependencySelector;
import org.eclipse.aether.internal.impl.scope.ScopeManagerImpl;

        <version>1.0</version>
      </dependency>
      <dependency>
        <groupId>maven-test</groupId>
        <artifactId>t07-d</artifactId>
        <version>1.0</version>
        <scope>test</scope>
        <optional>false</optional>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t07-a</artifactId>

    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t05-b</artifactId>
      <version>1.0</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <packaging>jar</packaging>
  <version>1.0</version>

  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t09-c</artifactId>
      <version>1.0</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <packaging>jar</packaging>
  <version>1.0</version>

  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t09-c</artifactId>
      <version>1.0</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

### `scope` { #scope }

La spécification indique aussi que le client peut envoyer un autre champ de formulaire « scope ».

Le nom du champ de formulaire est `scope` (au singulier), mais il s'agit en fait d'une longue chaîne contenant des « scopes » séparés par des espaces.

Chaque « scope » n'est qu'une chaîne (sans espaces).

  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t05-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t08-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

Bir `Request`'in, request ile ilgili metadata'yı içeren bir Python `dict` olan `request.scope` attribute'u vardır.

Bir `Request` ayrıca `request.receive` içerir; bu, request'in body'sini "almak" (receive etmek) için kullanılan bir fonksiyondur.

`scope` `dict`'i ve `receive` fonksiyonu, ASGI spesifikasyonunun parçalarıdır.

Ve bu iki şey, `scope` ve `receive`, yeni bir `Request` instance'ı oluşturmak için gerekenlerdir.