Sebastián Ramírez <******@****.***> 1589724233 +0200

If you need to have two independent FastAPI applications, with their own independent OpenAPI and their own docs UIs, you can have a main app and "mount" one (or more) sub-application(s).

## Mounting a **FastAPI** application { #mounting-a-fastapi-application }

"Mounting" means adding a completely "independent" application in a specific path, that then takes care of handling everything under that path, with the _path operations_ declared in that sub-application.

    private final CountDownLatch stopLatch = new CountDownLatch(1);

    private volatile boolean running = false;

    @Override
    public @Nullable Void call() throws InterruptedException {
      running = true;
      startLatch.countDown();
      stopLatch.await();
      running = false;
      return null;
    }

    void waitForStart() throws InterruptedException {

## Монтирование приложения **FastAPI** { #mounting-a-fastapi-application }

«Монтирование» означает добавление полностью независимого приложения по конкретному пути; далее оно будет обрабатывать всё под этим путём, используя объявленные в подприложении _операции пути_.

that the sponge is being squeezed. spongeSqueezing ) type Digest struct { a [1600 / 8]byte // main state of the hash // a[n:rate] is the buffer. If absorbing, it's the remaining space to XOR // into before running the permutation. If squeezing, it's the remaining // output to produce before running the permutation. n, rate int // dsbyte contains the "domain separation" bits and the first bit of // the padding. Sections 6.1 and 6.2 of [1] separate the outputs of the // SHA-3 and SHAKE functions by appending...

{* ../../docs_src/behind_a_proxy/tutorial004_py310.py hl[9] *}

and then it won't include it in the OpenAPI schema.

## Mounting a sub-application { #mounting-a-sub-application }

If you need to mount a sub-application (as described in [Sub Applications - Mounts](sub-applications.md)) while also using a proxy with `root_path`, you can do it normally, as you would expect.

# Benchmarks { #benchmarks }

Independent TechEmpower benchmarks show **FastAPI** applications running under Uvicorn as [one of the fastest Python frameworks available](https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l=zijzen-7), only below Starlette and Uvicorn themselves (used internally by FastAPI).

But when checking benchmarks and comparisons you should keep the following in mind.

# 子应用 - 挂载 { #sub-applications-mounts }

如果需要两个独立的 FastAPI 应用，拥有各自独立的 OpenAPI 与文档，则需设置一个主应用，并**挂载**一个（或多个）子应用。

## 挂载 **FastAPI** 应用 { #mounting-a-fastapi-application }

**挂载**是指在特定路径中添加完全**独立**的应用，然后在该路径下使用*路径操作*声明的子应用处理所有事务。

### 顶层应用 { #top-level-application }

首先，创建主（顶层）**FastAPI** 应用及其*路径操作*：

{* ../../docs_src/sub_applications/tutorial001_py310.py hl[3, 6:8] *}

### 子应用 { #sub-application }

接下来，创建子应用及其*路径操作*。

## Eine **FastAPI**-Anwendung mounten { #mounting-a-fastapi-application }

    private final CountDownLatch stopLatch = new CountDownLatch(1);

    private volatile boolean running = false;

    @Override
    public @Nullable Void call() throws InterruptedException {
      running = true;
      startLatch.countDown();
      stopLatch.await();
      running = false;
      return null;
    }

    void waitForStart() throws InterruptedException {