<span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Uvicorn running on <font color="#729FCF"><u style="text-decoration-style:solid">http://0.0.0.0:8000</u></font> <b>(</b>Press CTRL+C
             to quit<b>)</b>
```

</div>

That would work for most of the cases. 😎

You could use that command for example to start your **FastAPI** app in a container, in a server, etc.

            .build()

        val exchange = call.interceptorScopedExchange
        val followUp = followUpRequest(response, exchange)

        if (followUp == null) {
          if (exchange != null && exchange.isDuplex) {
            call.timeoutEarlyExit()
          }
          closeActiveExchange = false
          call.eventListener.followUpDecision(call, response, null)
          return response
        }

 * [GoogleAppEngineOkHttp](https://github.com/apkelly/GoogleAppEngineOkHttp): An OkHttp Call that works on Google App Engine.
 * [Hunter](https://github.com/Leaking/Hunter): Configure all OkHttpClients centrally.
 * ⬜️ [Moshi](https://github.com/square/moshi): A modern JSON library for Android and Java.
 * [Ok2Curl](https://github.com/mrmike/Ok2Curl): Convert OkHttp requests into curl logs.

## 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.

### Top-level application { #top-level-application }

        @Override
        public void call(Listener listener) {
          listener.starting();
        }

        @Override
        public String toString() {
          return "starting()";
        }
      };
  private static final ListenerCallQueue.Event<Listener> RUNNING_EVENT =
      new ListenerCallQueue.Event<Listener>() {
        @Override
        public void call(Listener listener) {
          listener.running();

        final CurlRequest postRequest = Curl.post(emptyUrl);
        final CurlRequest putRequest = Curl.put(emptyUrl);
        final CurlRequest deleteRequest = Curl.delete(emptyUrl);
        final CurlRequest headRequest = Curl.head(emptyUrl);
        final CurlRequest optionsRequest = Curl.options(emptyUrl);
        final CurlRequest connectRequest = Curl.connect(emptyUrl);

        // ## Assert ##

If you look at it, *path operation functions* are declared to be used whenever a *path* and *operation* matches, and then **FastAPI** takes care of calling the function with the correct parameters, extracting the data from the request.

Actually, all (or most) of the web frameworks work in this same way.

You never call those functions directly. They are called by your framework (in this case, **FastAPI**).

             Logs:

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Uvicorn running on <font color="#729FCF"><u style="text-decoration-style:solid">http://0.0.0.0:8000</u></font> <b>(</b>Press CTRL+C to
             quit<b>)</b>
     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Started parent process <b>[</b><font color="#34E2E2"><b>27365</b></font><b>]</b>

## Version 5.3.0

_2025-10-30_

 *  New: Add tags to `Call`, including computable tags. Use this to attach application-specific
    metadata to a `Call` in an `EventListener` or `Interceptor`. The tag can be read in any other
    `EventListener` or `Interceptor`.

    ```kotlin
      override fun intercept(chain: Interceptor.Chain): Response {
        chain.call().tag(MyAnalyticsTag::class) {
          MyAnalyticsTag(...)
        }

# Allow the root user to perform any action.
allow {
 input.owner == true
}

# All other users may do anything other than call PutObject
allow {
 input.action != "s3:PutObject"
 input.owner == false
}
EOF
```

Then load the policy via OPA's REST API.

```
curl -X PUT --data-binary @example.rego \
  localhost:8181/v1/policies/putobject
```

### 4. Setup MinIO with OPA