With rewrites, redirects, follow-ups and retries, your simple request may yield many requests and responses. OkHttp uses `Call` to model the task of satisfying your request through however many intermediate requests and responses are necessary. Typically this isn’t many! But it’s comforting to know that your code will continue to work if your URLs are redirected or if you failover to an alternate IP address.

@setlocal

@REM ==== START VALIDATION ====
if not "%JAVA_HOME%" == "" goto OkJHome

echo. >&2
echo Error: JAVA_HOME not found in your environment. >&2
echo Please set the JAVA_HOME variable in your environment to match the >&2
echo location of your Java installation. >&2
echo. >&2
goto error

:OkJHome
if exist "%JAVA_HOME%\bin\java.exe" goto init

echo. >&2

```console
$ pip install -r requirements.txt

---> 100%
```

</div>

It will install all the dependencies and your local FastAPI in your local environment.

### Using your local FastAPI

If you create a Python file that imports and uses FastAPI, and run it with the Python from your local environment, it will use your cloned local FastAPI source code.

var AWS = require('aws-sdk');

var s3  = new AWS.S3({
    accessKeyId: 'YOUR-ACCESSKEYID' ,
    secretAccessKey: 'YOUR-SECRETACCESSKEY' ,
    endpoint: 'http://127.0.0.1:9000' ,
    s3ForcePathStyle: true,
    signatureVersion: 'v4'
});

// List all contents stored in the zip archive
s3.listObjectsV2({Bucket : 'your-bucket', Prefix: 'path/to/file.zip/'}).
    on('build', function(req) { req.httpRequest.headers['X-Minio-Extract'] = 'true'; }).

```

In this case, `item_id` is declared to be an `int`.

/// check

This will give you editor support inside of your function, with error checks, completion, etc.

///

## Data <abbr title="also known as: serialization, parsing, marshalling">conversion</abbr>

```Dockerfile
COPY ./app /code/app
```

### Build the Docker Image

Now that all the files are in place, let's build the container image.

* Go to the project directory (in where your `Dockerfile` is, containing your `app` directory).
* Build your FastAPI image:

<div class="termy">

```console
$ docker build -t myimage .

---> 100%
```

</div>

/// tip

* `title`: the title of your API.
* `oauth2_redirect_url`: you can use `app.swagger_ui_oauth2_redirect_url` here to use the default.
* `swagger_js_url`: the URL where the HTML for your Swagger UI docs can get the **JavaScript** file. This is the custom CDN URL.

The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).

But the client/user will not see it. Instead, the client will receive an "Internal Server Error" with an HTTP status code `500`.

It should be this way because if you have a Pydantic `ValidationError` in your *response* or anywhere in your code (not in the client's *request*), it's actually a bug in your code.

service iptables restart
```

## Test MinIO Connectivity

### Test using MinIO Console

MinIO Server comes with an embedded web based object browser. Point your web browser to <http://127.0.0.1:9000> to ensure your server has started successfully.

> NOTE: MinIO runs console on random port by default, if you wish to choose a specific port use `--console-address` to pick a specific interface and port.