// head method
                        responseData =
                                client.execute(RequestDataBuilder.newRequestData().head().url(url).weight(urlQueue.getWeight()).build());
                        if (responseData == null) {
                            return true;
                        }

# Primeiros Passos { #first-steps }

O arquivo FastAPI mais simples pode se parecer com:

{* ../../docs_src/first_steps/tutorial001_py39.py *}

Copie o conteúdo para um arquivo `main.py`.

Execute o servidor:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>

        final SearchRequestBuilder builder = client.prepareSearch(index);
        builder.setSize(size);
        builder.setQuery(buildQuery());
        builder.setRescorer(buildRescore(), windowSize);

        builder.execute(new ActionListener<SearchResponse>() {
            @Override
            public void onResponse(final SearchResponse searchResponse) {
                if (searchResponse.getFailedShards() > 0) {

        Files.createDirectories(userConf);
        Path userExtensions = userConf.resolve("settings.xml");
        Files.writeString(userExtensions, settingsXml);

        // we just execute a Mojo for downloading it only and to assert from which URL it came
        Map<String, String> logs = invoke(
                cwd,
                userHome,

A "**callable**" in Python is anything that Python can "call" like a function.

So, if you have an object `something` (that might _not_ be a function) and you can "call" it (execute it) like:

```Python
something()
```

or

```Python
something(some_argument, some_keyword_argument="foo")
```

then it is a "callable".

 * until [nextPart] returns null. After calling [nextPart] any preceding parts should not be read.
 *
 * Typical use loops over the parts in sequence:
 *
 * ```kotlin
 * val response: Response = call.execute()
 * val multipartReader = MultipartReader(response.body!!)
 *
 * multipartReader.use {
 *   while (true) {
 *     val part = multipartReader.nextPart() ?: break
 *     process(part.headers, part.body)
 *   }
 * }

        it.proceed(it.request())
      }.build()

  private fun makeRequest(client: OkHttpClient): Handshake {
    val call = client.newCall(Request(server.url("/")))
    return call.execute().use { it.handshake!! }
  }

É opcional usá-la, mas é onde você colocaria a identificação do usuário, então nós estamos usando aqui.

O JWT pode ser usado para outras coisas além de identificar um usuário e permitir que ele execute operações diretamente na sua API.

Por exemplo, você poderia identificar um "carro" ou uma "postagem de blog".

 * tools to pre-populate this repository
 *
 * h3. create an isolated classloader
 *
 * h3. lookup the plugin with a configuration
 *
 * h3. execute the plugin
 *
 * h3. plugins may have to deal with particular actions when a plugin is - installed - loaded -
 * unloaded - update - uninstalled
 *

  }

  private fun executeSynchronously(request: Request): RecordedResponse {
    val call = client.newCall(request)
    return try {
      val response = call.execute()
      val bodyString = response.body.string()
      RecordedResponse(request, response, null, bodyString, null)
    } catch (e: IOException) {
      RecordedResponse(request, null, null, null, e)
    }
  }