## Montar una aplicación **FastAPI**

"Montar" significa añadir una aplicación completamente "independiente" en un path específico, que luego se encarga de manejar todo bajo ese path, con las _path operations_ declaradas en esa sub-aplicación.

### Aplicación de nivel superior

Primero, crea la aplicación principal de nivel superior de **FastAPI**, y sus *path operations*:

{* ../../docs_src/sub_applications/tutorial001.py hl[3, 6:8] *}

### Sub-aplicación

    /**
     * Creates a GET request for the specified path.
     * @param path the request path
     * @return the configured CurlRequest
     */
    public CurlRequest get(final String path) {
        return request(Method.GET, path).header("Content-Type", "application/json");
    }

    /**
     * Creates a POST request for the specified path.
     * @param path the request path
     * @return the configured CurlRequest
     */

ItemsService.createItemItemsPost({name: "Plumbus", price: 5})
```

...that's because the client generator uses the OpenAPI internal **operation ID** for each *path operation*.

OpenAPI requires that each operation ID is unique across all the *path operations*, so FastAPI uses the **function name**, the **path**, and the **HTTP method/operation** to generate that operation ID, because that way it can make sure that the operation IDs are unique.

import okhttp3.Request
import okhttp3.RequestBody.Companion.asRequestBody
import okio.Path.Companion.toPath
import okio.buffer
import okio.fakefilesystem.FakeFileSystem

class PostPath {
  private val client = OkHttpClient()
  private val fileSystem = FakeFileSystem()
  val path = "test.json".toPath()

  fun run() {
    fileSystem.write(path) {
      writeUtf8("{}")
    }

    val request =
      Request

FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.context.path=$FESS_CONTEXT_PATH"
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.port=$FESS_PORT"
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.webapp.path=$FESS_HOME/app"
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.temp.path=$FESS_TEMP_PATH"
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.log.name=$APP_NAME"
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfess.log.path=$FESS_LOG_PATH"

                    )
            }.joinToString(",") { javaHome(it, this, arch) }
        return listOf(
            """"-Dorg.gradle.java.installations.paths=$paths"""",
            """"-Porg.gradle.java.installations.paths=$paths"""",
        )
    }

	. "$DEFAULT"
fi

# Define other required variables
PID_FILE="$PID_DIR/$NAME.pid"
DAEMON=$FESS_HOME/bin/fess
DAEMON_OPTS="-d -p $PID_FILE --default.path.conf=$CONF_DIR --default.path.home=$FESS_HOME --default.path.logs=$LOG_DIR --default.path.data=$DATA_DIR"

export FESS_HEAP_SIZE
export FESS_HEAP_NEWSIZE
export FESS_DIRECT_SIZE
export FESS_JAVA_OPTS
export FESS_TEMP_PATH
export FESS_LOG_PATH

	flag.DurationVar(&margin, "margin", 0, "margin time")
	flag.StringVar(&searchText, "search", "", "Regex to search for a text in one goroutine stacktrace")
}

func parseGoroutineType2(path string) (map[time.Duration][]string, error) {
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}

	bf := bytes.Buffer{}

	save := func(s string) {
		bf.WriteString(s + "\n")
	}
	reset := func() {
		bf.Reset()
	}

    private final ThreadLocal<Path> fileThreadLocal = new ThreadLocal<>();

    Path createFile() throws IOException {
      Path file = java.nio.file.Files.createTempFile("SinkSourceFile", "txt");
      fileThreadLocal.set(file);
      return file;
    }

    Path getPath() {
      return fileThreadLocal.get();
    }

```

...eso es porque el generador del cliente usa el **operation ID** interno de OpenAPI para cada *path operation*.

OpenAPI requiere que cada operation ID sea único a través de todas las *path operations*, por lo que FastAPI usa el **nombre de la función**, el **path**, y el **método/operación HTTP** para generar ese operation ID, porque de esa manera puede asegurarse de que los operation IDs sean únicos.