Interceptors can be chained. Suppose you have both a compressing interceptor and a checksumming interceptor: you'll need to decide whether data is compressed and then checksummed, or checksummed and then compressed. OkHttp uses lists to track interceptors, and interceptors are called in order.

![Interceptors Diagram](../assets/images/******@****.***)

 *  <tr>
 *      <td>goal</td>
 *      <td>name = "&lt;goal-name&gt;"</td>
 *      <td>Yes</td>
 *      <td>The name for the Mojo that users will reference from the command line to execute the Mojo directly,
 *      or inside a POM in order to provide Mojo-specific configuration.</td>
 *  </tr>
 *  <tr>
 *      <td>implementation</td>
 *      <td>none (detected)</td>
 *      <td>Yes</td>

The dictionary in `openapi_extra` will be deeply merged with the automatically generated OpenAPI schema for the *path operation*.

So, you could add additional data to the automatically generated schema.

For example, you could decide to read and validate the request with your own code, without using the automatic features of FastAPI with Pydantic, but you could still want to define the request in the OpenAPI schema.

You could do that with `openapi_extra`:

```

</div>

/// note

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.

It is equivalent to:

```Python
from main import app
```

///

Create metadata for your tags and pass it to the `openapi_tags` parameter:

{* ../../docs_src/metadata/tutorial004_py39.py hl[3:16,18] *}

Notice that you can use Markdown inside of the descriptions, for example "login" will be shown in bold (**login**) and "fancy" will be shown in italics (_fancy_).

/// tip

You don't have to add metadata for all the tags that you use.

///

	for _, collectorPath := range h.metricsData.collectorPaths {
		if collectorPath.isDescendantOf(path) {
			gatherer := h.metricsData.mgGatherers[collectorPath]

			// For Bucket metrics we need to set the buckets argument inside the
			// metric group, so that it will affect collection. If no buckets
			// are provided, we will not return bucket metrics.
			if bmg, ok := h.metricsData.bucketMGMap[collectorPath]; ok {
				if len(buckets) == 0 {

   * listeners are also applicable to heavyweight functions passed to this method. (Specifically,
   * {@code directExecutor} functions should avoid heavyweight operations inside {@code
   * AsyncFunction.apply}. Any heavyweight operations should occur in other threads responsible for
   * completing the returned {@code Future}.)
   *

Au final, peu importe le cas parmi ceux ci-dessus, **FastAPI** fonctionnera de manière asynchrone et sera extrêmement rapide.

Mais si vous suivez bien les instructions ci-dessus, alors **FastAPI** pourra effectuer quelques optimisations et ainsi améliorer les performances.

## Détails techniques

     * represents or the drive on which the directory or file resides. Objects
     * other than <code>TYPE_SHARE</code> or <code>TYPE_FILESYSTEM</code> will result
     * in 0L being returned.
     *
     * @return the free disk space in bytes of the drive on which this file or
     *         directory resides
     * @throws CIFSException if an error occurs accessing the resource
     */

             * parameter words. besides, win98 doesn't return "OptionalSupport" field
             */

            if (wordCount > 2) {
                readParameterWordsWireFormat(buffer, bufferIndex + 4);

                /* The SMB_COM_NT_CREATE_ANDX response wordCount is wrong. There's an
                 * extra 16 bytes for some "Offline Files (CSC or Client Side Caching)"