import java.util.Spliterator;
import java.util.Spliterators;
import java.util.Spliterators.AbstractSpliterator;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.DoubleConsumer;
import java.util.function.IntConsumer;
import java.util.function.LongConsumer;
import java.util.stream.BaseStream;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;

///

### Étape 4 : définir la **fonction de chemin**.

Voici notre "**fonction de chemin**" (ou fonction d'opération de chemin) :

* **chemin** : `/`.
* **opération** : `get`.
* **fonction** : la fonction sous le "décorateur" (sous `@app.get("/")`).

{* ../../docs_src/first_steps/tutorial001.py hl[7] *}

C'est une fonction Python.

    // you should remove the 'final' if you need to override this
    /**
     * Hook method called before action execution.
     * This method refreshes the user information if a user is logged in
     * and delegates to the view helper's action hook.
     *
     * @param runtime the action runtime context
     * @return the action response, or null to continue with normal processing
     */
    @Override

### Custom Generate Unique ID Function { #custom-generate-unique-id-function }

FastAPI uses a **unique ID** for each *path operation*, which is used for the **operation ID** and also for the names of any needed custom models, for requests or responses.

You can customize that function. It takes an `APIRoute` and outputs a string.

* the path operation decorator
* the path operation function

* the body
* the request body
* the response body
* the JSON body
* the form body
* the file body
* the function body

* the parameter
* the body parameter
* the path parameter
* the query parameter
* the cookie parameter
* the header parameter
* the form parameter
* the function parameter

* the event
* the startup event

type currentPathTracker struct {
	name *unsafe.Pointer // contains atomically accessed *string
}

// currentPathUpdater provides a lightweight update function for keeping track of
// current objects for each disk.
// Returns a function that can be used to update the current object
// and a function to call to when processing finished.
func (p *scannerMetrics) currentPathUpdater(disk, initial string) (update func(path string), done func()) {

///

## Create a middleware { #create-a-middleware }

To create a middleware you use the decorator `@app.middleware("http")` on top of a function.

The middleware function receives:

* The `request`.
* A function `call_next` that will receive the `request` as a parameter.

import org.opensearch.action.fieldcaps.FieldCapabilitiesResponse;
import org.opensearch.action.get.GetRequest;
import org.opensearch.action.get.GetRequestBuilder;
import org.opensearch.action.get.GetResponse;
import org.opensearch.action.get.MultiGetRequest;
import org.opensearch.action.get.MultiGetRequestBuilder;
import org.opensearch.action.get.MultiGetResponse;
import org.opensearch.action.index.IndexRequest;

import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.DocWriteResponse.Result;
import org.opensearch.action.admin.indices.refresh.RefreshResponse;
import org.opensearch.action.bulk.BulkItemResponse;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.bulk.BulkResponse;
import org.opensearch.action.delete.DeleteRequestBuilder;
import org.opensearch.action.delete.DeleteResponse;

        </ul>
        <script>
        var ws = null;
            function connect(event) {
                var itemId = document.getElementById("itemId")
                var token = document.getElementById("token")
                ws = new WebSocket("ws://localhost:8000/items/" + itemId.value + "/ws?token=" + token.value);
                ws.onmessage = function(event) {
                    var messages = document.getElementById('messages')