/// tip | Tipp

Der eigentliche Callback ist nur ein HTTP-Request.

Wenn Sie den Callback selbst implementieren, können Sie beispielsweise <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a> oder <a href="https://requests.readthedocs.io/" class="external-link" target="_blank">Requests</a> verwenden.

///

## Schreiben des Codes, der den Callback dokumentiert

Die gleichen Modelle werden von den Requests gemeinsam genutzt, es handelt sich also nicht um ein Modell pro Request, pro Benutzer, oder ähnliches.

Stellen wir uns vor, dass das Laden des Modells **eine ganze Weile dauern** kann, da viele **Daten von der Festplatte** gelesen werden müssen. Sie möchten das also nicht für jeden Request tun.

# Set to true to add reviewers to pull requests
addReviewers: false

# Set to true to add assignees to pull requests
addAssignees: author

# A number of assignees to add to the pull request
# Set to 0 to add all of the assignees.
# Uses numberOfReviewers if unset.

  // Optional: confirm that your app made the HTTP requests you were expecting.
  RecordedRequest request1 = server.takeRequest();
  assertEquals("/v1/chat/messages/", request1.getUrl().encodedPath());
  assertNotNull(request1.getHeaders().get("Authorization"));

  RecordedRequest request2 = server.takeRequest();
  assertEquals("/v1/chat/messages/2", request2.getUrl().encodedPath());

  RecordedRequest request3 = server.takeRequest();

    /**
     * Map of pending requests to their corresponding responses.
     */
    protected HashMap response_map = new HashMap(4);

    /**
     * Creates a key for the specified request for response matching.
     *
     * @param request the request to create a key for
     * @throws IOException if an I/O error occurs
     */
    protected abstract void makeKey(Request request) throws IOException;

    /**

 * that controls the interval between requests to the same host.
 * It uses a ConcurrentMap to store the last access time for each host.
 * The delayBeforeProcessing method is overridden to introduce a delay before processing a URL,
 * ensuring that requests to the same host are not made too frequently.

/// note | Detalhes Técnicos

Você também pode utilizar `from starlette.requests import Request`.

O **FastAPI** fornece isso diretamente apenas como uma conveniência para você, o desenvolvedor. Mas ele vem diretamente do Starlette.

     *
     * @param request The original HTTP servlet request
     * @param servletPath The custom servlet path for this web API request
     */
    public WebApiRequest(final HttpServletRequest request, final String servletPath) {
        super(request);
        this.servletPath = servletPath;
    }

    /**
     * Gets the servlet path for this request.

   * the URL's host name. Note that concurrent requests to a single IP address may still exceed this
   * limit: multiple hostnames may share an IP address or be routed through the same HTTP proxy.
   *
   * If more than [maxRequestsPerHost] requests are in flight when this is invoked, those requests
   * will remain in flight.
   *
   * WebSocket connections to hosts **do not** count against this limit.
   */
  @get:Synchronized

///

## `HTTPSRedirectMiddleware`

Erzwingt, dass alle eingehenden Requests entweder `https` oder `wss` sein müssen.

Alle eingehenden Requests an `http` oder `ws` werden stattdessen an das sichere Schema umgeleitet.

{* ../../docs_src/advanced_middleware/tutorial001.py hl[2,6] *}

## `TrustedHostMiddleware`