{* ../../docs_src/header_param_models/tutorial001_an_py310.py hl[9:14,18] *}

**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can see the required headers in the docs UI at `/docs`:

<div class="screenshot">

     */
    @Override
    public ResponseData doGet(final String uri) {
        return processRequest(uri, true);
    }

    /**
     * Processes an SMB request for the given URI.
     *
     * @param uri the URI to process
     * @param includeContent whether to include content in the response
     * @return the response data
     */

        if (requestHeaders.name(i) == Header.TARGET_PATH_UTF8) {
          path = requestHeaders.value(i)
          break
        }
        i++
      }
      if (path == null) {
        // TODO: send bad request error
        throw AssertionError()
      }
      val file = File(baseDirectory.toString() + path)
      if (file.isDirectory) {
        serveDirectory(stream, file.listFiles()!!)
      } else if (file.exists()) {

`CORSMiddleware` отвечает на два типа HTTP-запросов...

### CORS-запросы с предварительной проверкой

Это любые `OPTIONS` запросы с заголовками `Origin` и `Access-Control-Request-Method`.

В этом случае middleware перехватит входящий запрос и отправит соответствующие CORS-заголовки в ответе, а также ответ `200` или `400` в информационных целях.

### Простые запросы

				"application/rtf",
				"application/rtx",
				"application/samlassertion+xml",
				"application/samlmetadata+xml",
				"application/sbml+xml",
				"application/scvp-cv-request",
				"application/scvp-cv-response",
				"application/scvp-vp-request",
				"application/scvp-vp-response",
				"application/sdp",
				"application/set-payment",
				"application/set-payment-initiation",
				"application/set-registration",

 */
package org.codelibs.fess.app.web.api.admin.plugin;

import org.lastaflute.web.validation.Required;

import jakarta.validation.constraints.Size;

/**
 * Request body for plugin installation API.
 * This class represents the data structure for installing a plugin
 * through the admin REST API.
 */
public class InstallBody {

    // ===================================================================================
    //                                                                   Request Parameter
    //                                                                   =================
    public SearchRequestParams request() {
        return _searchRequestParams;
    }

    public void setPreference(final String preference) {
        _preference = preference;

* **Editor support**.
* **Type checks**.

...and **FastAPI** uses the same declarations to:

* **Define requirements**: from request path parameters, query parameters, headers, bodies, dependencies, etc.
* **Convert data**: from the request to the required type.
* **Validate data**: coming from each request:
    * Generating **automatic errors** returned to the client when the data is invalid.
* **Document** the API using OpenAPI:

		handlerFlags |= flag
	}

	// Get name of the handler using reflection.
	handlerName := getHandlerName(f, "adminAPIHandlers")

	var handler http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
		// Update request context with `logger.ReqInfo`.
		r = r.WithContext(newContext(r, w, handlerName))

		defer logger.AuditLog(r.Context(), w, r, mustGetClaimsFromToken(r))

			</h2>
			<div class="errormessage"><la:message key="labels.bad_request" /></div>
		</div>
	</main>
	<jsp:include page="../footer.jsp" />
	<input type="hidden" id="contextPath" value="${pageContext.request.contextPath}" />
	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/clipboard.min.js')}"></script>