{* ../../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">

 * artifact.
 *
 */
@Deprecated
public interface ArtifactMetadataSource {

    ResolutionGroup retrieve(MetadataResolutionRequest request) throws ArtifactMetadataRetrievalException;

    ResolutionGroup retrieve(
            Artifact artifact, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories)

type ReadMultipleResp struct {
	Bucket  string    `msg:"bk"`           // Bucket as given by request.
	Prefix  string    `msg:"pr,omitempty"` // Prefix as given by request.
	File    string    `msg:"fl"`           // File name as given in request.
	Exists  bool      `msg:"ex"`           // Returns whether the file existed on disk.

Wenn beim Erstellen von Web-APIs mit FastAPI ein Fehler in unserem Code auftritt, wird FastAPI ihn normalerweise dem einzelnen <abbr title="Request – Anfrage: Daten, die der Client zum Server sendet">Request</abbr> zurückgeben, der den Fehler ausgelöst hat. 🛡

Der Client erhält für diesen Request einen **500 Internal Server Error**, aber die Anwendung arbeitet bei den nächsten Requests weiter, anstatt einfach komplett abzustürzen.

// Currently these keys are:
//   - X-Amz-Server-Side-Encryption-Customer-Key
//   - X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key
func (api objectAPIHandlers) NewMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "NewMultipartUpload")

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

	objectAPI := api.ObjectAPI()
	if objectAPI == nil {

 * account names using the LSA RPC interface.
 */
public class MsrpcLookupSids extends lsarpc.LsarLookupSids {

    SID[] sids;

    /**
     * Creates a new request to lookup SIDs.
     *
     * @param policyHandle the LSA policy handle
     * @param sids the array of SIDs to lookup
     */
    public MsrpcLookupSids(final LsaPolicyHandle policyHandle, final SID[] sids) {

@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class ListMultimapPutAllTester<K, V> extends AbstractListMultimapTester<K, V> {
  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAllAddsAtEndInOrder() {
    List<V> values = asList(v3(), v1(), v4());

    for (K k : sampleKeys()) {
      resetContainer();

     */
    @Size(max = 10000)
    @Required
    public String rt;

    /**
     * Hash value for security or validation purposes.
     * This field is optional and used for request verification.
     */
    public String hash;

    /**
     * Query identifier associated with the search that led to this document access.
     * This is required for tracking and analytics purposes.
     */

 */
public class SmbComRename extends ServerMessageBlock {

    private final int searchAttributes;
    private final String oldFileName;
    private final String newFileName;

    /**
     * Constructs a rename request.
     *
     * @param config the configuration
     * @param oldFileName the current file name
     * @param newFileName the new file name
     */

                                    </div>
                                </div>
                                <c:set var="pager" value="${accessTokenPager}"
                                       scope="request"/>
                                <c:import url="/WEB-INF/view/common/admin/crud/pagination.jsp"/>
                                <c:if test="${pager.currentPageNumber > pager.allPageCount}">