* Specific HTTP headers or all of them with the wildcard `"*"`.

{* ../../docs_src/cors/tutorial001_py39.py hl[2,6:11,13:19] *}


The default parameters used by the `CORSMiddleware` implementation are restrictive by default, so you'll need to explicitly enable particular origins, methods, or headers, in order for browsers to be permitted to use them in a Cross-Domain context.

The following arguments are supported:

from fastapi import FastAPI, File, UploadFile

app = FastAPI()


@app.post("/files/")
async def create_file(file: bytes | None = File(default=None)):
    if not file:
        return {"message": "No file sent"}
    else:
        return {"file_size": len(file)}


@app.post("/uploadfile/")
async def create_upload_file(file: UploadFile | None = None):
    if not file:
        return {"message": "No upload file sent"}
    else:

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: str | None = Query(default=None, max_length=50)):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

     * @param session the session to use
     * @param artifactCoordinates t
     * @return the version range resolution result
     * @throws VersionResolverException if an errors occurs
     */
    @Nonnull
    default VersionRangeResolverResult resolve(
            @Nonnull Session session, @Nonnull ArtifactCoordinates artifactCoordinates)
            throws VersionResolverException {

import jakarta.annotation.Resource;

/**
 * Admin action for Stopwords management.
 *
 */
public class AdminDictStopwordsAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminDictStopwordsAction() {
        super();
    }

    /** The role for this action. */
    public static final String ROLE = "admin-dict";

     * If not set, {@link System#in} will be used by default.
     *
     * @return the input stream, or null if not set
     */
    @Nullable
    InputStream stdIn();

    /**
     * Returns the output stream to be used for the Maven execution.
     * If not set, {@link System#out} will be used by default.
     *
     * @return the output stream, or null if not set
     */

from fastapi import FastAPI, Path, Query

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    item_id: int = Path(title="The ID of the item to get"),
    q: Union[str, None] = Query(default=None, alias="item-query"),
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})

    }

    /**
     * Gets a typed value from a document map with a default value.
     *
     * @param <T> the type to convert the value to
     * @param doc the document map to extract the value from
     * @param key the key to look up in the document map
     * @param clazz the class type to convert the value to
     * @param defaultValue the default value to return if the key is not found or conversion fails

 * parameters.
 *
 * @author mike nonemacher
 */
@NullUnmarked
class CacheBuilderFactory {
  // Default values contain only 'null', which means don't call the CacheBuilder method (just give
  // the CacheBuilder default).
  private Set<Integer> concurrencyLevels = Sets.newHashSet((Integer) null);
  private Set<Integer> initialCapacities = Sets.newHashSet((Integer) null);

 * This action displays error pages when unhandled exceptions occur
 * during search operations or page navigation.
 */
public class ErrorAction extends FessSearchAction {

    /**
     * Default constructor for ErrorAction.
     */
    public ErrorAction() {
        super();
    }

    // ===================================================================================