As part of the application object creation, a *path operation* for `/openapi.json` (or for whatever you set your `openapi_url`) is registered.

It just returns a JSON response with the result of the application's `.openapi()` method.

By default, what the method `.openapi()` does is check the property `.openapi_schema` to see if it has contents and return them.

    private static final Hashtable TAB = new Hashtable();
    private static long lastModified = 1L;
    private static int alt;
    private static LogStream log = LogStream.getInstance();

    /**
     * This is really just for {@link jcifs.smb1.UniAddress}. It does
     * not throw an {@link java.net.UnknownHostException} because this
     * is queried frequently and exceptions would be rather costly to
     * throw on a regular basis here.
     */

///

If you are using `pip` to install packages (it comes by default with Python), you should **upgrade** it to the latest version.

Many exotic errors while installing a package are solved by just upgrading `pip` first.

/// tip

You would normally do this **once**, right after you create the virtual environment.

///

Make sure the virtual environment is active (with the command above) and then run:

- **Removing a site** is not allowed from a set of replicated sites once configured.
- All sites must be using the **same** external IDP(s) if any.

    raise HTTPException(status_code=204)


@app.get("/http-no-body-statuscode-with-detail-exception")
async def no_body_status_code_with_detail_exception():
    raise HTTPException(status_code=204, detail="I should just disappear!")


@app.get("/starlette-items/{item_id}")
async def read_starlette_item(item_id: str):
    if item_id not in items:
        raise StarletteHTTPException(status_code=404, detail="Item not found")

package configdump

import (
	"encoding/json"
	"fmt"
	"math/big"
	"strings"
	"text/tabwriter"
	"time"

	"sigs.k8s.io/yaml"

	"istio.io/istio/pkg/log"
)

// PrintSecretDump prints just the secret config dump to the ConfigWriter stdout
func (c *ConfigWriter) PrintSecretDump(outputFormat string) error {
	if c.ztunnelDump == nil {
		return fmt.Errorf("config writer has not been primed")
	}

import java.util.Queue;
import javax.annotation.CheckForNull;

/**
 * A class for reading lines of text. Provides the same functionality as {@link
 * java.io.BufferedReader#readLine()} but for all {@link Readable} objects, not just instances of
 * {@link Reader}.
 *
 * @author Chris Nokleberg
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class LineReader {

    know that that it is application specific, it's not part of the specification.
    """

    def __init__(
        self,
        *,
        grant_type: Annotated[
            Union[str, None],
            Form(pattern="password"),
            Doc(
                """
                The OAuth2 spec says it is required and MUST be the fixed string

/// note | "Technical Details"

You could also use `from starlette.middleware.cors import CORSMiddleware`.

**FastAPI** provides several middlewares in `fastapi.middleware` just as a convenience for you, the developer. But most of the available middlewares come directly from Starlette.

<img src="/img/tutorial/path-params/image01.png">

/// check

Again, just with that same Python type declaration, **FastAPI** gives you automatic, interactive documentation (integrating Swagger UI).

Notice that the path parameter is declared to be an integer.

///