eventData, eErr := target.store.Get(key)
	if eErr != nil {
		// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
		// Such events will not exist and would've been already been sent successfully.
		if os.IsNotExist(eErr) {
			return nil
		}
		return eErr
	}

	if err := target.send(eventData); err != nil {
		if xnet.IsConnRefusedErr(err) {
			return store.ErrNotConnected

        }

        try {
          response = realChain.proceed(request)
          newRoutePlanner = true
        } catch (e: IOException) {
          // An attempt to communicate with a server failed. The request may have been sent.
          if (!recover(e, call, request, requestSendStarted = e !is ConnectionShutdownException)) {
            throw e.withSuppressed(recoveredFailures)
          } else {
            recoveredFailures += e
          }

  private var waitingCoordinatorTask: SerialTask? = null
  private var waitingCoordinatorInterrupted = false
  private var waitingCoordinatorNotified = false

  /** How many times a new task has been started. Guarded by [TaskRunner.lock]. */
  private var contextSwitchCount = 0

  /** Guarded by [TaskRunner.lock]. */
  private var activeThreads = 0

        "The specified domain did not exist.", "The directory name is invalid.", "Access is denied.",
        "The format of the specified computer name is invalid.", "The pipe has been ended.", "The specified local group does not exist.",
        "Logon failure: the user has not been granted the requested logon type at this computer.",
        "The SAM database on the Windows NT Server does not have a computer account for this workstation trust relationship.",

///

```Python hl_lines="11"
{!> ../../docs_src/path_params_numeric_validations/tutorial006.py!}
```

////

## Recap

With `Query`, `Path` (and others you haven't seen yet) you can declare metadata and string validations in the same ways as with [Query Parameters and String Validations](query-params-str-validations.md){.internal-link target=_blank}.

And you can also declare numeric validations:

	selectAST *Select

	// Analysis result of the statement
	selectQProp qProp

	// Result of parsing the limit clause if one is present
	// (otherwise -1)
	limitValue int64

	// Count of rows that have been output.
	outputCount int64

	// Table alias
	tableAlias string
}

// ParseSelectStatement - parses a select query from the given string
// and analyzes it.

import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.Writer;

/**
 * Unit test for {@link AppendableWriter}.
 *
 * @author Alan Green
 */
public class AppendableWriterTest extends IoTestCase {

  /** Helper class for testing behavior with Flushable and Closeable targets. */
  private static class SpyAppendable implements Appendable, Flushable, Closeable {

Um dies zu erreichen, importieren Sie `JSONResponse`, und geben Sie Ihren Inhalt direkt zurück, indem Sie den gewünschten `status_code` setzen:

//// tab | Python 3.10+

```Python hl_lines="4  25"
{!> ../../docs_src/additional_status_codes/tutorial001_an_py310.py!}
```

////

# Using the Request Directly

Up to now, you have been declaring the parts of the request that you need with their types.

Taking data from:

* The path as parameters.
* Headers.
* Cookies.
* etc.

And by doing so, **FastAPI** is validating that data, converting it and generating documentation for your API automatically.

But there are situations where you might need to access the `Request` object directly.

Then you could disable OpenAPI (including the UI docs) by setting the environment variable `OPENAPI_URL` to the empty string, like:

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Then if you go to the URLs at `/openapi.json`, `/docs`, or `/redoc` you will just get a `404 Not Found` error like: