## Import `Field` { #import-field }

First, you have to import it:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}


/// warning

Notice that `Field` is imported directly from `pydantic`, not from `fastapi` as are all the rest (`Query`, `Path`, `Body`, etc).

///

## Declare model attributes { #declare-model-attributes }

    replaceWith =
      ReplaceWith(
        expression = "callFactory.asEventSourceFactory()",
        imports = ["okhttp3.sse.EventSource.Factory.Companion.asEventSourceFactory"],
      ),
    level = DeprecationLevel.WARNING,
  )
  @JvmStatic
  fun createFactory(callFactory: Call.Factory): EventSource.Factory = callFactory.asEventSourceFactory()

  @Deprecated(
    message = "Moved to extension function.",
    replaceWith =

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.lang.Math.min;
import static java.util.logging.Level.WARNING;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.VisibleForTesting;
import java.util.logging.Logger;
import org.jspecify.annotations.Nullable;

/**

    }

    /**
     * Test that getPassword() is deprecated and logs warning
     */
    @Test
    @DisplayName("Test deprecated getPassword() method warning")
    public void testDeprecatedGetPasswordWarning() {
        NtlmPasswordAuthenticator auth = new NtlmPasswordAuthenticator("user", "TestPass123!");

        // This should log a warning about using deprecated method
        String password = auth.getPassword();

If for some reason you need to disable automatic conversion of underscores to hyphens, set the parameter `convert_underscores` of `Header` to `False`:

{* ../../docs_src/header_params/tutorial002_an_py310.py hl[10] *}

/// warning

Before setting `convert_underscores` to `False`, bear in mind that some HTTP proxies and servers disallow the usage of headers with underscores.

///

## Duplicate headers { #duplicate-headers }

The files and form fields will be uploaded as form data and you will receive the files and form fields.

And you can declare some of the files as `bytes` and some as `UploadFile`.

/// warning

{* ../../docs_src/body_updates/tutorial001_py310.py hl[28:33] *}

`PUT` is used to receive data that should replace the existing data.

### Warning about replacing { #warning-about-replacing }

That means that if you want to update the item `bar` using `PUT` with a body containing:

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

    }

    /**
     * Event severity levels
     */
    public enum Severity {
        INFO(0), WARNING(1), ERROR(2), CRITICAL(3);

        private final int level;

        Severity(int level) {
            this.level = level;
        }

        public int getLevel() {
            return level;

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"runtime"
	"testing"
	"time"
)

// WARNING:
//
// Expected source line number is hard coded, 35, in the
// following test. Adding new code before this test or changing its
// position will cause the line number to change and the test to FAIL
// Tests getSource().

# Path Operation Configuration { #path-operation-configuration }

There are several parameters that you can pass to your *path operation decorator* to configure it.

/// warning

Notice that these parameters are passed directly to the *path operation decorator*, not to your *path operation function*.

///

## Response Status Code { #response-status-code }

You can define the (HTTP) `status_code` to be used in the response of your *path operation*.