### Install `pydantic-settings`

First, make sure you create your [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then install the `pydantic-settings` package:

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

            return redirect(ErrorAction.class);
        }
        final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
        if (url == null) {
            saveError(messages -> messages.addErrorsDocumentNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);
        }

        if (fessConfig.isSearchLog()) {

from typing import Annotated, Union

from fastapi import FastAPI, Header
from pydantic import BaseModel

app = FastAPI()


class CommonHeaders(BaseModel):
    model_config = {"extra": "forbid"}

    host: str
    save_data: bool
    if_modified_since: Union[str, None] = None
    traceparent: Union[str, None] = None
    x_tag: list[str] = []


@app.get("/items/")

package jcifs.smb1.dcerpc.msrpc;

import jcifs.smb1.dcerpc.*;
import jcifs.smb1.dcerpc.ndr.*;
import jcifs.smb1.util.Hexdump;

public class srvsvc {

    public static String getSyntax() {
        return "4b324fc8-1670-01d3-1278-5a47bf6ee188:3.0";
    }

    public static class ShareInfo0 extends NdrObject {

        public String netname;

        public void encode(NdrBuffer _dst) throws NdrException {
            _dst.align(4);

import static org.codelibs.core.collection.ArrayUtil.asArray;

/**
 * プロパティの値の設定に失敗したときにスローされる例外です。
 *
 * @author higa
 *
 */
public class IllegalPropertyRuntimeException extends ClRuntimeException {

    private static final long serialVersionUID = 3584516316082904020L;

    private final Class<?> targetClass;

    private final String propertyName;

    /**
     * {@link IllegalPropertyRuntimeException}を作成します。
     *

import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.ResourceUtil;

import jakarta.annotation.PostConstruct;

public class CurlHelper {
    private static final Logger logger = LogManager.getLogger(CurlHelper.class);

    private SSLSocketFactory sslSocketFactory;

    private NodeManager nodeManager;

    @PostConstruct
    public void init() {

import okhttp3.RequestBody
import okio.Buffer

class MainTest {
  @Test
  fun simple() {
    val request = fromArgs("http://example.com").createRequest()
    assertThat(request.method).isEqualTo("GET")
    assertThat(request.url.toString()).isEqualTo("http://example.com/")
    assertThat(request.body).isNull()
  }

  @Test
  @Throws(IOException::class)
  fun put() {

import org.codelibs.opensearch.runner.net.OpenSearchCurl;
import org.dbflute.optional.OptionalEntity;

import jakarta.annotation.PostConstruct;

public class DictionaryManager {
    private static final Logger logger = LogManager.getLogger(DictionaryManager.class);

    protected List<DictionaryCreator> creatorList = new ArrayList<>();

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {

import org.dbflute.cbean.ConditionQuery;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.index.query.QueryBuilder;

/**
 * @author ESFlute (using FreeGen)
 */
public class BsScheduledJobCB extends EsAbstractConditionBean {

    // ===================================================================================
    //                                                                           Attribute

import org.dbflute.cbean.ConditionQuery;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.index.query.QueryBuilder;

/**
 * @author ESFlute (using FreeGen)
 */
public class BsWebAuthenticationCB extends EsAbstractConditionBean {

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