throw new IllegalStateException("More than one source open");
            }
            return new FilterReader(source.openStream()) {
              @Override
              public void close() throws IOException {
                super.close();
                counter[0]--;
              }
            };
          }
        };
    Reader joinedReader = CharSource.concat(reader, reader, reader).openStream();

import com.google.common.annotations.J2ktIncompatible;
import java.io.Serializable;
import java.util.Iterator;

/** An ordering that uses the reverse of the natural order of the values. */
@GwtCompatible
final class ReverseNaturalOrdering extends Ordering<Comparable<?>> implements Serializable {
  static final ReverseNaturalOrdering INSTANCE = new ReverseNaturalOrdering();

  @Override

/**
 * An implementation of ImmutableMultiset backed by a JDK Map and a list of entries. Used to protect
 * against hash flooding attacks.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class JdkBackedImmutableMultiset<E> extends ImmutableMultiset<E> {
  private final Map<E, Integer> delegateMap;
  private final ImmutableList<Entry<E>> entries;
  private final long size;

## 自定义头部

请注意，可以使用'X-'前缀添加自定义专有头部。

{* ../../docs_src/query_param_models/tutorial001_an_py310.py hl[9:13,17] *}

**FastAPI** 将会从请求的**查询参数**中**提取**出**每个字段**的数据，并将其提供给你定义的 Pydantic 模型。

## 查看文档

你可以在 `/docs` 页面的 UI 中查看查询参数：

<div class="screenshot">
<img src="/img/tutorial/query-param-models/image01.png">
</div>

## 禁止额外的查询参数

在一些特殊的使用场景中（可能不是很常见），你可能希望**限制**你要接收的查询参数。

你可以使用 Pydantic 的模型配置来 `forbid`（意为禁止 —— 译者注）任何 `extra`（意为额外的 —— 译者注）字段：

package gradlebuild.docs

import org.w3c.dom.*
import org.xml.sax.InputSource
import spock.lang.Specification

import javax.xml.parsers.DocumentBuilder
import javax.xml.parsers.DocumentBuilderFactory

abstract class XmlSpecification extends Specification {
    final Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()

    def parse(String str, Document document = null) {

bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here....

bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here....

bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## ## Storage class of PV to bind. By default it looks for standard storage class. ## If the PV uses a different storage class, specify that here....

    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 2, 6));
  }

  /**
   * A simple immutable data class to encapsulate the information to be found in a Teredo address.
   *
   * <p>All of the fields in this class are encoded in various portions of the IPv6 address as part
   * of the protocol. More protocols details can be found at: <a target="_parent"