* instances.
 *
 * <p><b>Warning:</b> The comparators or comparables used must be <i>consistent with equals</i> as
 * explained by the {@link Comparable} class specification. Otherwise, the resulting multiset will
 * violate the general contract of {@link SetMultimap}, which is specified in terms of {@link
 * Object#equals}.
 *

import java.io.Serializable;
import java.util.concurrent.atomic.AtomicLongArray;

/**
 * A {@code double} array in which elements may be updated atomically. See the {@link
 * java.util.concurrent.atomic} package specification for description of the properties of atomic
 * variables.
 *
 * <p><a id="bitEquals"></a>This class compares primitive {@code double} values in methods such as

And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

But let's save you the time of reading the full long specification just to find those little pieces of information you need.

Let's use the tools provided by **FastAPI** to handle security.

## How it looks { #how-it-looks }

## 2. Protocol Specification Reference

- **MS-SMBD**: SMB2 Remote Direct Memory Access (RDMA) Transport Protocol
- **MS-SMB2 Section 2.2.3.1.1**: SMB2 Negotiate Protocol Request with RDMA
- **MS-SMB2 Section 3.1.5.2**: RDMA Transport Connection
- **RFC 5040**: A Remote Direct Memory Access Protocol Specification
- **RFC 5041**: Direct Data Placement over Reliable Transports

 *   generally: {@code 1.0.X2 < 1.0-X3 < 1.0.1} for any string {@code X}; but prefer {@code 1.0.0-X1}
 *   over {@code 1.0.0.X1}.</li>
 * </ul>
 *
 * @see <a href="https://maven.apache.org/pom.html#version-order-specification">"Versioning" in the POM reference</a>
 */
public class ComparableVersion implements Comparable<ComparableVersion> {
    private static final int MAX_INTITEM_LENGTH = 9;

    def make_not_authenticated_error(self) -> HTTPException:
        """
        The WWW-Authenticate header is not standardized for API Key authentication but
        the HTTP specification requires that an error of 401 "Unauthorized" must
        include a WWW-Authenticate header.

        Ref: https://datatracker.ietf.org/doc/html/rfc9110#name-401-unauthorized

경로 매개변수가 정수형으로 선언된 것을 확인할 수 있습니다.

///

## 표준 기반의 이점, 대체 문서 { #standards-based-benefits-alternative-documentation }

그리고 생성된 스키마는 [OpenAPI](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md) 표준에서 나온 것이기 때문에 호환되는 도구가 많이 있습니다.

이 덕분에 **FastAPI** 자체에서 [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc)로 접속할 수 있는 (ReDoc을 사용하는) 대체 API 문서를 제공합니다:

   *
   * <p><b>Warning:</b> when this method is used, the resulting map will use identity ({@code ==})
   * comparison to determine equality of keys, which is a technical violation of the {@link Map}
   * specification, and may not be what you expect.
   *
   * @throws IllegalStateException if the key strength was already set
   * @see WeakReference
   */
  @CanIgnoreReturnValue
  @GwtIncompatible // java.lang.ref.WeakReference

     * @return the hash algorithm
     */
    public int getSelectedHashAlgorithm() {
        return selectedHashAlgorithm;
    }

    /**
     * Calculates hash according to SMB 3.1.1 preauth integrity specification.
     *
     * @param previousHash the previous hash in the chain
     * @param messageData the message data to hash
     * @param hashAlgorithm the hash algorithm to use
     * @return the new hash

还是使用 Python 类型声明，**FastAPI** 提供了（集成 Swagger UI 的）自动交互式文档。

注意，路径参数的类型是整数。

///

## 基于标准的好处，备选文档 { #standards-based-benefits-alternative-documentation }

**FastAPI** 使用 [OpenAPI](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md) 生成概图，所以能兼容很多工具。

因此，**FastAPI** 还内置了 ReDoc 生成的备选 API 文档，可在此查看 [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc)：

<img src="/img/tutorial/path-params/image02.png">