例如,您为用户/9运行一个GET请求,但没有id为#9的用户。 哪个是最佳响应码?

200好了 202年接受 204无内容 400错误请求 404未找到


当前回答

正如许多人所说的,404会误导客户端,如果请求uri不存在,或者请求的uri不能获取请求的资源,它不允许客户端进行区分。

200状态被期望包含资源数据——所以它不是正确的选择。 204状态意味着完全不同的东西,不应该用作GET请求的响应。

由于这样或那样的原因,所有其他现有状态都不适用。

我看到这个话题在很多地方被反复讨论。对我来说,很明显,要消除围绕这个话题的困惑,就需要一个专门的成功状态。比如“209 -没有资源显示”。

这将是一个2xx状态,因为找不到ID不应该被认为是客户端错误(如果客户端知道服务器DB中的所有内容,它们就不需要向服务器询问任何事情,不是吗?)这个专用状态将解决所有与使用其他状态争论的问题。

唯一的问题是:我如何让RFC接受这个标准?

其他回答

我不认为404是正确的回应。

如果使用404,如何知道是没有找到api,还是数据库中的记录没有找到?

从你的描述,我会使用200 OK,因为你的api执行所有逻辑没有任何问题。只是在数据库中找不到记录。所以,这不是API问题,也不是数据库问题,这是你的问题,你认为记录存在,但它不存在。因此,API执行成功,数据库查询执行成功,但没有发现任何返回。

因此,在这种情况下,我会用

200好了

使用空响应,如数组的[]或对象的{}。

在以前的项目中,我使用了404。如果没有用户9,则没有找到对象。因此404 Not Found是合适的。

如果对象存在,但没有数据,则为204 no Content。我认为在你的例子中,这个物体并不存在。

根据RFC7231 -第59页(https://www.rfc-editor.org/rfc/rfc7231#page-59) 404状态码响应的定义是:

6.5.4. 404 Not Found The 404 (Not Found) status code indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists. A 404 status code does not indicate whether this lack of representation is temporary or permanent; the 410 (Gone) status code is preferred over 404 if the origin server knows, presumably through some configurable means, that the condition is likely to be permanent. A 404 response is cacheable by default; i.e., unless otherwise indicated by the method definition or explicit cache controls (see Section 4.2.2 of [RFC7234]).

而引起质疑的主要是上述语境中对资源的定义。 根据同一个RFC(7231), resource的定义是:

Resources: The target of an HTTP request is called a "resource". HTTP does not limit the nature of a resource; it merely defines an interface that might be used to interact with resources. Each resource is identified by a Uniform Resource Identifier (URI), as described in Section 2.7 of [RFC7230]. When a client constructs an HTTP/1.1 request message, it sends the target URI in one of various forms, as defined in (Section 5.3 of [RFC7230]). When a request is received, the server reconstructs an effective request URI for the target resource (Section 5.5 of [RFC7230]). One design goal of HTTP is to separate resource identification from request semantics, which is made possible by vesting the request semantics in the request method (Section 4) and a few request-modifying header fields (Section 5). If there is a conflict between the method semantics and any semantic implied by the URI itself, as described in Section 4.2.1, the method semantics take precedence.

所以在我的理解中,404状态代码不应该用于成功的GET请求,结果为空。(例如:一个没有特定过滤器结果的列表)

Just an addition from a developer that struggled many times with this situation. As you might have noticed it is always a discussion whether you return a 404 or 200 or 204 when a particular resource does not exist. The discussion above shows that this topic is pretty confusing and opinion based ( while there is a http-status-code standard existing ). I personally recommend, as it was not mentioned yet I guess, no matter how you decide DOCUMENT IT IN YOUR API-DEFINITION. Of course a client-side developer has in mind when he/she uses your particular "REST"- api to use his/her knowledge about Rest and expects that your api works this way. I guess you see the trap. Therefor I use a readme where I explicitly define in which cases I use which status code. This doesn't mean that I use some random definion. I always try to use the standard but to avoid such cases I document my usage. The client might think you are wrong in some specific cases but as it is documented, there is no need for additional discussions what saves time for you and the developer.

One sentence to the Ops question: 404 is a code that always comes in my mind when I think back about starting to develop backend-applications and I configured something wrong in my controller-route so that my Controller method is not called. With that in mind, I think if the request does reach your code in a Controller method, the client did a valid request and the request endpoint was found. So this is an indication not to use 404. If the db query returns not found, I return 200 but with an empty body.

这个话题中的答案(在撰写本文时已经有26个)完美地说明了开发人员理解他们正在使用的构造的语义是多么重要。

如果不理解这一点,那么响应状态代码是响应的属性而不是其他属性就不明显了。这些代码存在于响应的上下文中,它们在此上下文中之外的含义是未定义的。

响应本身就是请求的结果。请求对资源进行操作。资源、请求、响应和状态代码是HTTP的结构,就HTTP而言:

HTTP提供了与资源(第2节)交互的统一接口,无论其类型、性质或实现如何,通过操作和传输表示(第3节)。

换句话说,响应状态码的范围受到一个接口的限制,该接口只关心一些目标资源,并处理用于与这些资源交互的消息。服务器应用程序逻辑超出了范围,您使用的数据也不重要。

当使用HTTP时,它总是与资源一起使用。资源被以太转移或操纵。在任何情况下,除非我们在量子世界中,资源要么存在要么不存在,不存在第三种状态。

如果发出HTTP请求来获取(传输)资源的表示(如本问题中所示),而资源不存在,则响应结果应该显示一个带有相应404代码的失败。目标-获取表示-没有达到,资源没有找到。在HTTP上下文中不应该有对结果的其他解释。

RFC 7231超文本传输协议(HTTP/1.1):语义和内容,在这里多次提到,但主要是作为状态码描述的参考。我强烈建议通读整个文档,而不仅仅是第6节,以便更好地理解HTTP接口及其组件的作用域和语义。