request.format returns * / * [英] request.format returning */*

问题描述

我目前正在为RoR上的应用程序开发API

I'm currently developing an API for my application on RoR

例如，我创建了一些XML，加载了创建对象所需的所有信息，让我们说一个Person，并使用Curl我将它提交到我的应用程序

As an example, I created some XML, loaded with all the info I need to create the object, let's say a Person, and using Curl I submitted it to my application

我可以从控制器和哈希参数调用我想要的创建操作对象被正确传递

I'm able to call exactly the create action I want from the controller and the hash params of the object are being passed correctly

但现在我需要应用不同的行为，如果请求是否与XML，是什么困扰我是为什么在控制器请求。

But now I need to apply a different behaviour if request was made or not with XML, what is bothering me is why in the controller request.format gives "/".

任何线索？

curl -v -H "Content-Type: application/xml; charset=utf-8" --data-ascii @client.xml  http://foo.com:3000/clients?api_key=xxx

def create
  logger.debug request.format # produces "*/*"
  if request.format.xml?
    # never gets here 
  end
end

推荐答案

* / * 表示用户代理接受所有格式，不关心您提供的格式。我相信Safari这样做，等等。默认情况下， curl 发送 * / * 的Accept标头。

*/* means that the user-agent accepts all formats and doesn't care what format you give it. I believe Safari does this, among others. By default, curl sends an Accept header of */*.

这里是头文件的转储 curl 默认发送：

Here is a dump of the headers curl sends by default:

User-Agent: curl/7.18.1 (i386-apple-darwin9.6.0) libcurl/7.18.1 zlib/1.2.3
Host: example.com
Accept: */*
Content-Type: 

但是，在这种情况下， XML如果发送给您的有效负载是XML？如果是这种情况，您想要直接检查请求的Content-Type头。

However, in this case, it looks like you want to send back XML if the payload sent to you was XML? If that's the case, you want to check the request's Content-Type header directly. i.e., request.content_type is the method you want.

附录：我想到的是 request.content_type 更多关于这一点，我认为最好的方法是首先检查 request.format ，只有如果是不确定检查 request.content_type 。基本上，HTTP规范为客户端提供了能够告诉服务器我给你XML，但我想要回来的JSON。 Accept标头是客户端如何告诉你他们想要什么，如果有人实际发送它，你应该尊重。如果客户端没有指定，只使用请求的Content-Type作为提示。

Addenda: I thought a bit more about this, and I think the best approach is to first check request.format and only if that is inconclusive check request.content_type. Essentially, the HTTP spec provides for clients being able to tell servers that "I'm giving you XML, but I want JSON back." The Accept header is how clients tell you what they want back, and if someone actually sends it, you should honor that. Only use the request's Content-Type as a hint if the client didn't specify.

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