强制所有收到的请求 Content-Type 为 JSON [英] Force all received requests Content-Type to JSON

问题描述

我实际上正在开发一个使用 Rails 4 的 API.如果客户端没有在 中指定媒体类型，我想将请求的 Content-Type 设置为 JSON内容类型 标题.

I'm actually working on an API which uses Rails 4. I would like to set the Content-Type of a request to JSON if the client does not specify a media type in Content-Type header.

为了获得这种行为，我尝试在我的 ApplicationController 中添加以下 before_action :

In order to get that behaviour I tried to add the following before_action in my ApplicationController :

def set_request_default_content_type
  request.format = :json
end

在我的 RegistrationsController#create 方法中，我有一个断点来检查是否一切正常.好吧，request.format 技巧不起作用，尽管值设置为 application/json 似乎控制器(或 Rails 内部)不考虑接收到的请求的内容类型为 JSON.

In my RegistrationsController#create method I have a breakpoint to check if everything is working. Well, the request.format trick does not work, despite the value is set to application/json it seems that the controller (or Rails internals) do not consider the received request's Content-Type as JSON.

我用以下正文(没有内容类型)做了一个 POST 请求:

I did a POST request with the following body (and no Content-Type) :

{"user" : {"email":"[e-mail]","password":"foobarfoo"}}

通过使用 Pry 进行调试，我看到:

By debugging with Pry I see that :

 [2] api(#<V1::RegistrationsController>) _  request.format.to_s
 => "application/json"
 [3] api(#<V1::RegistrationsController>) _  params
 => {
       "action" => "create",
   "controller" => "v1/registrations"
 }

这意味着 Rails 没有考虑我的 request.format 配置了 Mime::JSON 的请求，而是使用了 Mime::ALL ，所以它没有'不解析请求的 JSON 正文.:(

It means that Rails did not have considered my request with the request.format configured with Mime::JSON, but instead with Mime::ALL and so it didn't parse the request's JSON body. :(

推荐答案

检查这个 SO answer.它使用 constraints 如下

Check this SO answer. It uses constraints as follows

defaults format: :json do
  # your v1/registration route here
end

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