rails如何确定传入请求格式？ [英] How does rails determine incoming request format?

问题描述

  respond_to do我想知道rails如何知道请求的格式| format | 
 format.html 
 format.xml 
 format.json 
 end 
  

作为一个例子，考虑这种情况我面对了。假设通过javascript（使用jQuery）我做了一个POST请求，说明 dataType：json

  $。 ajax（{
 type：'POST'，
 url：'example.com'，
 data：data，
 dataType：'json'
}）; 
 

当这个请求到达控制器动作时，站在ruby调试器里面，我检查@ request.format我可以看到内容类型是application / json。然后控制器按预期响应json格式。

但我对在路由中指定的格式符号感到困惑。假设向 example.com/parts.json 发出请求，但在请求中，内容类型为application / html或application / xml。 控制器是否响应json格式或html或xml？

谢谢！

解决方案

从 ActionController :: MimeResponds ：Rails从客户端提交的HTTP Accept头中确定所需的响应格式。

I'm just wondering how rails knows the format of the request as to correctly enter in the famous:

respond_to do |format|
  format.html
  format.xml
  format.json
end

As an example consider this situation I have faced up. Suppose that via javascript (using jQuery) I make a POST request expliciting dataType: json

$.ajax({
      type: 'POST',
      url: 'example.com',
      data: data,
      dataType: 'json'
    });

When this request reach controller action, standing inside it with ruby debugger, I inspect @request.format and I can see that content-type is application/json. Then the controller respond to json format as expected.

But I'm confused with the format symbol especified in the routes. Suppose that a request is made to example.com/parts.json but in the request the content type is application/html or application/xml. Is the controller responding to json format or html or xml??

Thanks!

解决方案

From ActionController::MimeResponds: "Rails determines the desired response format from the HTTP Accept header submitted by the client."

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