浏览器对 json ajax 响应的 Content-Type 标头有什么要求?

问题描述

我正在返回一些需要由 javascript 处理的 json 作为对 XMLHTTPRequest 的响应.

如果我将响应的内容类型设置为text/plain"，除 Chrome 之外的所有浏览器都会接受它并将其传递给我的 JS，没有问题.但是，Chrome 会将响应包装在

在将其传递给我的 javascript 之前.
如果我将响应的内容类型设置为正确"应用程序/json"，所有浏览器，但 Firefox 将接受它并将其传递给我的 JS，没有问题.但是，Firefox 会要求将响应保存或打开为文件.
什么是正确的跨浏览器内容类型?
 解决方案 
您可以通过使用jQuery funcion parseJSON - http://api.jquery.com/jQuery.parseJSON/
您传递给函数的参数是 JSON 对象字符串，您从响应数据中提取:
function AjaxResponse (data) {//AJAX post 回调var jsonResult = $.parseJSON(data.substring(data.indexOf("{"), data.lastIndexOf("}") + 1));}
在 FF 和 IE8 中针对以下简单 JSON 结果进行了测试(除了 Chrome 解决了哪个问题)，对于其他浏览器和更复杂的响应，无法保证...
<小时>
注意:我认为这种情况下的内容类型是 text/plain 或 text/html - 我使用了以下 ASP.Net MVC 函数来返回结果
ContentResult System.Web.Mvc.Controller.Content(string content);
我返回 JSON 对象的位置，如
System.Web.Script.Serialization.JavaScriptSerializer jsonSerializer= 新 System.Web.Script.Serialization.JavaScriptSerializer();var jsonResponse = jsonSerializer.Serialize(新 { IArticleMediaId = 0, ImageUrl = Url.Content(fullImgPath)});返回内容(jsonResponse)；
I am returning some json which needs to be handled by javascript as the response to an XMLHTTPRequest.

If I set the response's content type to "text/plain", all browsers but Chrome will accept it and pass it to my JS with no problem. However, Chrome will wrap the response in 
<pre style="word-wrap: break-word; white-space: pre-wrap;"> 
before passing it to my javascript.

If I set the response's content type to the "proper"  "application/json" all browsers but Firefox will accept it and pass it to my JS with no problem. Firefox, however will ask to save or open the response as a file.

What's the correct, cross-browser Content-Type?
 解决方案 
You may solve the issue by parsing the response into the JSON object by using jQuery funcion parseJSON - http://api.jquery.com/jQuery.parseJSON/

The parameter you pass into the function is the JSON object string, which you extract from the response data:
function AjaxResponse (data) {  // AJAX post callback 
  var jsonResult = $.parseJSON(data.substring(data.indexOf("{"), data.lastIndexOf("}") + 1));
}
Tested (besides Chrome which problem this solves) in FF and IE8 for the following simple JSON result, for other browsers and more complex responses no guarantees...



NOTE: the content type in this case is text/plain or text/html I think - I've used the following ASP.Net MVC function to return the result
ContentResult System.Web.Mvc.Controller.Content(string content);
Where I returned the JSON object like
System.Web.Script.Serialization.JavaScriptSerializer jsonSerializer 
    = new System.Web.Script.Serialization.JavaScriptSerializer();
var jsonResponse = jsonSerializer.Serialize(
    new { IArticleMediaId = 0
        , ImageUrl = Url.Content(fullImgPath)
        });
return Content(jsonResponse);


                        
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