[英]Can I perform an XMLHttpRequest if I don't know the response type?
I wish to perform an XMLHttpRequest
to GET
a resource, but the catch is that the resource can be in two different formats, and I don't know which one. 我希望执行XMLHttpRequest
来GET
资源,但是要注意的是该资源可以采用两种不同的格式,但我不知道哪种格式。 The first one is a textual application/json
, in which case I want a string
or an already parsed object; 第一个是文本application/json
,在这种情况下,我需要一个string
或一个已经解析的对象; and the second one is a binary application/zip
, in which case I want a Blob
that I can then process with JSZip. 第二个是二进制application/zip
,在这种情况下,我需要一个Blob
,然后可以使用JSZip处理它。 I could always request it as a Blob
, check the response headers, and then use a FileReader
to convert it to a string
if necessary, but this feels kinda clunky. 我总是可以将其请求为Blob
,检查响应头,然后在必要时使用FileReader
将其转换为string
,但这有点笨拙。 Is there a better way? 有没有更好的办法? Browser compatibility requirement: IE10+ and the latest whatever else. 浏览器兼容性要求:IE10 +和最新版本。
The simplest approach would be to set .responseType
to Blob
, check .type
of .response
. 最简单的方法是将.responseType
设置为Blob
,检查.response
.type
。 If .type
is "application/json"
, use FileReader.prototype.readAsText()
to get JSON
, else use Blob
.response
. 如果.type
是"application/json"
,则使用FileReader.prototype.readAsText()
获取JSON
,否则使用Blob
.response
。
You can also perform a HEAD
request before the actual request, check Content-Type
header to determine how to process response of actual request. 您还可以在实际请求之前执行HEAD
请求,检查Content-Type
标头以确定如何处理实际请求的响应。
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