HttpRequest::getRequestHeaders 似乎只是 return headers 的一个子集？

Question

如您所见，我提出了一个成功的请求。我遇到的问题是我在下面打印出来的第 3 行。

var headerList = request.getAllResponseHeaders();
print("RunTime type of Header List: ${headerList.runtimeType}");
print("Header List Count: ${headerList.length}");
print("Header List is as follows: \n$headerList");

看来 HttpRequest 请求的信息 return 不够。我希望它 return 可以是所有 header 信息的完整字符串、k=>v 对的映射或数组。

好像只获取了前 64 个字符。

为什么它不能获取所有文件？理想情况下，我试图通过 request.getResponseHeader("Content-Disposition"); 获取 "Content-Disposition" header，但正如您可以想象的那样，鉴于此信息，它实际上将 return 为空，因为请求找不到该信息。

Answer 1

我猜你需要添加

Access-Control-Expose-Headers Content-Disposition

在您的服务器上。

Access-Control-Expose-Headers (optional) - The XMLHttpRequest 2 object has a getResponseHeader() method that returns the value of a particular response header. During a CORS request, the getResponseHeader() method can only access simple response headers. Simple response headers are defined as follows:

Cache-Control

Content-Language

Content-Type

Expires

Last-Modified

Pragma

If you want clients to be able to access other headers, you have to use the Access-Control-Expose-Headers header. The value of this header is a comma-delimited list of response headers you want to expose to the client.

来自http://www.html5rocks.com/en/tutorials/cors/

HttpRequest::getRequestHeaders 似乎只是 return headers 的一个子集？

HttpRequest::getRequestHeaders only seems to return a subset of headers?

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