javascript 从 http 标头响应中获取日期
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Getting Date from http header response
提问by EnderCode
Okay so I can access the HTTP ajax response header using
好的，所以我可以使用访问 HTTP ajax 响应头
xhr.getAllResponseHeaders();
but it doesn't seem to get the Date with it, though its there:
但它似乎没有得到日期，尽管它在那里：
[Chrome]
**Response Header**
Access-Control-Allow-Origin:*
Cache-Control:no-cache
Content-Length:8092
Content-Type:application/json; charset=utf-8
**Date:Thu, 15 Jan 2015 16:30:13 GMT**
Expires:-1
Pragma:no-cache
Server:Microsoft-IIS/8.0
TotalCount:116
X-AspNet-Version:4.0.30319
X-Powered-By:ASP.NET
and the code only shows this :
并且代码只显示了这一点：
[output on alert xhr.getAllResponseHeaders();]
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
here's the the ajax call:
这是 ajax 调用：
$.ajax({
url: url,
type: "GET",
contentType: "application/json;charset=utf-8",
async: true,
success: function (data,status, xhr) {
displayNewData(data);
alert(xhr.getAllResponseHeaders());
},
error: function () {
alert(url);
}
});
Is there a way where I can get the Date in the response header?
有没有办法在响应头中获取日期？
采纳答案by EnderCode
This Helped :
这有助于：
var req = new XMLHttpRequest();
req.open('GET', document.location, false);
req.send(null);
var headers = req.getAllResponseHeaders().toLowerCase();
alert(headers);
回答by Keywan Ghadami
It might be the case you are making a CORSrequest and the headers are filtered out for security reasons.
可能是您发出CORS请求并且出于安全原因过滤掉标头的情况。
See also similar question about missing response headers in ajax request. The solution might be to set this HTTP header in the server response:
另请参阅有关在 ajax 请求中丢失响应标头的类似问题。解决方案可能是在服务器响应中设置此 HTTP 标头：
Access-Control-Expose-Headers: Date
回答by Pere Pages
in your success method:
在您的成功方法中：
success: function (data,status, xhr) {
console.log(xhr.getResponseHeader('Date'));
},
If response is a success
如果响应成功
res=xhr.getResponseHeader('Date');
if response fails
如果响应失败
res=data.getResponseHeader('Date');
回答by Klanjabrik
If you are using Nginx, you can put below code in Nginx config file:
如果您使用的是 Nginx，您可以将以下代码放在 Nginx 配置文件中：
add_header 'Access-Control-Expose-Headers' 'Date';
for real config example:
对于实际配置示例：
location / {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Expose-Headers' 'Date';
root /usr/local/nginx/html;
index index.html index.htm;
}
After restarting your nginx service, you can call getAllResponseHeaders again and it will show you the "Date".
重新启动 nginx 服务后，您可以再次调用 getAllResponseHeaders，它会显示“日期”。
