Javascript.在不下载内容的情况下检查URL的响应类型 [英] Javascript. Checking the type of response from a URL without downloading content

问题描述

我有一个Web应用程序，可以在服务器上运行报告.这些报告在服务器上存储了一定的时间.当我发送报告URL时，服务器要么将报告发送回(XLS格式)，要么返回简单的找不到文件"文本(无错误) 下次用户登录时，我希望能够检查报告是否仍然存在或需要再次运行.我可以简单地使用JQuery.ajax在后台调用URL并检查得到的响应类型.但是，这意味着这些报告已全部下载，我有10个(如果不是100个)潜在报告. 有什么方法可以查询服务器，以便仅获得将要获得的响应类型，而无需下载内容(即XLS或二进制文件->报告可用；文本->报告丢失)? 请注意，我无法控制服务器的行为. 谢谢

I have a web application that can run reports on a server. The reports are stored on the server for a certain amount of time. When I send the report URL, the server either sends the report back (in XLS format) or it returns a simple "file not found" text (no error) Next time the user logs in, I want to be able to check if the report is still there or it needs to be run again. I could simply use JQuery.ajax to call the URL in the background and check the type of response I get. However, this means that the reports are downloaded fully and I have 10s if not 100s of potential reports. Is there any way that I can query the server so that I only get the type of response that I will get, without downloading the content (i.e. XLS, or binary-> the report is available; text -> the report is missing)? Note that I have no control over the behavior of the server. Thanks

推荐答案

关闭循环，感谢您的评论，这促使我提出了此解决方案.使用JQuery，这就是我想出的方法，它似乎可以工作:

Closing the loop, thanks for your comments that led me to this solution. Using JQuery this is what I have come up with, which seems to work:

req=$.ajax({
    type:'HEAD',
    url:'url',
success: function() {
            if(req.getAllResponseHeaders().indexOf("ms-excel.sheet")>=0{}//report is available            
            else{} //report is not available             
        }
});

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