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加入并发/相同的HTTP GET请求？

[英]Joining concurrent/identical HTTP GET requests?

原文 2013-03-21 03:21:06 3 1 ajax/ http/ browser/ get/ browser-cache

Do browsers join concurrent identical HTTP GET requests? 浏览器是否加入并发的相同HTTP GET请求？ At least, for static or cache-able content? 至少对于静态或可缓存内容？

That is, if something like this happens: 也就是说，如果发生这种情况：

| AJAX/HTTP-GET(resourceX)
| [start download]------------------------------------------->[finish download]
|
|            AJAX/HTTP-GET(resourceX)
|            [start download]--------->etc...
|
+------------------------------------------------------------------> Time

Will the browser figure out "Hey you're already trying to download resourceX! Don't try downloading it twice, it won't do anything!"? 浏览器会指出“嘿，您已经在尝试下载resourceX！不要尝试两次下载，它什么也不会做！”？

**Update: **更新：

Now of course, I can go to some site and try downloading a big file (eg, "BigFile"), and click the link twice; 当然，现在，我可以去某个站点尝试下载一个大文件（例如“ BigFile”），然后单击两次链接。 this will (duplicately) download both BigFile and BigFile(1). 这将（重复）下载BigFile和BigFile（1）。 Granted, it's an error on the user's part, but still... 当然，这是用户方面的错误，但仍然...

For cache-able resources (eg, downloading some javascript file), it seems pretty inefficient if browsers couldn't figure out these duplicates... 对于可缓存的资源（例如，下载一些javascript文件），如果浏览器无法找出这些重复项，则效率似乎非常低...

1 个解决方案

The browser won't notice. 浏览器不会注意到。 It acts just like regular HTTP traffic. 它的行为就像常规的HTTP流量一样。 It might cache the request once the first one is finished (if the proper cache-control fields are set), but concurrently, no. 一旦第一个请求完成（如果设置了正确的缓存控制字段），它可能会缓存请求，但同时不会。