blocks|key|1237091|text|你不能这么做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237092|尝试向托管该文件的人发送电子邮件，并尝试让他们对其应用expires-headers。|1237093|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can't.

Try e-mailing the one(s) hosting the file and try to get them to apply expires-headers to it.

blocks|key|1451940|text|您只能在对发往您自己的服务器的请求的响应中添加标头字段。如果请求到达另一个服务器，比如Google的服务器，那么应答请求的就是Google的服务器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1451941|因此，您的问题的唯一解决方案是在您自己的服务器上托管外部资源。但是，只有当资源是静态的，不要在请求之间改变，并且不依赖于其他东西时，这才是可能的。|1451942|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can only add header fields in responses to requests that go to your own server. If the request goes to another server, say Google’s server, than it’s Google’s server that answers the request.

So the only solution to your problem is hosting that external resources on your own server. But that’s only possible if that resources are static, do not change from request to request and do not depend on other things.

blocks|key|1452007|text|这不可能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1452008|不推荐(并不总是可能的)：如果它是静态内容，使用脚本预取并设置您自己的头文件。|1452009|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Thats not possible.

Not recommended (and not always possible): If its static content, prefetch it with a script and set your own headers.

blocks|key|1237229|text|您可以使用PHP动态加载外部页面，这样就可以在输出原始数据之前发送标题。这不是一个理想的解决方案，但如果你真的必须这样做，你可能会想要使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237230|<?php
header('expire-header');

echo+file_get_contents('http://www.extern.al/website/url');|code-block|syntax|javascript|1237231|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could dynamically load the external pages using PHP, so you can send headers before outputting the original data. This is not an ideal solution but if you really have to you may want to use it.

<pre><code>&lt;?php
header('expire-header');

echo file_get_contents('http://www.extern.al/website/url');
</code></pre>

blocks|key|1452150|text|唯一的方法是创建脚本，从外部网站下载内容，然后添加所需的标题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1452151|<script+type="text/javascript"+src="http://external.example.com/foo.js"></script>|code-block|syntax|javascript|1452152|至|1452153|<script+type="text/javascript"+src="external.php?url=http://external.example.com/foo.js"></script>|1452154|而external.php则类似于|1452155|<?php
header("Expire-stuff:+something");
echo+file_get_contents($_GET['url']);|1452156|当然，这有安全漏洞，所以我建议使用像external.php?file=foo.js这样的标识符串，然后使用|1452157|$files+=+array('foo.js'+=>+'http://external/...');
if(isset($files[$_GET['file']]))
{
++echo+file_get_contents($files[$_GET['file']]);
}|1452158|当然，file_get_contents()会占用你的一些带宽，所以建议你也缓存结果。|1452159|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

The only way is to create script which downloads contents from external site and then adds needed headers.

<pre><code>&lt;script type="text/javascript" src="http://external.example.com/foo.js"&gt;&lt;/script&gt;
</code></pre>

To

<pre><code>&lt;script type="text/javascript" src="external.php?url=http://external.example.com/foo.js"&gt;&lt;/script&gt;
</code></pre>

And external.php is something like

<pre><code>&lt;?php
header("Expire-stuff: something");
echo file_get_contents($_GET['url']);
</code></pre>

Of course this has security hole so I'd recommend to use identifier strings like external.php?file=foo.js and then using 

<pre><code>$files = array('foo.js' =&gt; 'http://external/...');
if(isset($files[$_GET['file']]))
{
 echo file_get_contents($files[$_GET['file']]);
}
</code></pre>

file_get_contents() of course will take some of your bandwith so it would be recommended to cache the result also.

blocks|key|1452234|text|您可以添加一个查询字符串参数来欺骗浏览器，使其认为它正在请求不同的资源。例如，如果希望浏览器从不缓存CSS，则可以在URL的末尾添加一个问号，后跟一个随机数。这通常是有效的，但也可以由托管文件的服务器使其无效。试试看。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1452235|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You may be able to add a query string parameter to fool the browser into thinking it's requesting a different resource. For example, if you want the browser to never cache a CSS, you can add a question mark followed by a random number to the end of the URL. This usually works but can be made to not work by the server hosting the file. Try it and see.

blocks|key|1237470|text|以下内容可能会对您有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237471|​|1237472|ExpiresActive+On

ExpiresDefault+"access+plus+1+seconds"

ExpiresByType+image/x-icon+"access+plus+2692000+seconds"

ExpiresByType+image/jpeg+"access+plus+2692000+seconds"

ExpiresByType+image/png+"access+plus+2692000+seconds"

ExpiresByType+image/gif+"access+plus+2692000+seconds"

ExpiresByType+application/x-shockwave-flash+"access+plus+2692000+seconds"

ExpiresByType+text/css+"access+plus+2692000+seconds"

ExpiresByType+text/javascript+"access+plus+2692000+seconds"

ExpiresByType+application/x-javascript+"access+plus+2692000+seconds"

ExpiresByType+text/html+"access+plus+600+seconds"

ExpiresByType+application/xhtml%2Bxml+"access+plus+600+seconds"|code-block|syntax|javascript|1237473|1237474|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

The following may be useful for you. 



<pre><code>ExpiresActive On

ExpiresDefault "access plus 1 seconds"

ExpiresByType image/x-icon "access plus 2692000 seconds"

ExpiresByType image/jpeg "access plus 2692000 seconds"

ExpiresByType image/png "access plus 2692000 seconds"

ExpiresByType image/gif "access plus 2692000 seconds"

ExpiresByType application/x-shockwave-flash "access plus 2692000 seconds"

ExpiresByType text/css "access plus 2692000 seconds"

ExpiresByType text/javascript "access plus 2692000 seconds"

ExpiresByType application/x-javascript "access plus 2692000 seconds"

ExpiresByType text/html "access plus 600 seconds"

ExpiresByType application/xhtml+xml "access plus 600 seconds"
</code></pre>

blocks|key|1237504|text|我编写了一个代码版本，允许您为每个脚本指定不同的到期日期：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237505|<?php

$files+=+array(
++++'ga.js'+=>+'https://ssl.google-analytics.com/ga.js',
++++'bsa.js'+=>+'https://s3.buysellads.com/ac/bsa.js',
++++'pro.js'+=>+'https://s3.buysellads.com/ac/pro.js'
);

if(isset($files[$_GET['file']]))+{
++++if+($files[$_GET['file']]+==+'ga.js'){
++++++++header('Expires:+'.gmdate('D,+d+M+Y+H:i:s+\G\M\T',+time()+%2B+((60+*+60)+*+48)));+//+2+days+for+GA
++++}+else+{
++++++++header('Expires:+'.gmdate('D,+d+M+Y+H:i:s+\G\M\T',+time()+%2B+(60+*+60)));+//+Default+set+to+1+hour
++++}

++++echo+file_get_contents($files[$_GET['file']]);
}

?>|code-block|syntax|javascript|1237506|更多信息：https://www.catswhocode.com/blog/php-how-to-add-expire-headers-for-external-scripts|offset|length|1237507|entityMap|0|LINK|mutability|MUTABLE|url|https://www.catswhocode.com/blog/php-how-to-add-expire-headers-for-external-scripts^0|0|0|5|2B|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I have made a version of that code that let you specify different expire dates for each scripts:

<pre><code>&lt;?php

$files = array(
 'ga.js' =&gt; 'https://ssl.google-analytics.com/ga.js',
 'bsa.js' =&gt; 'https://s3.buysellads.com/ac/bsa.js',
 'pro.js' =&gt; 'https://s3.buysellads.com/ac/pro.js'
);

if(isset($files[$_GET['file']])) {
 if ($files[$_GET['file']] == 'ga.js'){
 header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + ((60 * 60) * 48))); // 2 days for GA
 } else {
 header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + (60 * 60))); // Default set to 1 hour
 }

 echo file_get_contents($files[$_GET['file']]);
}

?&gt;
</code></pre>

More info: <a href="https://www.catswhocode.com/blog/php-how-to-add-expire-headers-for-external-scripts" rel="nofollow noreferrer">https://www.catswhocode.com/blog/php-how-to-add-expire-headers-for-external-scripts</a>

blocks|key|1237557|text|不要因为这些页面测试而失去理智...其中一些建议可能是有用的，而有些建议你什么也做不了。对你自己的文件做任何你能做的事情，不要介意外部的文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237558|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Don't lose your mind for these page tests... some of the recommendations may be useful and some of them you can't do anything. Do whatever you can do with your own files, don't mind about external ones.

I have a website and I added the expire headers on all pages/images and scripts but I don’t know how I could add expire headers to external scripts. 

For example Google Analytics - it has expire headers set to 1 day. 

Google is not my problem, some other scripts from external websites are the real problem, they don't have expire headers at all.

How can I add expire headers for scripts that are not on my server?

服务器

我有一个网站，我在所有页面/图像和脚本上添加了Expire头，但我不知道如何将Expire头添加到外部脚本。例如，Google Analytics -它将过期标题设置为1天。Google不是我的问题，来自外部网站的一些其他脚本才是真正的问题，它们根本没有Expire头。

问如何为不在我的服务器上的脚本添加Expire头？
EN

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