blocks|key|2033433|text|简单得多：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2033434|config.middleware.delete+Rack::ETag|code-block|syntax|javascript|2033435|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|$]]

much easier:

<pre><code>config.middleware.delete Rack::ETag
</code></pre>

blocks|key|733138|text|将response.etag+=+nil放在before_filter中不起作用。etag是在发送响应之前生成的(它是从正文中计算出来的，所以在所有呈现完成之后)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|733139|禁用etag使用和生成(从而节省花费在md5上的时间)的正确解决方法是在这个猴子补丁中：|733140|module+ActionController
++class+Request
++++#+never+match+any+incomming+etag
++++def+etag_matches?(etag)
++++++false
++++end
++end

++class+Response
++++#+fake+rails+that+our+response+already+has+an+etag+set+and+so+none+is+generated+automatically
++++def+etag?
++++++true
++++end
++end
end|code-block|syntax|javascript|733141|entityMap^0|1|J|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Putting <code>response.etag = nil</code> in a before_filter does not work. The etag is generated just before the response is send (it's caluculated from the body so after all rendering has been done).

The proper workaround to disable etag use and generation (and so save the time spend in md5) it this monkey patch:

<pre><code>module ActionController
 class Request
 # never match any incomming etag
 def etag_matches?(etag)
 false
 end
 end

 class Response
 # fake rails that our response already has an etag set and so none is generated automatically
 def etag?
 true
 end
 end
end
</code></pre>

blocks|key|933372|text|在ActionController::Response对象上有一个etag设置器方法，如果ETag+HTTP头为空，它将删除它，因此您应该能够在控制器中清除它(可能是在之前的筛选器中)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|933373|response.etag+=+nil|code-block|syntax|javascript|933374|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/classes/ActionController/Response.html#M000621^0|1|Q|X|4|X|4|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

There's an <a href="http://api.rubyonrails.org/classes/ActionController/Response.html#M000621" rel="nofollow noreferrer"><code>etag</code></a> setter method on the <code>ActionController::Response</code> object, which deletes the ETag HTTP header if it's blank, so you should just be able to clear it in your controller (probably in a before filter):

<pre><code>response.etag = nil
</code></pre>

blocks|key|2341931|text|我不认为它们在默认情况下是打开的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2341932|我的理解是，它们需要使用stale?/fresh_when+call或类似的方法显式设置。|2341933|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|$]]

I don't think they are on by default.

My understanding is that they need to be explicitly set using stale?/fresh_when call or similar.

blocks|key|2342132|text|我在WEBrick上的Rails+4中工作，试图获得对缓存的响应，直到它在每天的特定时间过期。看起来自动生成的ETag正在干扰过期缓存，这就是我搜索此答案的原因。我在这里没有找到任何有用的东西，但我确实解决了我的问题，所以我将分享。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2342133|tl;dr设置Last-Modified头|offset|length|style|CODE|2342134|但是设置成什么呢？在我的情况下，我试图优化一个web服务，该服务返回每天在同一时间运行的进程的结果。我的响应报头最终如下所示：|2342135|response.headers['Cache-Control']+=+"max-age=86400"
response.headers['Expires']+=+getCacheTime
response.headers['Last-Modified']+=+getLastModified|code-block|syntax|javascript|2342136|首先，您需要显式地编写Cache-Control标头，以覆盖任何默认值。我将我的设置为24小时，以与我的过期标头的最大值一致。我使用如下所示的函数设置了过期标头：|2342137|def+getCacheTime
++++now+=+Time.now.utc
++++cacheTime+=+Time.utc(now.year,+now.month,+now.day,+22,+00,+00)
++++if+now+>+cacheTime
++++++++cacheTime+=+cacheTime+%2B+(60+*+60+*+24)
++++end

++++cacheTime.httpdate
end|2342138|与getCacheTime函数相比，getLastModified函数返回的时间恰好要短24小时。似乎设置它会抑制ETag+(另一个验证缓存头)，至少在我当前的开发环境中是这样。|2342139|entityMap^0|0|7|D|0|0|0|B|D|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

I am working in Rails 4 on WEBrick, trying to get a response to cache until it expires at a specific time each day. It looks like the auto-generated ETag is interfering with the expiration cache which is why I searched for this answer. I didn't find anything helpful here, but I did solve my problem, so I'll share.

tl;dr Set the <code>Last-Modified</code> header

But set it to what? In my situation I was trying to optimize a web service that returned the results of a process that runs at the same time every day. My response headers ended up looking like this:

<pre><code>response.headers['Cache-Control'] = "max-age=86400"
response.headers['Expires'] = getCacheTime
response.headers['Last-Modified'] = getLastModified
</code></pre>

First you want to explicitly write the <code>Cache-Control</code> header to overwrite whatever the default is. I set mine to be 24 hours to coincide with the maximum of my expiration header. I set the expiration header with a function the looks something like this:

<pre><code>def getCacheTime
 now = Time.now.utc
 cacheTime = Time.utc(now.year, now.month, now.day, 22, 00, 00)
 if now &gt; cacheTime
 cacheTime = cacheTime + (60 * 60 * 24)
 end

 cacheTime.httpdate
end
</code></pre>

The getLastModified function returns exactly 24 hours less than the getCacheTime function. It seems that setting this will suppress the ETag (another validation caching header) at least in my current development environment.

blocks|key|933402|text|为什么不在应用程序控制器中添加一个将etag设置为nil的before_filter呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|933403|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|$]]

Why not add a before_filter in your application controller which sets etag to nil?

Greetings,

How do I turn off ETag(s) in Ruby on Rails v2.3.5

When I do a direct request to to the RoR/Mongrel an ETag header is present.

TIA,

-daniel

Ruby on Rails, how to disable/turn off ETag

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

大家好，如何在Ruby on Rails v2.3.5中关闭ETag当我向RoR/Mongrel发出直接请求时，会出现一个ETag标头。蒂娅-daniel

问Ruby on Rails，如何禁用/关闭ETag
EN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Ruby on Rails，如何禁用/关闭ETagEN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Ruby on Rails，如何禁用/关闭ETag
EN