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问为什么chrome对某些资源尊重缓存控制头，而对其他资源则不尊重？
EN

Stack Overflow用户

提问于 2014-01-16 02:52:03

回答 1查看 2.2K关注 0票数 2

我有一个AJAX应用程序，其设置如下：

动态内容由本地主机的node.js服务器提供:8000
静态内容由本地主机上的jetty服务器提供:8080。

有两种动态内容：

基于SQL查询结果的真正动态内容
组合式处理程序的结果，该处理程序连接文件。实际上，这个内容永远不会改变，所以它也可以被认为是静态的。

我采取以下步骤：

清除铬浏览缓存(设置->清除浏览数据. ->空缓存)
刷新应用程序
刷新应用程序

静态内容以及组合体处理程序生成的内容都有cache-control头，而后者也有过期标头。

我预计第一次刷新将加载所有资源，但第二次只是真正的动态内容。即使如此，也不会返回任何内容，因为没有修改任何内容。

实际上，浏览器加载更多的资源，然后它就应该加载资源。

请在下面找到第一次刷新后浏览器所做请求的摘要(组合式urls非常长，因此为了清楚起见，我截断了它们)：

#   Result  Protocol    Host            URL                                                                                             Body    Caching                                                         Content-Type                            Process
1   200     HTTP        localhost:8000  /                                                                                               14,348                                                                  text/html; charset=utf-8                chrome:3852         
2   200     HTTP        localhost:8000  /combo?yui/cssreset/cssreset-min.css&yui/cssfonts/cssfonts-min.css                              638     public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:49 GMT text/css; charset=utf-8                 chrome:3852         
3   200     HTTP        localhost:8080  /if/admin.min.css                                                                               22,176  public,max-age=31536000                                         text/css                                chrome:3852         
4   200     HTTP        localhost:8080  /yui/yui/yui-min.js                                                                             25,586  public,max-age=31536000                                         application/javascript                  chrome:3852         
5   200     HTTP        localhost:8080  /if/admin.min.js                                                                                37,889  public,max-age=31536000                                         application/javascript                  chrome:3852         
6   200     HTTP        localhost:8000  /combo?yui/cssgrids/cssgrids-min.css&yui/widget-base/assets/skins/sam/widget-base.css&...       6,223   public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:49 GMT text/css; charset=utf-8                 chrome:3852         
7   200     HTTP        localhost:8000  /combo?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&...                          97,019  public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:49 GMT application/javascript; charset=utf-8   chrome:3852         
8   200     HTTP        localhost:8000  /combo?yui/dataschema-json/dataschema-json-min.js&yui/dataschema-xml/dataschema-xml-min.js&...  46,248  public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:50 GMT application/javascript; charset=utf-8   chrome:3852         
9   200     HTTP        localhost:8000  /combo?yui-gallery/gallery-querybuilder/assets/skins/sam/gallery-querybuilder.css&...           872     public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:51 GMT text/css; charset=utf-8                 chrome:3852         
10  200     HTTP        localhost:8000  /combo?yui-gallery/gallery-formmgr/gallery-formmgr-min.js&...                                   4,627   public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:51 GMT application/javascript; charset=utf-8   chrome:3852         
11  200     HTTP        localhost:8000  /combo?yui-gallery/gallery-node-optimizations/gallery-node-optimizations-min.js&...             2,269   public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:51 GMT application/javascript; charset=utf-8   chrome:3852         
12  200     HTTP        localhost:8000  /combo?yui/substitute/substitute-min.js                                                         1,006   public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:15:51 GMT application/javascript; charset=utf-8   chrome:3852         
13  200     HTTP        localhost:8000  /api/context                                                                                    81,238                                                                  application/json; charset=utf-8         chrome:3852         
14  200     HTTP        localhost:8080  /yui/assets/skins/sam/sprite.png                                                                2,913   public,max-age=31536000                                         image/png                               chrome:3852         
15  200     HTTP        localhost:8080  /yui/node-menunav/assets/skins/sam/horizontal-menu-submenu-indicator.png                        157     public,max-age=31536000                                         image/png                               chrome:3852

备注：

请求1和13生成真正的动态内容-1是呈现为html的玉模板，13是SQL查询的结果。
请求3、4、5、14和15生成静态内容(注意端口号为8080)
其余的请求是组合请求-动态的法律上的，但静态的事实上。

下面是这个摘要在第二次刷新之后的样子：

#   Result  Protocol    Host            URL                                                                                             Body    Caching Content-Type                                                Process
1   304     HTTP        localhost:8000  /                                                                                               0                                                                           chrome:3852         
2   304     HTTP        localhost:8000  /combo?yui/cssreset/cssreset-min.css&yui/cssfonts/cssfonts-min.css                              0       public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:38:55 GMT     chrome:3852         
3   304     HTTP        localhost:8080  /if/admin.min.css                                                                               0                                                                           chrome:3852         
4   304     HTTP        localhost:8080  /yui/yui/yui-min.js                                                                             0                                                                           chrome:3852         
5   304     HTTP        localhost:8080  /if/admin.min.js                                                                                0                                                                           chrome:3852         
6   304     HTTP        localhost:8000  /combo?yui/cssgrids/cssgrids-min.css&yui/widget-base/assets/skins/sam/widget-base.css&...       0       public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:38:55 GMT     chrome:3852         
7   304     HTTP        localhost:8000  /combo?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&...                          0       public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:38:55 GMT     chrome:3852         
8   304     HTTP        localhost:8000  /combo?yui/dataschema-json/dataschema-json-min.js&yui/dataschema-xml/dataschema-xml-min.js&...  0       public,max-age=31536000; Expires: Fri, 16 Jan 2015 02:38:56 GMT     chrome:3852         
9   304     HTTP        localhost:8000  /api/context                                                                                    0                                                                           chrome:3852

注意，第一个摘要中的请求9-12、14和15的URL不在第二个摘要中--浏览器缓存它们。但是，为什么浏览器不缓存请求2-8(从第一个摘要中)，这些请求似乎具有与缓存的请求相同的特性？

附录A

请在下面找到第一次刷新后所有请求和响应的完整标题(我使用了一个新的会话，因此日期与上面提供的简短摘要不同)：

GET / HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Content-Type: text/html; charset=utf-8
ETag: "-1836563736"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:55 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui/cssreset/cssreset-min.css&yui/cssfonts/cssfonts-min.css HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:18 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:55 GMT
Content-Type: text/css; charset=utf-8
ETag: "-1463284566"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:55 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /yui/yui/yui-min.js HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Type: application/javascript
Accept-Ranges: bytes
Cache-Control: public,max-age=31536000
Last-Modified: Tue, 14 Jan 2014 11:59:00 GMT
ETag: W/"4gIxoOsipQY4gIw4Hu8s3Y"
Content-Length: 25586
Server: Jetty(9.1.0.v20131115)

---
GET /if/admin.min.css HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Type: text/css
Accept-Ranges: bytes
Cache-Control: public,max-age=31536000
Last-Modified: Tue, 14 Jan 2014 11:59:00 GMT
ETag: W/"vSW0rAEe/b8vSW17JGA3h4"
Content-Length: 22176
Server: Jetty(9.1.0.v20131115)

---
GET /if/admin.min.js HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Type: application/javascript
Accept-Ranges: bytes
Cache-Control: public,max-age=31536000
Last-Modified: Tue, 14 Jan 2014 11:59:00 GMT
ETag: W/"7VPNTHzTc387VPMDOxNk7k"
Content-Length: 37889
Server: Jetty(9.1.0.v20131115)

---
GET /combo?yui/cssgrids/cssgrids-min.css&yui/widget-base/assets/skins/sam/widget-base.css&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:22 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:55 GMT
Content-Type: text/css; charset=utf-8
ETag: "1986623550"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:55 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Thu, 02 May 2013 22:59:53 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:55 GMT
Content-Type: application/javascript; charset=utf-8
ETag: "1918884200"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:55 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui/dataschema-json/dataschema-json-min.js&yui/dataschema-xml/dataschema-xml-min.js&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:24 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:56 GMT
Content-Type: application/javascript; charset=utf-8
ETag: "1381642784"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui-gallery/gallery-querybuilder/assets/skins/sam/gallery-querybuilder.css&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Thu, 02 May 2013 22:59:53 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:56 GMT
Content-Type: text/css; charset=utf-8
Content-Length: 872
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive

---
GET /combo?yui-gallery/gallery-formmgr/gallery-formmgr-min.js&yui-gallery/gallery-overlay-extras/gallery-overlay-extras-min.js HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Thu, 02 May 2013 22:59:53 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:56 GMT
Content-Type: application/javascript; charset=utf-8
ETag: "264489472"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui-gallery/gallery-node-optimizations/gallery-node-optimizations-min.js&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Thu, 02 May 2013 22:59:53 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:56 GMT
Content-Type: application/javascript; charset=utf-8
ETag: "946735146"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /combo?yui/substitute/substitute-min.js HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:22 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 02:53:56 GMT
Content-Type: application/javascript; charset=utf-8
Content-Length: 1006
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive

---
GET /api/context HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
X-Requested-With: XMLHttpRequest
Accept: */*
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Content-Type: application/json; charset=utf-8
ETag: "1217632044"
Content-Encoding: gzip
Date: Thu, 16 Jan 2014 02:53:56 GMT
Connection: keep-alive
Transfer-Encoding: chunked

---
GET /yui/assets/skins/sam/sprite.png HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Accept: image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: public,max-age=31536000
Content-Type: image/png
Last-Modified: Tue, 23 Apr 2013 23:46:18 GMT
ETag: W/"oHo6+Hf6zcMoHo7xE6wr7I"
Content-Length: 2913
Server: Jetty(9.1.0.v20131115)

---
GET /yui/node-menunav/assets/skins/sam/horizontal-menu-submenu-indicator.png HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Accept: image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: public,max-age=31536000
Content-Type: image/png
Last-Modified: Tue, 23 Apr 2013 23:46:20 GMT
ETag: W/"jvhF7Fl3QdUjvhE0GA9Mag"
Content-Length: 157
Server: Jetty(9.1.0.v20131115)

---

附录B

请在下面找到第二次刷新后所有请求和响应的完整标题(我使用了一个新的会话，因此日期与上面提供的简短摘要不同)：

GET / HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
If-None-Match: "-1836563736"

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
ETag: "-1836563736"
Date: Thu, 16 Jan 2014 03:03:44 GMT
Connection: keep-alive

---
GET /combo?yui/cssreset/cssreset-min.css&yui/cssfonts/cssfonts-min.css HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/css,*/*;q=0.1
If-None-Match: "-1463284566"
If-Modified-Since: Tue, 23 Apr 2013 23:46:18 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:18 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 03:03:44 GMT
ETag: "-1463284566"
Date: Thu, 16 Jan 2014 03:03:44 GMT
Connection: keep-alive

---
GET /if/admin.min.css HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/css,*/*;q=0.1
If-None-Match: W/"vSW0rAEe/b8vSW17JGA3h4"
If-Modified-Since: Tue, 14 Jan 2014 11:59:00 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
Vary: Accept-Encoding
ETag: W/"vSW0rAEe/b8vSW17JGA3h4"
Server: Jetty(9.1.0.v20131115)

---
GET /yui/yui/yui-min.js HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: */*
If-None-Match: W/"4gIxoOsipQY4gIw4Hu8s3Y"
If-Modified-Since: Tue, 14 Jan 2014 11:59:00 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
Vary: Accept-Encoding
ETag: W/"4gIxoOsipQY4gIw4Hu8s3Y"
Server: Jetty(9.1.0.v20131115)

---
GET /if/admin.min.js HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: */*
If-None-Match: W/"7VPNTHzTc387VPMDOxNk7k"
If-Modified-Since: Tue, 14 Jan 2014 11:59:00 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
Vary: Accept-Encoding
ETag: W/"7VPNTHzTc387VPMDOxNk7k"
Server: Jetty(9.1.0.v20131115)

---
GET /combo?yui/cssgrids/cssgrids-min.css&yui/widget-base/assets/skins/sam/widget-base.css&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: text/css,*/*;q=0.1
If-None-Match: "1986623550"
If-Modified-Since: Tue, 23 Apr 2013 23:46:22 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:22 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 03:03:44 GMT
ETag: "1986623550"
Date: Thu, 16 Jan 2014 03:03:44 GMT
Connection: keep-alive

---
GET /combo?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: */*
If-None-Match: "1918884200"
If-Modified-Since: Thu, 02 May 2013 22:59:53 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Thu, 02 May 2013 22:59:53 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 03:03:44 GMT
ETag: "1918884200"
Date: Thu, 16 Jan 2014 03:03:44 GMT
Connection: keep-alive

---
GET /combo?yui/dataschema-json/dataschema-json-min.js&yui/dataschema-xml/dataschema-xml-min.js&... HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Cache-Control: max-age=0
Authorization: Basic YWRtaW46MTIz
Accept: */*
If-None-Match: "1381642784"
If-Modified-Since: Tue, 23 Apr 2013 23:46:24 GMT
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
Last-Modified: Tue, 23 Apr 2013 23:46:24 GMT
Cache-Control: public,max-age=31536000
Expires: Fri, 16 Jan 2015 03:03:45 GMT
ETag: "1381642784"
Date: Thu, 16 Jan 2014 03:03:45 GMT
Connection: keep-alive

---
GET /api/context HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Authorization: Basic YWRtaW46MTIz
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
X-Requested-With: XMLHttpRequest
Accept: */*
Referer: http://localhost:8000/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
If-None-Match: "1217632044"

HTTP/1.1 304 Not Modified
X-Powered-By: Express
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization, Content-Length, X-Requested-With
Vary: Accept-Encoding
ETag: "1217632044"
Date: Thu, 16 Jan 2014 03:03:46 GMT
Connection: keep-alive

---

编辑

我之所以提到Chrome，是因为这是我使用的浏览器。其他浏览器的行为可能会有所不同，现在我对Chrome特别感兴趣。

html

ajax

caching

cache-control

回答 1

Stack Overflow用户

发布于 2014-05-07 03:01:43

它确实缓存了它们，但是只要您按下刷新按钮，它就会强制对所有资源进行重新验证。您将注意到，它发送了If-None-Match和If-Modified-Since头，以便服务器能够有条件地响应，而服务器发送回304，表示缓存的副本仍然是新鲜的。我不知道为什么有些资源没有被重新验证。

如果您想在不重新验证的情况下执行“重新加载”，只需选择URL栏并按enter键即可。

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/21152518

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