获取浏览器发送If-None-Match和If-Modified- send

Question

我的浏览器没有为PHP生成的内容发回If-Modified-Since标头

在第一次请求时，我的脚本发送：

(Status-Line) HTTP/1.1 200 OK
Date Thu, 21 Jan 2010 08:55:25 GMT
Server Apache/2.2.11 (Win32) PHP/5.2.9-1
X-Powered-By PHP/5.2.9-1
Pragma no-cache
x-ua-compatible IE=8;FF=3;OtherUA=4
Last-Modfied Sat, 02 Jan 2010 02:02:20 GMT
Content-Length 28453
Etag b98e0795b509be20146f58e06fbb624f
Keep-Alive timeout=5, max=90
Connection Keep-Alive
Content-Type image/png

在它发送的第二个请求中：

(Request-Line) GET /kincumberunitingchurch/banner_image.php?id=1 HTTP/1.1
Host localhost
User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer http://localhost/kincumberunitingchurch/index.php?sid=tgl9jq3f71nau3cj9vps6pna03
Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4
If-None-Match b98e0795b509be20146f58e06fbb624f
Cache-Control max-age=0

对于其他文件，服务器首先发送：

(Status-Line) HTTP/1.1 200 OK
Date Thu, 21 Jan 2010 08:55:25 GMT
Server Apache/2.2.11 (Win32) PHP/5.2.9-1
Last-Modified Wed, 30 Dec 2009 02:40:58 GMT
Etag "1000000013d35-40d9-47be9117f6280"
Accept-Ranges bytes
Content-Length 16601
Keep-Alive timeout=5, max=84
Connection Keep-Alive
Content-Type image/png

我的浏览器在下一次请求时发送以下内容：

(Request-Line) GET /kincumberunitingchurch/img/cbuttons.png HTTP/1.1
Host localhost
User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer http://localhost/kincumberunitingchurch/mystyle.css
Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4
If-Modified-Since Wed, 30 Dec 2009 02:40:58 GMT
If-None-Match "1000000013d35-40d9-47be9117f6280"
Cache-Control max-age=0

为什么它会发送If-Modified- send报头

Answer 1

您发送的第一个标头显示为"Last-Modfied"，这是一个拼写错误( Modified中的第一个'i‘丢失)。

Answer 2

您是否可以查看第一个示例中的Last-Modfied是否不是服务器端的拼写错误