浏览器不是在HTTPS中缓存图像（HTTP工作正常）。 即使使用Cache-Control：public

Question

I'm trying to follow Google's caching recommendation , but neither IE nor Chrome are caching my images when HTTPS is used. The second request is not even a conditional GET. If I simply switch to HTTP, it works fine.

Here's request information, according to Chrome's request logger:

Remote Address: ::1:443
Request URL: https://localhost/getmyimage.php?id=123
Request Method: GET
Status Code: 200 OK

Request Headers

Accept: image/webp,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en;q=0.8
Connection: keep-alive
Cookie: PHPSESSID=gbk4vk7ejlr20nqgajcqgskul7
Host: localhost
Referer: https://localhost/
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36

Query String Parameters

id: 123

Response Headers

Cache-Control: public
Connection: Keep-Alive
Content-Length: 3224
Content-Type: image/png
Date: Tue, 27 May 2014 06:53:03 GMT
Expires: Mon, 25 Aug 2014 06:53:03 GMT
Keep-Alive: timeout=5, max=99
Last-Modified: Mon, 24 Feb 2014 02:17:21 GMT
Server: Apache/2.4.7 (Win32) OpenSSL/1.0.1e PHP/5.5.9
X-Powered-By: PHP/5.5.9

Answer 1

i think this is happening because of the url format, you can use apache's mod_rewrite to make a url format for images given by this script to look like localhost/image/123.png

EDIT

after reading your comment, i can say that it's not about your server's config, you can't do anything about it according to this and this because of HTTPS implementations since you have Cache-control: public set already.