PNG图像输出的标题以确保它在浏览器中被缓存?
我有动态生成的图像 (PNG)，并将嵌入网站和论坛.当图像发布在非常繁忙的页面上时，会有很多连接来为不经常更改的内容提供服务.我想告诉浏览器缓存多长时间.
I have images (PNG) that are generated dynamically and will be embedded in websites and forums. When an image gets posted on a very busy page, there are a lot many connections to service for something that doesn't change often. I want to tell the browser for how long to cache it.
那么我需要什么标题?目前，我有:
So what headers do I need? Currently, I have:
Cache-Control: max-age=86400
Content-Type: image/png
浏览器似乎没有缓存图像(大约 20-30kb).还需要什么?
It seems that the browser is not caching the image (it is about 20-30kb). What else would be necessary?
这是一个示例图像，我已经有一个带有 .png 扩展名的 URL:https://images.carspending.com/sigimg/5734/user/honda-accord-2-4i-executive-tourer_medium.png
This is an example image, I already have an URL with .png extension:
https://images.carspending.com/sigimg/5734/user/honda-accord-2-4i-executive-tourer_medium.png
推荐答案
最后成功的是:
header('Pragma: public');
header('Cache-Control: max-age=86400');
header('Expires: '. gmdate('D, d M Y H:i:s GMT', time() + 86400));
header('Content-Type: image/png');
现在浏览器在加载带有嵌入的页面时不会请求图像.
Now the browser does not make requests for the image when loading a page with embeded one.
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