在Flask中禁用缓存 [英] Disabling caching in Flask

问题描述

我有一些缓存问题。我正在运行一个很小的Web应用程序，该应用程序将读取一帧并将其保存到磁盘，然后在浏览器窗口中显示。

I have some caching issues. I'm running very small web-application which reads one frame, saves it to the disk and then shows it in browsers window.

我知道，可能不是最好的解决方案，但是每次我用相同的名称保存此读取的框架，因此任何浏览器都将其缓存。

I know, it is probably not the best solution, but every time I save this read frame with the same name and therefor any browser will cache it.

我尝试使用html元标记-没有成功：

I tried to use html meta-tags - no success:

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

此外，我也尝试过此操作（特定于烧瓶）：

Also, I have tried this one (flask-specific):

resp.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
resp.headers["Pragma"] = "no-cache"
resp.headers["Expires"] = "0"

这是我尝试修改 resp 标头的方式：

This is how I tried to modify resp headers:

r = make_response(render_template('video.html', video_info=video_info))

r.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
r.headers["Pragma"] = "no-cache"
r.headers["Expires"] = "0"

仍然Google Chrome和Safari都可以缓存。

Still both Google Chrome and Safari do caching.

这里可能是什么问题？

推荐答案

好，

最后，它可以这样工作：

finally it worked with this:

@app.after_request
def add_header(r):
    """
    Add headers to both force latest IE rendering engine or Chrome Frame,
    and also to cache the rendered page for 10 minutes.
    """
    r.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
    r.headers["Pragma"] = "no-cache"
    r.headers["Expires"] = "0"
    r.headers['Cache-Control'] = 'public, max-age=0'
    return r

如果添加此功能，则每次请求完成后都会调用此函数，请参见此处

If you add this, this function will called after each request done. Please,see here

I会高兴的是，如果有人能解释我为什么页处理程序中的标头覆盖无法正常工作？

I would be happy, if anyone could explain me why this headers overwriting did not work from the page handler?

谢谢。

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