使用 Flask，如何修改所有输出的 Cache-Control 标头? [英] Using Flask, how do I modify the Cache-Control header for ALL output?

问题描述

我试过用这个

@app.after_request
def add_header(response):
    response.headers['Cache-Control'] = 'max-age=300'
    return response

但这会导致出现重复的 Cache-Control 标头.我只想要 max-age=300，而不是 max-age=1209600 行！

But this causes a duplicate Cache-Control header to appear. I only want max-age=300, NOT the max-age=1209600 line!

$ curl -I http://my.url.here/
HTTP/1.1 200 OK
Date: Wed, 16 Apr 2014 14:24:22 GMT
Server: Apache
Cache-Control: max-age=300
Content-Length: 107993
Cache-Control: max-age=1209600
Expires: Wed, 30 Apr 2014 14:24:22 GMT
Content-Type: text/html; charset=utf-8

推荐答案

使用 response.cache_control 对象;这是一个 ResponseCacheControl() 实例让您直接设置各种缓存属性.此外，如果已经有一个标题，它会确保不添加重复的标题.

Use the response.cache_control object; this is a ResponseCacheControl() instance letting you set various cache attributes directly. Moreover, it'll make sure not to add duplicate headers if there is one there already.

@app.after_request
def add_header(response):
    response.cache_control.max_age = 300
    return response

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