使用Flask,我如何修改所有输出的Cache-Control头? [英] Using Flask, how do I modify the Cache-Control header for ALL output?
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问题描述
I tried using this
@app.after_request
def add_header(response):
response.headers['Cache-Control'] = 'max-age=300'
return response
<但是这会导致重复的Cache-Control头出现。我只想要max-age = 300,而不是max-age = 1209600 line!
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
object 对象;这是一个 ResponseCacheControl()
实例,让你直接设置各种缓存属性。而且,如果已经存在的话,它将确保不添加重复的标题。
Use the response.cache_control
object 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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