确定中间件类Django中页面的内容类型
[英]Determine content-type of page in middleware class Django
问题描述
Well, I have middleware class which is required to determine content-type of rendered page and if it is 'txt/html', then do some action. 
好吧，我有一个中间件类，它需要确定呈现页面的内容类型，如果它是'txt / html'，则执行一些操作。 I've started just from seeing what content-types do I have on page and here is first problem I faced: 我只是从查看页面上有哪些内容类型开始的，这是我面临的第一个问题：
class StatsMiddleware(object):
def process_view(self, request, view_func, view_args, view_kwargs):
response = view_func(request, *view_args, **view_kwargs)
print response['Content-Type']
Executing this, I get few messages about content-types of page elements, like text/html , application/javascript and also tons of errors like key error: content-type and after that - broken pipe 执行此操作后，我收到一些有关页面元素的内容类型的消息，例如text/html ， application/javascript以及大量错误，例如key error: content-type及之后- broken pipe
So I assume that not all elements of page have such header Content-Type and my question is following: 因此，我假设并非页面的所有元素都具有此类标题Content-Type而我的问题如下：
Is there some general Content-Type that says 'That page is text/html' or there are a lot of content-types on page ? 是否有一些通用的Content-Type表示“该页面是text / html”，或者页面上有很多Content-Type？
And also if this is a proper way to deterimne content-type of page like this: 而且，如果这是确定像这样的页面内容类型的正确方法，则：
if response['Content-Type'] == 'text/html':
pass
2 个解决方案
解决方案1
1 已采纳 2014-12-12 09:38:59
I don't know why do you have those exceptions. 我不知道你为什么有这些例外。 According to django source code HttpResponse always have Content-Type. 根据Django源代码， HttpResponse始终具有Content-Type。 Default type sets in settings 设置中的默认类型设置
List of all mime-types you can find here . 您可以在此处找到所有mime类型的列表。 But I'm pretty sure that 'text/html' is what you need. 但是我很确定'text / html'是您所需要的。
You can also check type of response at first, and then check for content-type using .get() function to avoid unnecessary exceptions: 您还可以首先检查响应的类型，然后使用.get（）函数检查内容类型，以避免不必要的异常：
if isinstance(response, HttpResponse):
if response.get('Content-Type').count('text/html'):
response=big_magic(response)
return response
Some tests: 一些测试：
Python 3.4.2 (default, Oct 8 2014, 13:14:40)
[GCC 4.9.1] on linux
Django 1.7
>>> from django.http import response
>>> r = response.HttpResponse('some content')
>>> r['Content-Type']
'text/html; charset=utf-8'
>>> response.HttpResponseRedirect('/some/url')['Content-Type']
>>> response.HttpResponseRedirect('/some/url').get('Content-Type').count('text/html')
1
解决方案2
-1 2014-12-12 09:19:53
'text/html' or 'xml' is text files. “ text / html”或“ xml”是文本文件。 "Content-Type" is text in file. “内容类型”是文件中的文本。
<?xml version="1.0" encoding="UTF-8"?>
<note>
<to> Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
if "<?xml" in page then - xml else - html
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