Django视图被调用两次（两次GET请求） [英] Django view getting called twice (double GET request)

问题描述

我正在Django中创建分类信息网站。单视图功能可处理全球清单，城市清单，仅易货全球清单和仅易货城市明智清单。此视图称为 ads 。

I'm creating a classifieds website in Django. A single view function handles global listings, city-wise listings, barter-only global listings and barter-only city-wise listings. This view is called ads.

网址格式按以下顺序编写（请注意，每个网址格式都有唯一的名称，尽管它与相同的 ads 视图绑定）：

The url patterns are written in the following order (note that each has a unique name although it's tied to the same ads view):

urlpatterns = patterns('',
    url(r'^buy_and_sell/$', ads,name='classified_listing'),
    url(r'^buy_and_sell/barter/$', ads,name='barter_classified_listing'),
    url(r'^buy_and_sell/barter/(?P<city>[\w.@+-]+)/$', ads,name='city_barter_classified_listing'),
    url(r'^buy_and_sell/(?P<city>[\w.@+-]+)/$', ads,name='city_classified_listing'),
)

问题是，当我点击上面列表中名为 classified_listing 的网址时，函数 ads 被称为两次。即这是我在终端上看到的内容：

The problem is that when I hit the url named classified_listing in the list above, the function ads gets called twice. I.e. here's what I see in my terminal:

[14/Jul/2017 14:31:08] "GET /buy_and_sell/ HTTP/1.1" 200 53758 
[14/Jul/2017 14:31:08] "GET /buy_and_sell/None/ HTTP/1.1" 200 32882

这意味着处理要加倍。我认为 urls.py 返回第一个匹配的URL模式。我做错了什么？解决此问题的最佳方法是什么？其余所有其他呼叫均按预期方式工作（即仅一次）。

This means double the processing. I thought urls.py returns the first url pattern matched. What am I doing wrong and what's the best way to fix this? All other calls work as expected btw (i.e. only once).

注意：如果我错过了一些东西，请询问更多信息。

了解此类事件的绝佳解释： https://groups.google.com/d/msg/django-users/CRMMYWix_60/KEIkguUcqxYJ

Great explanation to understand these type of occurences: https://groups.google.com/d/msg/django-users/CRMMYWix_60/KEIkguUcqxYJ

推荐答案

此问题与 urls.py 中的url模式如何排序无关。

This issue has nothing to do with how url patterns are ordered in urls.py.

就像在问题下的注释中指出的那样，这与HTML模板中有问题的资产引用有关。

Like pointed out in the comments under the question, this has to do with problematic asset references in the HTML template.

那是什么意思？

例如，尝试 curl -i http：// localhost：8000 / example />>终端中的output.txt 。然后在您选择的编辑器中打开 output.txt 。现在搜索 href 或 src 属性，其中值 None （或其他格式不正确的）。这就是创建双重通话的原因之一。那就是我的原因。我删除了这些，重复调用消失了。

For instance, try curl -i http://localhost:8000/example/ >> output.txt in your terminal. Then open up output.txt in your editor of choice. Now search for href or src attributes where values are None (or otherwise malformed). That's one reason a double call is being created. That was the reason for me. I removed these, and the double call disappeared.

这里有一个古老但很相关的文章，关于如何在您的计算机上全面诊断此问题： https://groups.google.com/forum/#!msg/django-users/ CRMMYWix_60 / KEIkguUcqxYJ

There's this old - but relevant - writeup about how to comprehensively diagnose this problem on your machine here: https://groups.google.com/forum/#!msg/django-users/CRMMYWix_60/KEIkguUcqxYJ

测试愉快。

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