3

我正在开发一个 django 应用程序，它从 facebook graph api 获取数据并绘制它的网络图。该应用程序在本地运行良好，但是No JSON object could be decoded当我在pythonanywhere上托管它时出现错误。另外，作为 pythonanywhere 的新手，我不知道如何在控制台上打印错误。

这是代码：

import urllib,json
from django.shortcuts import render
from main.forms import InputForm
from django.http import HttpResponseRedirect

def main(request):
    if request.method == 'POST': # If the form has been submitted
        input_form = InputForm(request.POST)
        if input_form.is_valid():
            cd = input_form.cleaned_data
            actoken = cd['access_token']
            keyword = cd['keyword']
            url = "https://graph.facebook.com/search?q="+keyword+"&type=post&fields=likes.fields(name).limit(10),comments,message&limit=5&access_token="+actoken
            fetch = urllib.urlopen(url).read()
            print fetch # don't know the response
            data = json.loads(fetch)
            return HttpResponseRedirect('/graph/')
        else:
            input_form = InputForm(request.POST)
            return render(request, 'index.html', {
                'input_form': input_form,
            })
    else:
        input_form = InputForm()
        return render(request, 'index.html', {
            'input_form': input_form,
        })

这是堆栈跟踪：

追溯：

File "/home/architv/.virtualenvs/django16/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/architv/fb-network-graph/fbnetworkgraph/main/views.py" in main
  15.             data = simplejson.loads(fetch)
File "/usr/lib/python2.7/json/__init__.py" in loads
  338.         return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py" in decode
  365.         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py" in raw_decode
  383.             raise ValueError("No JSON object could be decoded")

Exception Type: ValueError at /main/
Exception Value: No JSON object could be decoded

编辑： 我按照 glenn 的建议浏览了服务器日志文件，发现了这个：

2014-04-05 09:22:22 https://graph.facebook.com/search?q=ukraine&type=post&fields=likes.fields(name).limit(10),comments,message&limit=5&access_token=CAACEdEose0cBAIhZBJSXHTHOoGZCFZC2xbPDNuNKX9NIksZBMQudtzN2A7o4op5ZBkOhYTZAS6JFcn5lQMNY94nhntZAhmA4DZAWuVg0wqHVHI3VQToq9yhHeQZBL75BgaPMNIbUj9XKQ7ICKJeM3R5YAShXjBxPZAcmbfmxcARFQZA0UjartHP3lWpWCR2wRjJ8WwZD
2014-04-05 09:22:22 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>ERROR: The requested URL could not be retrieved</title> <style type="text/css"><!--   /*#012 Stylesheet for Squid Error pages#012 Adapted from design by Free CSS Templates#012 http://www.freecsstemplates.org#012 Released for free under a Creative Commons Attribution 2.5 License#012*/#012#012/* Page basics */#012* {#012#011font-family: verdana, sans-serif;#012}#012#012html body {#012#011margin: 0;#012#011padding: 0;#012#011background: #efefef;#012#011font-size: 12px;#012#011color: #1e1e1e;#012}#012#012/* Page displayed title area */#012#titles {#012#011margin-left: 15px;#012#011padding: 10px;#012#011padding-left: 100px;#012#011background: url('http://www.squid-cache.org/Artwork/SN.png') no-repeat left;#012}#012#012/* initial title */#012#titles h1 {#012#011color: #000000;#012}#012#titles h2 {#012#011color: #000000;#012}#012#012/* special event: FTP success page titles */#012#titles ftpsuccess {#012#011backgro
2014-04-05 09:22:22   body :lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; } :lang(he) { direction: rtl; }  --></style> </head><body id=ERR_UNSUP_REQ> <div id="titles"> <h1>ERROR</h1> <h2>The requested URL could not be retrieved</h2> </div> <hr>  <div id="content"> <p>The following error was encountered while trying to retrieve the URL: <a href="https://graph.facebook.com/search?">https://graph.facebook.com/search?</a></p>  <blockquote id="error"> <p><b>Unsupported Request Method and Protocol</b></p> </blockquote>  <p>Squid does not support all request methods for all access protocols. For example, you can not POST a Gopher request.</p>  <p>Your cache administrator is <a href="mailto:webmaster?subject=CacheErrorInfo%20-%20ERR_UNSUP_REQ&amp;body=CacheHost%3A%20glenn-liveproxy1%0D%0AErrPage%3A%20ERR_UNSUP_REQ%0D%0AErr%3A%20%5Bnone%5D%0D%0ATimeStamp%3A%20Sat,%2005%20Apr%202014%2009%3A21%3A47%20GMT%0D%0A%0D%
4

3 回答 3

3

一些 Python url 库与我们用来过滤免费帐户 Internet 访问的 squid 代理之间存在不兼容。

尝试使用请求（我相信该错误已修复）或 urllib3 而不是 urllib。

于 2014-04-05T15:51:49.817 回答
2

初级，您无法通过 Squid 配置访问 Facebook，而是要获取 JSON 流，您会得到一个 HTML Squid 错误页面。就这样。

于 2014-04-05T14:26:14.277 回答
0

这似乎是基本 PythonAnywhere 帐户的限制：

我怀疑您不能通过 HTTPS 进行 POST。通过代理服务器连接时有很多限制。错误消息来自代理，看起来很清楚。

黑客帐户具有不受限制的互联网访问权限，根本不通过代理服务。

...

除非您有付费帐户，否则无法绕过代理，这是正确的。您可以毫无风险地升级您的帐户并对其进行测试 - 如果您发现它不起作用并且您在 30 天内再次降级，您可以要求全额退款第一个月的费用。

于 2014-04-05T15:27:55.803 回答