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[英]Requests.get('url') is returning TypeError super(type, obj): obj must be an instance or subtype of type
[英]TypeError: expected httplib.Message, got <type 'instance'>. when using requests.get(url) on GAE
我的目標是構建一個Web爬蟲並在GAE上托管它。 但是,當我嘗試執行一個非常基本的實現時,我收到以下錯誤:
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1102, in __call__
return handler.dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "E:\WSE_NewsClusteriing\crawler\crawler.py", line 14, in get
source_code = requests.get(url)
File "libs\requests\api.py", line 67, in get
return request('get', url, params=params, **kwargs)
File "libs\requests\api.py", line 53, in request
return session.request(method=method, url=url, **kwargs)
File "libs\requests\sessions.py", line 468, in request
resp = self.send(prep, **send_kwargs)
File "libs\requests\sessions.py", line 576, in send
r = adapter.send(request, **kwargs)
File "libs\requests\adapters.py", line 376, in send
timeout=timeout
File "libs\requests\packages\urllib3\connectionpool.py", line 559, in urlopen
body=body, headers=headers)
File "libs\requests\packages\urllib3\connectionpool.py", line 390, in _make_request
assert_header_parsing(httplib_response.msg)
File "libs\requests\packages\urllib3\util\response.py", line 49, in assert_header_parsing
type(headers)))
TypeError: expected httplib.Message, got <type 'instance'>.
我的main.py如下:
import sys
sys.path.insert(0, 'libs')
import webapp2
import requests
from bs4 import BeautifulSoup
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.headers['Content-Type'] = 'text/plain'
url = 'http://www.bbc.com/news/world'
source_code = requests.get(url)
plain_text = source_code.text
soup = BeautifulSoup(plain_text)
for link in soup.findAll('a', {'class': 'title-link'}):
href = 'http://www.bbc.com' + link.get('href')
self.response.write(href)
app = webapp2.WSGIApplication([
('/', MainPage),
], debug=True)
問題是爬蟲作為一個獨立的python應用程序工作正常。
有人能幫我弄清楚這里有什么問題嗎? 請求模塊是否會導致與GAE的一些兼容性問題?
我建議暫時不要在App Engine上使用requests
庫,因為它沒有得到官方支持。 因此很可能遇到兼容性問題。 根據URL Fetch Python API文章,支持的庫包括urllib
, urllib2
, httplib
和直接使用urlfetch
。 requests
庫的某些功能也可能基於urllib3
庫,因為它們的協作 。 此庫尚不支持。
有關urllib2
和urlfetch
請求的簡單示例,請隨時查閱URL Fetch 。 如果這些圖書館不適合您的某種方式,請隨時在您的問題中指出我們。
這是近兩年的問題,但我實際上偶然發現了這個問題。 為了那些可能遇到類似問題的人的利益,docs描述了如何發出HTTP(S)請求
import requests
import requests_toolbelt.adapters.appengine
# Use the App Engine Requests adapter. This makes sure that Requests uses
# URLFetch.
requests_toolbelt.adapters.appengine.monkeypatch()
Referance https://cloud.google.com/appengine/docs/standard/python/issue-requests
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