处理[Errno 111]连接被烧瓶中的请求拒绝返回

Question

我有用java开发的后端，它可以进行各种处理。我的前端是使用python的瓶颈框架开发的。我正在使用requests发送请求并获得java中apis的响应。

以下是我的代码确实该行：

req = requests.post(buildApiUrl.getUrl('user') + "/login", data=payload) 

我的问题是，有时，当Tomcat实例未运行或存在某些问题的Java API，我总是从请求错误如下：

ERROR:root:HTTPConnectionPool(host='localhost', port=8080): Max retries exceeded with url: /MYAPP/V1.0/user/login (Caused by <class 'socket.error'>: [Errno 111] Connection refused) 
Traceback (most recent call last): 
    File "/home/rahul/git/myapp/webapp/views/utils.py", line 31, in decorated_view 
    return_value = func(*args, **kwargs) 
    File "/home/rahul/git/myapp/webapp/views/public.py", line 37, in login 
    req = requests.post(buildApiUrl.getUrl('user') + "/login", data=payload) 
    File "/home/rahul/git/myapp/venv/local/lib/python2.7/site-packages/requests/api.py", line 88, in post 
    return request('post', url, data=data, **kwargs) 
    File "/home/rahul/git/myapp/venv/local/lib/python2.7/site-packages/requests/api.py", line 44, in request 
    return session.request(method=method, url=url, **kwargs) 
    File "/home/rahul/git/myapp/venv/local/lib/python2.7/site-packages/requests/sessions.py", line 335, in request 
    resp = self.send(prep, **send_kwargs) 
    File "/home/rahul/git/myapp/venv/local/lib/python2.7/site-packages/requests/sessions.py", line 438, in send 
    r = adapter.send(request, **kwargs) 
    File "/home/rahul/git/myapp/venv/local/lib/python2.7/site-packages/requests/adapters.py", line 327, in send 
    raise ConnectionError(e) 
ConnectionError: HTTPConnectionPool(host='localhost', port=8080): Max retries exceeded with url: /MYAPP/V1.0/user/login (Caused by <class 'socket.error'>: [Errno 111] Connection refused) 

我要处理，我接受我的烧瓶应用程序错误等情况，这样我可以给网页，而不是显示空白屏幕上进行必要的回应。那么我怎么能做到这一点？异常request.post提出使用try-except

Answer 1

陷阱：

try: 
    req = requests.post(buildApiUrl.getUrl('user') + "/login", data=payload) 
except requests.exceptions.RequestException: 
    # Handle exception ..