我第一次使用flask-RESTful。在docs中它说：
使用reqparse模块还可以免费获得合理的错误消息。如果参数未能通过验证，Flask-RESTful将响应400 Bad Request和突出显示错误的响应。
但是在我的情况下，我得到一个异常AssertionError。
以下是代码：
#! /usr/bin/python
# -*- coding: UTF-8 -*-
from flask import Flask
from flask.ext.restful import Api, Resource, reqparse
class Test(Resource):
@staticmethod
def put(id):
parser = reqparse.RequestParser()
parser.add_argument('arg1')
parser.add_argument('arg2', type=int, help='helptext')
args = parser.parse_args()
return args, 200
app = Flask(__name__)
api = Api(app)
api.add_resource(Test, '/v1.0/test/<int:id>', endpoint='test')
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5001, debug=True)
当我使用正确的值测试时，它可以工作：
$ curl -i -H "Accept: application/json" -X PUT --data "arg1=ABC&arg2=1" http://192.0.0.7:5001/v1.0/test/1
HTTP/1.0 200 OK
Content-Type: application/json
Content-Length: 38
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 11:59:48 GMT
{
"arg1": "ABC",
"arg2": 1
}
但是，如果我为arg2设置了错误的值，而不是使用错误消息获取状态代码400，则会出现异常：
curl -i -H "Accept: application/json" -X PUT --data "arg1=ABC&arg2=A" http://192.0.0.7:5001/v1.0/test/1
HTTP/1.0 500 INTERNAL SERVER ERROR
Content-Type: text/html; charset=utf-8
Connection: close
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 12:04:25 GMT
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>AssertionError // Werkzeug Debugger</title>
<link rel="stylesheet" href="?__debugger__=yes&cmd=resource&f=style.css" type="text/css">
<script type="text/javascript" src="?__debugger__=yes&cmd=resource&f=jquery.js"></script>
<script type="text/javascript" src="?__debugger__=yes&cmd=resource&f=debugger.js"></script>
<script type="text/javascript">
var TRACEBACK = 27516816,
CONSOLE_MODE = false,
EVALEX = true,
SECRET = "uovVRKyVTy1b8gi5Yc3t";
</script>
</head>
<body>
<div class="debugger">
<h1>AssertionError</h1>
<div class="detail">
<p class="errormsg">AssertionError</p>
</div>
<h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
<div class="traceback">
<ul><li><div class="frame" id="frame-27516688">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
line <em class="line">1701</em>,
in <code class="function">__call__</code></h4>
<pre>return self.wsgi_app(environ, start_response)</pre>
</div>
<li><div class="frame" id="frame-139714215145552">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
line <em class="line">1689</em>,
in <code class="function">wsgi_app</code></h4>
<pre>response = self.make_response(self.handle_exception(e))</pre>
</div>
<li><div class="frame" id="frame-139714215148944">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
line <em class="line">271</em>,
in <code class="function">error_router</code></h4>
<pre>return original_handler(e)</pre>
</div>
<li><div class="frame" id="frame-139714215149072">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
line <em class="line">268</em>,
in <code class="function">error_router</code></h4>
<pre>return self.handle_error(e)</pre>
</div>
<li><div class="frame" id="frame-139714215149136">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
line <em class="line">1687</em>,
in <code class="function">wsgi_app</code></h4>
<pre>response = self.full_dispatch_request()</pre>
</div>
<li><div class="frame" id="frame-139714215149008">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
line <em class="line">1360</em>,
in <code class="function">full_dispatch_request</code></h4>
<pre>rv = self.handle_user_exception(e)</pre>
</div>
<li><div class="frame" id="frame-139714215149200">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
line <em class="line">271</em>,
in <code class="function">error_router</code></h4>
<pre>return original_handler(e)</pre>
</div>
<li><div class="frame" id="frame-139714215149264">
<h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
line <em class="line">1246</em>,
in <code class="function">handle_user_exception</code></h4>
<pre>assert exc_value is e</pre>
</div>
</ul>
<blockquote>AssertionError</blockquote>
</div>
<div class="plain">
<form action="http://paste.pocoo.org/" method="post">
<p>
<input type="hidden" name="language" value="pytb">
This is the Copy/Paste friendly version of the traceback. <span
class="pastemessage">You can also paste this traceback into LodgeIt:
<input type="submit" value="create paste"></span>
</p>
<textarea cols="50" rows="10" name="code" readonly>Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 268, in error_router
return self.handle_error(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1246, in handle_user_exception
assert exc_value is e
AssertionError</textarea>
</form>
</div>
<div class="explanation">
The debugger caught an exception in your WSGI application. You can now
look at the traceback which led to the error. <span class="nojavascript">
If you enable JavaScript you can also use additional features such as code
execution (if the evalex feature is enabled), automatic pasting of the
exceptions and much more.</span>
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<div class="footer">
Brought to you by <strong class="arthur">DON'T PANIC</strong>, your
friendly Werkzeug powered traceback interpreter.
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</body>
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<!--
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 268, in error_router
return self.handle_error(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1246, in handle_user_exception
assert exc_value is e
AssertionError
-->
这一切都在带有
的Centos 6.5上运行编辑：如果我使用debug=False运行服务器，我会得到：
$ curl -i -H "Accept: application/json" -X PUT --data "arg1=ABC&arg2=A" http://192.0.0.7:5001/v1.0/test/1
HTTP/1.0 500 INTERNAL SERVER ERROR
Content-Type: application/json
Content-Length: 37
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 12:50:37 GMT
{"message": "Internal Server Error"}
答案 0 :(得分：0)
升级烧瓶至0.10.1，问题消失。