我似乎无法在Flask 0.10.1中产生异常响应(同样的情况发生在0.9).这段代码:
from flask import Flask,jsonify from werkzeug.exceptions import HTTPException import flask,werkzeug print 'Flask version: %s' % flask.__version__ print 'Werkzeug version: %s' % werkzeug.__version__ app = Flask(__name__) app.config['PROPAGATE_EXCEPTIONS'] = True class JSONException(HTTPException): response = None def get_body(self,environ): return jsonify(a=1) def get_headers(self,environ): return [('Content-Type','application/json')] @app.route('/x') def x(): return jsonify(a=1) @app.route('/y') def y(): raise JSONException() c = app.test_client() r = c.get('x') print r.data r = c.get('y') print r.data
版画
Flask version: 0.10.1 Werkzeug version: 0.9.4 { "a": 1 } Traceback (most recent call last): File "flask_error.py",line 33,in <module> print r.data File "/home/path/lib/python2.7/site-packages/werkzeug/wrappers.py",line 881,in get_data self._ensure_sequence() File "/home/path/lib/python2.7/site-packages/werkzeug/wrappers.py",line 938,in _ensure_sequence self.make_sequence() File "/home/path/lib/python2.7/site-packages/werkzeug/wrappers.py",line 953,in make_sequence self.response = list(self.iter_encoded()) File "/home/path/lib/python2.7/site-packages/werkzeug/wrappers.py",line 81,in _iter_encoded for item in iterable: File "/home/path/lib/python2.7/site-packages/werkzeug/wsgi.py",line 682,in __next__ return self._next() File "/home/path/lib/python2.7/site-packages/werkzeug/wrappers.py",in _iter_encoded for item in iterable: TypeError: 'Response' object is not iterable
回溯是意外的.
解决方法
jsonify()生成一个完整的响应对象,而不是一个响应体,所以使用
HTTPException.get_response()
,而不是.get_body():
class JSONException(HTTPException): def get_response(self,environ): return jsonify(a=1)
class JSONException(HTTPException): def get_body(self,environ): return json.dumps({a: 1}) def get_headers(self,'application/json')]
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