python – Flask：’Response’对象不能与响应生成异常一起迭代

概述我似乎无法在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, jsonifyfrom werkzeug.exceptions import HTTPExceptionimport flask, werkzeugprint 'Flask version: %s' % flask.__version__print 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,Jsonifyfrom werkzeug.exceptions import httpExceptionimport flask,werkzeugprint 'Flask version: %s' % flask.__version__print 'Werkzeug version: %s' % werkzeug.__version__app = Flask(__name__)app.config['PROPAGATE_EXCEPTIONS'] = Trueclass 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.datar = c.get('y')print r.data

版画

Flask version: 0.10.1Werkzeug 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)

另一种方法是只使用Json.dumps()来生成一个体：

class JsONException(httpException):    def get_body(self,environ):        return Json.dumps({a: 1})    def get_headers(self,'application/Json')]

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