File: txweb.py

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from twisted.web import resource

from scrapy.utils.py26 import json

class JsonResource(resource.Resource):

    json_encoder = json.JSONEncoder()

    def render(self, txrequest):
        r = resource.Resource.render(self, txrequest)
        return self.render_object(r, txrequest)

    def render_object(self, obj, txrequest):
        r = self.json_encoder.encode(obj) + "\n"
        txrequest.setHeader('Content-Type', 'application/json')
        txrequest.setHeader('Content-Length', len(r))
        return r