WSGI - Set content type to JSON

Question

I'm crazy green to WSGI on Google App Engine (GAE).

How do I set the content type to JSON? This is what I have so far:

class Instructions(webapp.RequestHandler):
    def get(self):
        response = {}
        response["message"] = "This is an instruction object"

        self.response.out.write(json.dumps(response))



application = webapp.WSGIApplication([('/instructions', Instructions)],
                                     debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

Additionally, I'm building a few RESTful services, nothing too complicated. I was using restlets when I was developing in JAVA. Is there a better framework to be using than WSGI? The only reason I'm using WSGI is because that was what they used in the App Engine tutorial.

Thanks!

Answer 1

You can set the proper Content-Type with something like this:

self.response.headers['Content-Type'] = "application/json"
self.response.out.write(json.dumps(response))

WSGI is not a framework but a specification; the framework you are currently using is the webapp framework.

There's nothing sophisticated and specific like Restlet on the Python side; however with webapp you can create RESTful request handlers through regular expressions returning JSON/XML data like your handler does.

Answer 2

Like any HTTP response, you can add or edit headers:

def get(self):
    response = {}
    response["message"] = "This is an instruction object"

    self.response.headers["Content-Type"] = "application/json"
    self.response.out.write(json.dumps(response))

More here: Redirects, Headers and Status Codes