C# Client to Consume Google App Engine RESTful Webservice (rpc XML)
- by Ngu Soon Hui
I think I hit a problem when using C# client to consume Google App Engine Webservice. The Google App Engine code I use is here. This is how the python script on server would look like:
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
import logging
from StringIO import StringIO
import traceback
import xmlrpclib
from xmlrpcserver import XmlRpcServer
class Application:
def __init__(self):
pass
def getName(self,meta):
return 'example'
class XMLRpcHandler(webapp.RequestHandler):
rpcserver = None
def __init__(self):
self.rpcserver = XmlRpcServer()
app = Application()
self.rpcserver.register_class('app',app)
def post(self):
request = StringIO(self.request.body)
request.seek(0)
response = StringIO()
try:
self.rpcserver.execute(request, response, None)
except Exception, e:
logging.error('Error executing: '+str(e))
for line in traceback.format_exc().split('\n'):
logging.error(line)
finally:
response.seek(0)
rstr = response.read()
self.response.headers['Content-type'] = 'text/xml'
self.response.headers['Content-length'] = "%d"%len(rstr)
self.response.out.write(rstr)
application = webapp.WSGIApplication(
[('/xmlrpc/', XMLRpcHandler)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
The client side ( in Python) is this:
import xmlrpclib
s = xmlrpclib.Server('http://localhost:8080/xmlrpc/')
print s.app.getName()
I have no problem in using Python client to retrieve values from Google App Engine, but I do have difficulties in using a C# client to retrieve the values. The error I got was 404 method not found when I am trying to GetResponse from the web request.
This is my code
var request = (HttpWebRequest)WebRequest.Create("http://localhost:8080/xmlrpc/app");
request.Method = "GET";
request.ContentLength = 0;
request.ContentType = "text/xml";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) //404 method not found error here.
{
}
I think it must be that the url is wrong, but I don't know how to get it right. Any idea?
