addFeatures request

Question

I'm attempting to addFeatures in a .py script to an ArcGIS Server feature service. Can anyone spot an issue with the payload? My source code: queryURL_dalId = DALfs + "/addFeatures" params = urllib.urlencode({'f': 'json', 'features': json.dumps(feat), 'token': genTokenAGS()}) req = urllib2.Request(queryURL_dalId, params) response = urllib2.urlopen(req) jsonResultApp = json.load(response) print jsonResultApp #the result print is: #{u'error': {u'message': u'Unable to complete operation.', u'code': 500, u'details': [u'Parser error: Some parameters could not be recognized.']}}‍‍‍‍‍‍‍‍‍‍‍‍‍ The params "feature" attribute looks like this: { "geometry": { "rings": [ [ [ -8916035.78019179, 3084661.19599559 ], [ -8915988.0070495, 3085052.93576556 ], [ -8915529.38488079, 3085148.48205013 ], [ -8915424.28396684, 3084804.51542474 ], [ -8914889.22476772, 3084833.17930828 ], [ -8914593.03128233, 3084336.33862437 ], [ -8913924.20728573, 3084365.0025102 ], [ -8913859.51668594, 3083941.53976998 ], [ -8914444.27714894, 3083843.30241113 ], [ -8915008.00023389, 3083843.30241113 ], [ -8916035.78019179, 3084661.19599559 ] ] ] }, "attributes": { "activityLogId": "DAL-999", "scheduleId": "SCH-9", "agency": "blah" } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Thanks for looking!

JamesCrandall · Accepted Answer

It looks like the payload didn't contain "[" "]" brackets around the features parameter. I made that into a variable instead of setting directly from json.dumps(feat) and it seemed to work. paramFeatures = json.dumps(feat) params = urllib.urlencode({'f': 'json', 'features': paramFeatures, 'token': genTokenAGS()})‍‍‍‍