HTTP PUT Call via REST API returning 200 code but empty response body

Jotinder Singh · ‎05-24-2021

I have created a Scripted REST API call with HTTP PUT Method. I am calling the endpoint from a python script in order to update an incident in SNOW from my external application.

When I make the PUT request from Postman, it is working fine and is updating the Incident. Hence I know my script is working fine and also the user has the required roles to update the incident.

However when I make the same call using my Python script, I get HTTP 200 but an empty response body and the incident is not updated. What am I possibly doing wrong? I tried playing around with header in my python script.

If I mention incorrect username / password in auth argument in my python script or if I mention incorrect content type in header, I do get a HTTP 401 response with proper error in the response body. However everything is correct and HTTP code is 200, I get empty response body with no updates happening.

Below is my Python requests snippet.

req_header = {"Content-Length": "230",
           "Accept-Encoding": "identity, deflate, compress, gzip",
           "Connection": "keep-alive",
           "Accept": "*/*",
           "User-Agent": "python-requests/0.11.1",
           "Content-Type": "application/json"
           }

API_ENDPOINT = "https://office_snow_instance.com/api/org/hear_clear_incoming_rest_api/updateincident"

data_json = {"SnowID": "IN21003453511",
             "Incident_short_description": "Updated incoming REST call for jotinderl",
             "assigned_to": "Jotinder Singh",
             "sys_id": "be66f8587bd03850198c42eddc4bcb5f"
        }
r = requests.put(url=API_ENDPOINT, data=data_json, auth=('POCuser ', 'XXXXXXXX'), headers=req_header)
print(r)
print(r.content)
return r.content

Note: masked some of the data in above code to maintain corporate security.

Roy Verrips · ‎05-24-2021

Hi Jotinder

It's a little hard (at least for me) to troubleshoot this with the information/snippets you've provided. I have questions such as why the endpoint isn't the table API, but a customer table (hear_clear_incoming_rest_api) as well as why you're using port 8080 (and in the one screenshot a reply from local 127.0.0.1)

Below is a snippet from my Personal Dev instance that works fine with Python using the standard ServiceNow Incident Table. Could it simply be that you didn't import the request handler package into Python? (line 2 - I don't see that in your snippet)

#Need to install requests package for python
import requests

# Set the request parameters - The last parameter is the SYSID of the incident 
url = 'https://devXXXXX.service-now.com/api/now/table/incident/ed92e8d173d023002728660c4cf6a7bc'

user = 'admin'
pwd = 'xxxxxxxx'

# Set proper headers
headers = {"Content-Type":"application/json","Accept":"application/json"}

# Do the HTTP request
response = requests.put(url, auth=(user, pwd), headers=headers ,data="{\"short_description\":\"Updated incoming REST call for jotinderl\",\"assigned_to\":\"77ad8176731313005754660c4cf6a7de\"}")

# Check for HTTP codes other than 200
if response.status_code != 200: 
    print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:',response.json())
    exit()

# Decode the JSON response into a dictionary and use the data
data = response.json()
print(data)

View solution in original post

Roy Verrips · ‎05-24-2021

Happy to hear you were able to resolve your python issue 🙂

Regarding desktop notifications: they are a built in feature, but may not be what you’re looking for. Here is a link to the docs to enable it - if that doesn’t help, I’d suggest to add another post to forum as a new topic. https://docs.servicenow.com/bundle/quebec-servicenow-platform/page/use/collaboration/task/t_EnableDisableConnectNotifications.html