Rest API OAuth returns not Authorized error

[dhanuka1]

I managed to access the Rest Api with Basic authentication with username and password.

Now I am trying to access the Rest Api with OAuth.

I was referring to http://http//wiki.servicenow.com/index.php?title=Generating_OAuth_Tokens#API_Request_Parameters&gsc....

This is the format of the POST message,

Host: devxxxxx.service-now.com

Accept: application/json

Content-Type: application/json

Authorization: Basic YWRtaW46Q0BycjBsMTIz

Cache-Control: no-cache

Content-Type: application/x-www-form-urlencoded

Url Encoded body:

grant_type=password&client_id=xxxxxx&client_secret=xxxxxx&username=admin&username=xxxxxx

I tried both encoded body and body without encoding, it gives the same result.

Response

{

      "error": "server_error",

      "error_description": "access_denied"

}

Am I missing something here? Doesn't the "admin" user has privileges to perform this operation and acquire tokens?

[dhanuka1]

Also I forgot to mention that it's posting to /oauth_token.do endpoint.

POST /oauth_token.do HTTP/1.1

[dhanuka1 · Accepted solution]

Ok, two things,

1. Mistake,

grant_type=password&client_id=xxxxxx&client_secret=xxxxxx&username=admin&username=xxxxxx

SHOULD BE,

grant_type=password&client_id=xxxxxx&client_secret=xxxxxx&username=admin&password=xxxxxx

2. For this request you should not have the Authorization Header. I removed the Basic Authorization header. it's working now.

Recap,

Using POSTMAN,

Make sure the endpoint is "https://instance-now.com/oauth_token.do "

Headers:

Accept: application/json

Body (x-www-form-urlencoded)

grant_type : password

client_id: xxxxxx

client_secret: xxxxxxx

username: username_01

password: password_01

Hope this will help someone....

[jsubat]

Thanks, Dhanuka. That was enormously helpful.

[mahi4889Snow]

This is not working for AD/LDAP integrated credential, Please advice