How Do I Obtain a User Token Using Postman?

Postman is a visual editing tool for building and testing API requests. It provides an easy-to-use user interface to send HTTP requests, including GET, PUT, POST, and DELETE requests. Postman allows you to modify parameters of HTTP requests and returns response to your requests.

A token is a user's access credential, which includes user identities and permissions. When you call an API to access cloud resources, a token is required for identity authentication.

Perform the procedure described in this section to obtain a user token using Postman. For details about the parameters, see Obtaining a User Token.

Prerequisites

You have installed and registered with Postman.

Procedure

Edit the request URL, header, and body of the API used to obtain a token for calling APIs.
- Request URL
  The request URL is in the format https://IAM region and endpoint/API URI.
  1. Obtain the IAM region and endpoint from Regions and Endpoints.
    Currently, NLP Fundamentals, language generation, language understanding, and machine translation APIs are available in the CN North-Beijing4 region.
    Figure 1 IAM regions and endpoints
  2. Obtain the API URI from Obtaining a User Token.
    For example, the request URL in the ap-southeast-3 region is https://iam.ap-southeast-3.myhwclouds.com/v3/auth/tokens.
  3. Select an API request method and enter the request URL in Postman.
- Request Header
  Set key to Content-Type and value to application/json;charset=utf8.
- Request Body
  Modify parameters in the example request body.
```
{
	"auth": {
		"identity": {
			"methods": [
                                "password"
                         ],
			"password": {
				"user": {
					"domain": {
						"name": "Account name"
					},
					"name": "IAM user name",
					"password": "IAM user password"
				}
			}
		},
		"scope": {
			"domain": {
						"name": "Account name"
			}
		}
	}
  }
```
  For details, see Obtaining Account, IAM User, and Project Information.
  If no IAM user is created, use the administrator account to create an IAM user and configure a password for it. For details, see Creating an IAM User.
  
  Third-party system users can set a password by clicking Forgot Password on the login page.
Click Send to send the API request.
View the token in the response header. When you call other IAM APIs, you can use this token for authentication.
- The validity period of a token is 24 hours. If you want to use a token for authentication, cache it to avoid frequently calling the IAM API.
- If an error code, for example 401, is returned, the authentication fails. Confirm that parameters in the request body are correct and send the request again.
- If "Header Overflow" is displayed, resolve the problem by referring to Solution.

Solution

We have found that Postman of V7.25.0, V7.26.0, or later cannot be used to obtain a user token due to configurations. The message "Header Overflow" will be displayed if you use any of these versions.

Method 1
Use an earlier version of Postman, such as V5.xx.

Method 2:

Run the following curl command to obtain a token and replace the text in bold with actual values:

curl -ik -X POST -H 'Content-Type=application/json;charset=utf8' -d '{"auth": {"identity": {"methods": ["password"],"password": {"user": {"domain": {"name": "Account name"},"name": "IAM user name","password": "IAM user password"}},},"scope": {"domain": {"name": "Account name"}}}}' https://iam.ap-southeast-1.myhuaweicloud.com/v3/auth/tokens

Method 3

Pass an additional environment variable NODE_OPTIONS=--max-http-header-size=16384 (16KB) to Postman to specify the maximum size of the HTTP header (in bytes).

Run one of the following commands depending on your OS:

macOS

NODE_OPTIONS=--max-http-header-size=16384 /Applications/Postman.app/Contents/MacOS/Postman

Linux

NODE_OPTIONS=--max-http-header-size=16384 /path/to/Postman/Postman

Windows

set NODE_OPTIONS=--max-http-header-size=16384 
C:\users\<username>\AppData\local\Postman\Postman.exe

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How Do I Obtain a User Token Using Postman?

Prerequisites

Procedure

Solution

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