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Response

Status Code

After sending a request, you will receive a response, including a status code, response header, and response body.

A status code is a group of digits, ranging from 1xx to 5xx. It indicates the status of a request. For more information, see Status Codes.

If status code 201 is returned for the calling of the IAM API used to obtain a user token, the request is successful.

Response Header

Similar to a request, a response also has a header, for example, Content-Type. Table 1 list the response header parameters.

Table 1 Response header parameters

Parameter

Description

Content-Length

Specifies the length (in bytes) of the response body.

Date

Specifies the time when a response is returned.

Content-type

Specifies the MIME type of the response body.

TraceID

Specifies the ID returned by the request, facilitating fault locating.

Figure 1 shows the response header fields for the IAM API used to obtain a user token. The x-subject-token header field is the desired user token. This token can then be used to authenticate the calling of other APIs.

Figure 1 Header fields of the response to the request for obtaining a user token

Response Body

The body of a response is often returned in structured format as specified in the Content-Type header field. The response body transfers content except the response header.

The following is part of the response body for the API used to obtain a user token.

{
    "token": {
        "expires_at": "2019-02-13T06:52:13.855000Z",
        "methods": [
            "password"
        ],
        "catalog": [
            {
                "endpoints": [
                    {
                        "region_id": "cn-north-1",
                        ......

If an error occurs during API calling, an error code and a message will be displayed. The following shows an error response body.

{
    "error_msg": "The format of message is error",
    "error_code": "AS.0001"
}

In the response body, error_code is an error code, and error_msg provides information about the error.

Parent topic: Calling APIs