Making an API Request

Request URI

A request URI is in the following format:

{URI-scheme} :// {Endpoint} / {resource-path} ? {query-string}

Although a request URI is included in the request header, most programming languages or frameworks require the request URI to be transmitted separately.

• URI-scheme: Protocol used to transmit requests. All APIs use HTTPS.
• Endpoint: domain name or IP address of the server bearing the REST service. The endpoint varies between services in different regions. It can be obtained from Regions and Endpoints. For example, the endpoint of IAM in CN-Hong Kong is iam.ap-southeast-1.myhwcloud.com.
• resource-path: Access path of an API for performing a specified operation. Obtain the value from the URI of an API. For example, resource-path of the API for creating an IAM user is /v3.0/OS-USER/users.
• query-string: Query parameter, which is optional. Ensure that a question mark (?) is included before each query parameter that is in the format of "Parameter name=Parameter value". For example, ? limit=10 indicates that a maximum of 10 data records will be displayed.

For example, you need to create an IAM user. Since IAM is a global service, use the endpoint of any region (for example, iam.ap-southeast-1.myhwcloud.com of CN-Hong Kong) and obtain resource-path (/v3.0/OS-USER/users) in the URI of the API for creating an IAM user as an administrator. Then, construct the request as follows:

https://iam.ap-southeast-1.myhuaweicloud.com/v3.0/OS-USER/users

Figure 1 Example URI

To simplify the URI display in this document, each API is provided only with a resource-path and a request method. The URI-scheme of all APIs is HTTPS, and the endpoints of all APIs in the same region are identical.

Request Methods

HTTP-based request methods, which are also called operations or actions, indicate the type of operations the service is requesting.

• GET: requests the server to return specified resources.
• PUT: requests the server to update specified resources.
• POST: requests the server to add resources or perform special operations.
• DELETE: requests the server to delete specified resources, for example, an object.
• HEAD: requests a server resource header.
• PATCH: requests the server to update partial content of a specified resource. If the resource does not exist, a new resource will be created. If the resource is unavailable, the PATCH method is used to create a resource.

For example, in the URI of the API for creating an IAM user as an administrator, the request method is POST. The request is as follows:

POST https://iam.ap-southeast-1.myhuaweicloud.com/v3.0/OS-USER/users

Request Header

You can also add additional header fields to a request, such as the fields required by a specified URI or HTTP method. For example, to request for the authentication information, add Content-Type, which specifies the request body type.

Common request header fields are as follows:

• Content-Type: specifies the request body type or format. This field is mandatory and its default value is application/json;charset=utf8. Other values of this field will be provided for specific APIs if any.
• Authorization: signature authentication information. This field is optional. When AK/SK-based authentication is enabled, this field is automatically specified when SDK is used to sign the request. For details, see AK/SK-based Authentication.
• X-Sdk-Date: time when a request is sent. This field is optional. When AK/SK-based authentication is enabled, this field is automatically specified when SDK is used to sign the request. For details, see AK/SK-based Authentication.
• X-Auth-Token: specifies a user token only for token-based API authentication. The user token is a response to the API for obtaining a user token. This API is the only one that does not require authentication.

• X-Project-ID: specifies a subproject ID. This parameter is optional and can be used in multi-project scenarios. The X-Project-ID field is mandatory in the request header for accessing resources in a subproject through AK/SK-based authentication.
• X-Domain-ID: account ID, which is optional. When you call APIs of global services using AK/SK-based authentication, X-Domain-ID needs to be configured in the request header.

For the API for creating an IAM user as an administrator, if AK/SK-based authentication is enabled, the request with the header is as follows:

POST https://iam.ap-southeast-1.myhuaweicloud.com/v3.0/OS-USER/users
Content-Type: application/json 
X-Sdk-Date: 20240416T095341Z 
Authorization: SDK-HMAC-SHA256 Access=****************, SignedHeaders=content-type;host;x-sdk-date, Signature=****************

Request Body

A request body is generally sent in structured format. It corresponds to Content-Type in the request header and transfers content except the request header. If the request body needs to support Chinese characters, set Content-type to UTF-8. For example, Content-Type: application/json; charset=utf-8.

The request body varies between APIs. Some APIs do not require the request body, such as the APIs requested using the GET and DELETE methods.

For the API for creating an IAM user as an administrator, you can check the required request parameters and their description in the API request. The following provides an example request with a body included. Replace the fields in bold with the actual values.

• accountid: ID of the account to which the IAM user belongs.
• username: IAM username to be created.
• email: email address of the IAM user.
• ********: login password of the IAM user.

POST https://iam.ap-southeast-1.myhuaweicloud.com/v3.0/OS-USER/users
Content-Type: application/json 
X-Sdk-Date: 20240416T095341Z 
Authorization: SDK-HMAC-SHA256 Access=****************, SignedHeaders=content-type;host;x-sdk-date, Signature=**************** 
 
{ 
     "user": { 
         "domain_id": "accountid", 
         "name": "username", 
         "password": "**********", 
         "email": "email", 
         "description": "IAM User Description" 
     } 
 }

If all data required for the API request is available, you can send the request to call the API through curl, Postman, or coding.