7.3.11. 异步请求
API 执行异步
POST 请求，除非用户用 Expect: 201-created 标头覆盖它们。
例如，某些资源（如虚拟机、磁盘、快照和模板）会异步创建。创建异步资源的请求会导致
202 Accepted 状态。202 Accepted 资源的初始文档结构还包含 creation_status 元素和创建状态更新的链接。例如：
POST /ovirt-engine/api/collection HTTP/1.1
Accept: application/xml
Content-Type: application/xml
<resource>
<name>Resource-Name</name>
</resource>
HTTP/1.1 202 Accepted
Content-Type: application/xml
<resource id="resource_id" href="/ovirt-engine/api/collection/resource_id">
<name>Resource-Name</name>
<creation_status>
<state>pending</state>
</creation status>
<link rel="creation_status"
href="/ovirt-engine/api/collection/resource_id/creation_status/creation_status_id"/>
...
</resource>
到
creation_status 链接的 GET 请求提供创建状态更新：
GET /ovirt-engine/api/collection/resource_id/creation_status/creation_status_id HTTP/1.1
Accept: application/xml
HTTP/1.1 200 OK
Content-Type: application/xml
<creation id="creation_status_id"
href="/ovirt-engine/api/collection/resource_id/creation_status/creation_status_id">
<status>
<state>complete</state>
</status>
</creation>
覆盖异步资源创建需要一个
Expect: 201-created 标头：
POST /ovirt-engine/api/collection HTTP/1.1
Accept: application/xml
Content-Type: application/xml
Expect: 201-created
<resource>
<name>Resource-Name</name>
</resource>
