为什么单个资源返回“_links”，返回“链接”以通过REST调用检索集合

Question

我开发了一个REST API，它可以根据请求返回Object或Single Resource的集合。我还以编程方式在每个对象上添加了“self”链接（Spring Hateos）。

Link self = ControllerLinkBuilder.linkTo(TenantController.class).slash(tenant.getTenantId()).withSelfRel();
tenantResource.add(self);

当返回响应主体时，我在单个资源GET上获得“_links”，其中获取集合的“链接”。为什么会有这种差异？

URL (GET) - http://localhost:8080/tenants

Response (it has "links")
========================
[
  {
    "tenantId": "56c98ebb42d34bd98763f61a",
    "name": "ONGC India",
    "abbreviation": "ONGC",
    "description": "ONGC India is a Indian Organization",
    "links": [
      {
        "rel": "self",
        "href": "http://localhost:8080/tenants/56c98ebb42d34bd98763f61a"
      }
    ]
  }
]

==========================================================================  
URL (GET) - http://localhost:8080/tenants/56c98ebb42d34bd98763f61a

Response (it has "_links")
==========================
{
  "tenantId" : "56c98ebb42d34bd98763f61a",
  "name" : "ONGC India",
  "abbreviation" : "ONGC",
  "description" : "ONGC India is a Indian Organization",
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/tenants/56c98ebb42d34bd98763f61a"
    }
  }
}