我正在尝试获取Docker集线器的目录列表，但到目前为止，我只是在响应中遇到错误。我的理解是，我需要在目录请求中传递一个承载令牌，因此我首先要获得具有相关范围的令牌：

curl -u "username:password "https://auth.docker.io/token?service=registry.docker.io&scope=registry:catalog:*"

（这是使用我的Docker Hub帐户中的用户名/密码）

然后，我将返回的令牌传递给注册表：

curl -vL -H "Authorization: Bearer eyJhbGciOiJFUzI1NiIsInR5cCI6I(...)" https://registry-1.docker.io/v2/_catalog

响应该请求，我得到：

*   Trying 54.86.130.73...
* Connected to registry-1.docker.io (54.86.130.73) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate: *.docker.io
* Server certificate: RapidSSL SHA256 CA - G3
* Server certificate: GeoTrust Global CA
> GET /v2/_catalog HTTP/1.1
> Host: registry-1.docker.io
> User-Agent: curl/7.43.0
> Accept: */*
> Authorization: Bearer eyJhbGciOiJFUzI1NiIsInR5cCI6I(...)
>
< HTTP/1.1 401 Unauthorized
HTTP/1.1 401 Unauthorized
< Content-Type: application/json; charset=utf-8
Content-Type: application/json; charset=utf-8
< Docker-Distribution-Api-Version: registry/2.0
Docker-Distribution-Api-Version: registry/2.0
< Www-Authenticate: Bearer realm="https://auth.docker.io/token",service="registry.docker.io",scope="registry:catalog:*",error="insufficient_scope"
Www-Authenticate: Bearer realm="https://auth.docker.io/token",service="registry.docker.io",scope="registry:catalog:*",error="insufficient_scope"
< Date: Fri, 06 May 2016 23:00:08 GMT
Date: Fri, 06 May 2016 23:00:08 GMT
< Content-Length: 134
Content-Length: 134
< Strict-Transport-Security: max-age=31536000
Strict-Transport-Security: max-age=31536000
<
{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"registry","Name":"catalog","Action":"*"}]}]}

…这似乎要求我返回并获得我在上面输入的网址的授权。

应该可以吗？如果是这样，我想念什么？