Keycloak-找不到指定孩子的publicKey

Question

我有一个分为前端和后端服务的应用程序。前端具有公共访问权限，而后端是机密的。当我尝试授权从后端获取响应时，出现以下错误：

cache-control: no-cache, no-store, max-age=0, must-revalidate 
content-length: 0 
date: Fri, 06 Dec 2019 09:16:16 GMT 
expires: 0 
pragma: no-cache 
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers 
www-authenticate: Bearer realm="my_realm", error="invalid_token", error_description="Didn't 
find publicKey for specified kid", Bearer realm="my_realm", error="invalid_token", 
error_description="Didn't find publicKey for specified kid" 
x-content-type-options: nosniff 
x-frame-options: DENY 
x-xss-protection: 1; mode=block

这是我对这两种服务的配置：

Backend:
    keycloak:
        auth-server-url: http://localhost:8081/auth
        realm: my_realm
        resource: your-client-id
        ssl-required: external
        credentials.secret: your-client-secret
Frontend:
    sso: {
        url: 'http://localhost:8081/auth',
        realm: 'my_realm',
        clientId: 'your-frontend-client'
    }

我正在将keycloak 7.0.1与Spring Security一起使用。

我是否缺少任何其他配置来允许来自公共客户端的授权？