request help: apisix  plugin authz-keycloak fail 

### Issue description

router info：
{
  "uris": [
    "/*"
  ],
  "name": "router",
  "plugins": {
    "authz-keycloak": {
      "audience": "spring-client",
      "cache_ttl_seconds": 86400,
      "grant_type": "urn:ietf:params:oauth:grant-type:uma-ticket",
      "http_method_as_scope": false,
      "keepalive": true,
      "keepalive_pool": 5,
      "keepalive_timeout": 60000,
      "lazy_load_paths": false,
      "policy_enforcement_mode": "ENFORCING",
      "ssl_verify": true,
      "timeout": 3000,
      "token_endpoint": "http://127.0.0.1:8090/auth/realms/spring/protocol/openid-connect/token"
    }
  },
  "upstream_id": "368495760469131974",
  "status": 1
}
upstream info
{"nodes":[{"host":"192.168.3.101","port":8081,"weight":10},{"host":"192.168.3.101","port":8082,"weight":10}],"timeout":{"connect":6,"read":6,"send":6},"type":"roundrobin","scheme":"http","pass_host":"pass","name":"gateway"}


![image](https://user-images.githubusercontent.com/47839081/129707775-f8dc07a7-67c8-4fd5-826f-92a8b8d214d5.png)

apisix sevice ip ：192.168.2.67

request：
GET http://192.168.2.67:9080/products
GET /products HTTP/1.1
Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJYRkttc0JQLUgtX2twdUNCVXFvTk1kcUlWc3RZT1FDbzVBUzR2bVdULUFVIn0.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.GGh5JYppeTOeMVblk3br4A6f4kvn51u0kvFXLJuBknvHm9aPnlWY6JisXZaWSKcQgqTworpXZc1K5Qify7Go0B30MJpJRbuHQh3fCPbPxG1obqVYzQQNgTHeel936shG8BrdWy5D-w-eYfnQfUY-6jV5R0Yg1lAvk41sv_K2P8dltmRHxazFnh5vUeCTpRpaSbeA7SWig6dcdBaD3cHI-mhscKar16QFQNfzuPN5JWuItgl2I1btLq26y6F1xyr8Bg1jGzv1Si9YZBUn6QnsNmKcTO9q9Exk0IMxjtaVLXX2lvCKCc_i4kBsAtyjU-GH-pAAZi1RC0nhd9psP8X8ng
User-Agent: PostmanRuntime/7.26.8
Accept: */*
Cache-Control: no-cache
Postman-Token: 111b752e-0821-4a03-837a-14aff5e11209
Host: 192.168.2.67:9080
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
HTTP/1.1 500 Internal Server Error
Date: Tue, 17 Aug 2021 10:01:26 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 553
Connection: close
ETag: "611b237b-229"
Server: APISIX/2.6
<!DOCTYPE html>
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<title>500 Internal Server Error</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>An error occurred.</h1>
<p>You can report issue to <a href="https://github.com/apache/apisix/issues">APISIX</a></p>
<p><em>Faithfully yours, <a href="https://apisix.apache.org/">APISIX</a>.</em></p>
</body>
</html>



### Environment

- apisix version (cmd: `apisix version`):
- OS (cmd: `uname -a`):
- OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`):
- etcd version, if have (cmd: run `curl http://127.0.0.1:9090/v1/server_info` to get the info from server-info API):
- apisix-dashboard version, if have:
- luarocks version, if the issue is about installation (cmd: `luarocks --version`):
- 

![image](https://user-images.githubusercontent.com/47839081/129707601-dbd46d95-964a-4749-9097-8360212b204f.png)



curl http://127.0.0.1:9000/v1/server_info
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"
    />
    <title>Apache APISIX Dashboard</title>
    <link rel="icon" href="/favicon.png" type="image/x-icon" />
    <link rel="stylesheet" href="/umi.ced15bae.css" />
    <script>
      window.routerBase = "/";
    </script>
    <script>
      //! umi version: 3.4.2
    </script>
  </head>
  <body>
    <noscript>Out-of-the-box mid-stage front/design solution!</noscript>
    <div id="root">
      <style>
        html,
        body,
        #root {
          height: 100%;
          margin: 0;
          padding: 0;
        }
        #root {
          background-repeat: no-repeat;
          background-size: 100% auto;
        }
        .page-loading-warp {
          display: flex;
          align-items: center;
          justify-content: center;
          padding: 98px;
        }
        .ant-spin {
          position: absolute;
          display: none;
          -webkit-box-sizing: border-box;
          box-sizing: border-box;
          margin: 0;
          padding: 0;
          color: rgba(0, 0, 0, 0.65);
          color: #1890ff;
          font-size: 14px;
          font-variant: tabular-nums;
          line-height: 1.5;
          text-align: center;
          vertical-align: middle;
          list-style: none;
          opacity: 0;
          -webkit-transition: -webkit-transform 0.3s
            cubic-bezier(0.78, 0.14, 0.15, 0.86);
          transition: -webkit-transform 0.3s
            cubic-bezier(0.78, 0.14, 0.15, 0.86);
          transition: transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86);
          transition: transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86),
            -webkit-transform 0.3s cubic-bezier(0.78, 0.14, 0.15, 0.86);
          -webkit-font-feature-settings: "tnum";
          font-feature-settings: "tnum";
        }

        .ant-spin-spinning {
          position: static;
          display: inline-block;
          opacity: 1;
        }

        .ant-spin-dot {
          position: relative;
          display: inline-block;
          width: 20px;
          height: 20px;
          font-size: 20px;
        }

        .ant-spin-dot-item {
          position: absolute;
          display: block;
          width: 9px;
          height: 9px;
          background-color: #1890ff;
          border-radius: 100%;
          -webkit-transform: scale(0.75);
          -ms-transform: scale(0.75);
          transform: scale(0.75);
          -webkit-transform-origin: 50% 50%;
          -ms-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
          opacity: 0.3;
          -webkit-animation: antSpinMove 1s infinite linear alternate;
          animation: antSpinMove 1s infinite linear alternate;
        }

        .ant-spin-dot-item:nth-child(1) {
          top: 0;
          left: 0;
        }

        .ant-spin-dot-item:nth-child(2) {
          top: 0;
          right: 0;
          -webkit-animation-delay: 0.4s;
          animation-delay: 0.4s;
        }

        .ant-spin-dot-item:nth-child(3) {
          right: 0;
          bottom: 0;
          -webkit-animation-delay: 0.8s;
          animation-delay: 0.8s;
        }

        .ant-spin-dot-item:nth-child(4) {
          bottom: 0;
          left: 0;
          -webkit-animation-delay: 1.2s;
          animation-delay: 1.2s;
        }

        .ant-spin-dot-spin {
          -webkit-transform: rotate(45deg);
          -ms-transform: rotate(45deg);
          transform: rotate(45deg);
          -webkit-animation: antRotate 1.2s infinite linear;
          animation: antRotate 1.2s infinite linear;
        }

        .ant-spin-lg .ant-spin-dot {
          width: 32px;
          height: 32px;
          font-size: 32px;
        }

        .ant-spin-lg .ant-spin-dot i {
          width: 14px;
          height: 14px;
        }

        @media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
          .ant-spin-blur {
            background: #fff;
            opacity: 0.5;
          }
        }

        @-webkit-keyframes antSpinMove {
          to {
            opacity: 1;
          }
        }

        @keyframes antSpinMove {
          to {
            opacity: 1;
          }
        }

        @-webkit-keyframes antRotate {
          to {
            -webkit-transform: rotate(405deg);
            transform: rotate(405deg);
          }
        }

        @keyframes antRotate {
          to {
            -webkit-transform: rotate(405deg);
            transform: rotate(405deg);
          }
        }
      </style>
      <div
        style="
          display: flex;
          justify-content: center;
          align-items: center;
          flex-direction: column;
          min-height: 420px;
          height: 100%;
        "
      >
        <div class="page-loading-warp">
          <div class="ant-spin ant-spin-lg ant-spin-spinning">
            <span class="ant-spin-dot ant-spin-dot-spin"
              ><i class="ant-spin-dot-item"></i><i class="ant-spin-dot-item"></i
              ><i class="ant-spin-dot-item"></i><i class="ant-spin-dot-item"></i
            ></span>
          </div>
        </div>
        <div
          style="display: flex; justify-content: center; align-items: center"
        >
          <img src="/favicon.png" width="32" style="margin-right: 8px" />
          Apache APISIX Dashboard
        </div>
      </div>
    </div>

    <script src="/umi.426feac3.js"></script>
  </body>
</html>
[root@Keycloak ~]#

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request help: apisix plugin authz-keycloak fail #4840

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request help: apisix plugin authz-keycloak fail #4840

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