request help: health check doesn't work

[liangliang4ward]

Issue description

ref: https://github.com/apache/apisix/blob/master/docs/en/latest/health-check.md
{ "uri": "/index.html", "name": "sdfdsf", "plugins": { "limit-count": { "allow_degradation": false, "count": 2, "key": "remote_addr", "policy": "local", "rejected_code": 503, "show_limit_quota_header": true, "time_window": 60 } }, "upstream": { "nodes": [ { "host": "127.0.0.1", "port": 1970, "weight": 1 }, { "host": "127.0.0.1", "port": 1980, "weight": 1 } ], "retries": 2, "timeout": { "connect": 6, "send": 6, "read": 6 }, "type": "roundrobin", "checks": { "active": { "concurrency": 10, "healthy": { "http_statuses": [ 200, 302 ], "interval": 2, "successes": 1 }, "host": "foo.com", "http_path": "/status", "port": 80, "req_headers": [ "User-Agent: curl/7.29.0" ], "timeout": 5, "type": "http", "unhealthy": { "http_failures": 2, "http_statuses": [ 429, 404, 500, 501, 502, 503, 504, 505 ], "interval": 1, "tcp_Failures": 2, "timeouts": 3 } }, "passive": { "healthy": { "http_statuses": [ 200, 201 ], "successes": 3 }, "type": "http", "unhealthy": { "http_failures": 3, "http_statuses": [ 500 ], "tcp_failures": 3, "timeouts": 7 } } }, "scheme": "http", "pass_host": "pass", "keepalive_pool": { "idle_timeout": 60, "requests": 1000, "size": 320 } }, "status": 1 }

curl localhost:9090/v1/healthcheck
返回为空

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:
• the plugin runner version, if the issue is about a plugin runner (cmd: depended on the kind of runner):
• luarocks version, if the issue is about installation (cmd: luarocks --version):

[tzssangglass]

The health check is lazy loaded, you need to let the apisix proxy request to upstream, and then the health check will be available.