supervisord collector failed

Host operating system: output of uname -a
Linux ip-100-71-24-185 4.15.0-1065-aws #69-Ubuntu SMP Thu Mar 26 02:17:29 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

node_exporter version: output of node_exporter --version

node_exporter, version 0.14.0-rc.2 (branch: master, revision: 0e60bb8e005c638605e59ac3f307e3d47e891a9f)
  build user:       root@504a104b89f5
  build date:       20170307-14:41:31
  go version:       go1.7.5

node_exporter command line flags
./node_exporter -collectors.enabled=supervisord -collector.supervisord.url="http://127.0.0.1:9001"

Are you running node_exporter in Docker?
No

What did you do that produced an error?
Starting the node_exporter with --collector.supervisord enabled, supervisord is listening on 127.0.0.1:9001
but when you try to see supervisord metrics by Curl it gives below output and supervisord collector get failed.

curl http://localhost:9100/metrics |grep "supervisor*"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  7523  100  7523    0     0  1224k      0 --:--:-- --:--:-- --:--:-- 1224k
node_exporter_scrape_duration_seconds{collector="supervisord",result="error",quantile="0.5"} 1.2884e-05
node_exporter_scrape_duration_seconds{collector="supervisord",result="error",quantile="0.9"} 1.2884e-05
node_exporter_scrape_duration_seconds{collector="supervisord",result="error",quantile="0.99"} 1.2884e-05
node_exporter_scrape_duration_seconds_sum{collector="supervisord",result="error"} 0.0028471110000000003
node_exporter_scrape_duration_seconds_count{collector="supervisord",result="error"} 3

ERRO[0054] ERROR: supervisord collector failed after 0.000016s: connection is shut down source="node_exporter.go:92"

What did you expect to see?
want to see supervisord metrics

What did you see instead?
supervisord collector failed

Start by reproducing the failure with node_exporter using --collector.supervisord and the reported supervisord URL, then inspect the supervisord collector's connection handling. Done means the collector no longer reports an error and supervisord metrics appear in the /metrics output.