Grafana On-Call's Backend URL

Hi guys, I tried to integrate Grafana On-Call into my Grafana instance. However, in the configuration process (1st image), they threw an error like this (2nd image) while I check that URL on my browser, and it returned “OK” (3rd image). Please tell me how to fix it. Thanks in advance
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Some things to ask:

  • Are you running grafana inside a docker container? If so, this container might not have access to the resource
  • Are you sure the machine that runs grafana has access to this resource? (that your computer has access to the resource doesn’t guarantee the machine or container running grafana has it)
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