Cannot start sidecar proxy if the -sidecar-for has capital letters exactly matching the proxying service id

[nitsh]

Overview of the Issue

Cannot start sidecar proxy if the -sidecar-for has capital letters exactly matching the proxying service id

Reproduction Steps

1. Register a service on consul agent with following service config :

{
  "services": [
  {
    "id": "Service_A",
    "name": "Service_A",
    "port": 80,
    "connect": {
      "sidecar_service": {
        "proxy": {
          "upstreams": [
            {
              "destination_name": "service_x",
              "local_bind_port": 11000
            }
          ]
        }
      }
    }
  }
]
} 

2. Run consul connect proxy -sidecar-for Service_A will fail
3. Run consul connect proxy -sidecar-for service_a will be successful

Probable Root Cause

The code does strings.ToLower before comparing with -sidecar-for value : https://github.com/hashicorp/consul/blob/master/command/connect/proxy/proxy.go#L230

[stale]

Hey there,
We wanted to check in on this request since it has been inactive for at least 60 days.
If you think this is still an important issue in the latest version of Consul
or its documentation please reply with a comment here which will cause it to stay open for investigation.
If there is still no activity on this issue for 30 more days, we will go ahead and close it.

Feel free to check out the community forum as well!
Thank you!

[jamesnyika]

I can confirm that this is still an issue.
Workaround is to just change all your names and IDs for services to lower case.