tokers commented on issue #267:
URL: https://github.com/apache/apisix-docker/issues/267#issuecomment-1005583298


   > seems like the `resty-etcd` use a regular to check the etcd url, and the 
rule will reject the char `-`
   > 
   > 
https://github.com/api7/lua-resty-etcd/blob/f75f4c551b048e00233df38ab725b46218b35de9/lib/resty/etcd/v3.lua#L240
   > 
   > ```lua
   >     for _, host in ipairs(http_hosts) do
   >         local m, err = re_match(host,
   >             [=[([^\/]+):\/\/([\da-zA-Z.-]+|\[[\da-fA-F:]+\]):?(\d+)?$]=], 
"jo")
   >         if not m then
   >             return nil, "invalid http host: " .. host .. ", err: " .. (err 
or "not matched")
   >         end
   > ```
   > 
   > maybe try with `mf-etcd` instead
   
   Oh, yes, and actually `_` is not a valid char in the domain.


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