slene commented on issue #4516:
URL: https://github.com/apache/apisix/issues/4516#issuecomment-872669982
@spacewander
I think that value does not exist is not an error. The log should be
recorded when err exists.
```
local value = ctx.var["cookie_upstream"]
if value then
-- do something
end
```
```
2021/07/01 19:30:06 [warn] 46#46: *2782 [lua] ctx.lua:157: __index(): failed
to fetch cookie value by key: cookie_upstream error: nil, client: 127.0.0.1,
server: _, request: "GET / HTTP/1.1", host: "localhost:9181"
```
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