slene opened a new issue #4516:
URL: https://github.com/apache/apisix/issues/4516
### Issue description
### Environment
* apisix version (cmd: `apisix version`): 2.6
* OS (cmd: `uname -a`): centos 7.8
### Minimal test code / Steps to reproduce the issue
```
{
"uris": [
"/*"
],
"name": "route",
"methods": [
"GET"
],
"vars": [
[
"cookie_upstream",
"==",
"dev"
]
],
"status": 1
}
```
When cookie cookie_upstream not found.
```
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"
```
When cookie header not exists.
```
2021/07/01 19:38:50 [warn] 46#46: *19719 [lua] ctx.lua:157: __index():
failed to fetch cookie value by key: cookie_upstream error: no cookie found in
the current request, client: 127.0.0.1, server: _, request: "GET / HTTP/1.1",
host: "localhost:9181"
```
It generates a lot of useless logs. If this is unexpected, I can submit a pr.
```diff
elseif core_str.has_prefix(key, "cookie_") then
local cookie = t.cookie
- if cookie then
+ if cookie and ngx.var.http_cookie then
local err
val, err = cookie:get(sub_str(key, 8))
- if not val then
+ if err then
log.warn("failed to fetch cookie value by key: ",
key, " error: ", err)
end
```
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