membphis commented on issue #1684:
URL:
https://github.com/apache/incubator-apisix/issues/1684#issuecomment-641820011
```
local body = vars[\"request_body\"]
local a1 = body[\"a1\"]
local a2 = body[\"a2\"]
return a1 == \"a1\" and a2 == \"a2\"
```
that is the wrong way to fetch the request body.
please take a look at this:
https://github.com/openresty/lua-nginx-module#ngxreqget_body_data
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