How to save original response body fields and add extra ones using nginx variables ($http_*) with response-rewrite plugin

[kuzds]

Description

Environment

[shreemaan-abhishek]

just to reconfirm, you want to modify some specific fields in the response body with the value from nginx variables.

[kuzds]

Yeah. And add couple new one

[shreemaan-abhishek]

it's gonna be a long process so either you can use serverless plugin to get the body and then parse it to a lua table then modify it as you want followed by setting the modified body as the response or put this logic in a new plugin. Here is an example to get you started:

curl http://127.0.0.1:9180/apisix/admin/routes/1  -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
  {
    "uri": "/get",
    "plugins": {
      "serverless-post-function": {
        "phase": "body_filter",
        "functions": [ "return function (conf, ctx)
    local core = require(\"apisix.core\")
    local body = core.response.hold_body_chunk(ctx)
    -- local new_body = transform(body)
    ngx.arg[1] = \"set new body here\"
    ngx.arg[2] = true
end"]
      }
    },
    "upstream": {
      "nodes": {
        "httpbin.org:80": 1
      },
      "type": "roundrobin"
    }
  }
'

[kuzds]

Thanks!