# Respose-Tranformer response body change not being detected by other plugins that read the response body

**URL:** <https://discuss.konghq.com/t/respose-tranformer-response-body-change-not-being-detected-by-other-plugins-that-read-the-response-body/5225>\
**Category:** General\
**Created:** [December 30, 2019, 10:54pm UTC](https://discuss.konghq.com/t/respose-tranformer-response-body-change-not-being-detected-by-other-plugins-that-read-the-response-body/5225 "2019-12-30T22:54:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jose.bravo](https://avatars.discourse-cdn.com/v4/letter/j/22d042/32.png) [@jose.bravo](https://discuss.konghq.com/u/jose.bravo)\
**Post date:** [December 30, 2019, 10:54pm UTC](https://discuss.konghq.com/t/respose-tranformer-response-body-change-not-being-detected-by-other-plugins-that-read-the-response-body/5225/1 "2019-12-30T22:54:22Z")

</div>

Hello!  
I am working through a requirement where I need to append data to the response body using the response-transformer plugin. Right afterwards, another plugin (an extension of the kafka-log plugin) will read the response body and submit to a Kafka topic for processing. However, when the Kafka plugin reads the response body, it’s like the response transformer did not do its job at all. The field I added via response-transformer plugin is not available in the message that was dropped to Kafka or in what was returned to the calling client. If I disable the kafka-log plugin, then the response-transformer works as expected, but obviously with the message not being persisted to Kafka. Playing with the code, I commented out the sections that I believe could be causing the issue:

```
local chunk, eof = ngx.arg[1], ngx.arg[2]

if not eof then
  ngx.ctx.rt_body_chunks[ngx.ctx.rt_body_chunk_number] = chunk
  ngx.ctx.rt_body_chunk_number = ngx.ctx.rt_body_chunk_number + 1

```

– ngx.arg[1] = nil

```
else
  local body = table_concat(ngx.ctx.rt_body_chunks)
  local ok, err = producer:send(conf.topic, nil, cjson_encode(body))

```

– ngx.arg[1] = body  
end

By commenting the code out above, Kong now returns the payload as expected to the client (with the appended data by the response-transformer plugin), but the code above is not seeing the appended field and is sending the unchanged request to the Kafka topic. I will continue to look at the code further, but any advice here is welcome.

Priority:  
Kafka-Log: 5  
Respose-Transformer-Advanced: 800