vaibhavsw opened a new issue, #7915:
URL: https://github.com/apache/apisix/issues/7915
### Description
I have written a transformer that transforms the HTTP request body in
`serverless-pre-function` in the `before-proxy` phase
```JSON
"serverless-pre-function": {
"disable": false,
"functions": [
"return function(conf, ctx) local core = require(\"apisix.core\")
local httpc = require(\"resty.http\").new() \n ngx.req.read_body() \n local
res, err = httpc:request_uri(\"http://host.docker.internal:9191/transform\";,
{method = \"POST\", body = ngx.req.get_body_data(), headers = {
[\"Content-Type\"] = \"application/json\", [\"Upstream\"] =
core.request.header(ctx, \"Upstream\"), [\"Transformer\"] =
core.request.header(ctx, \"Transformer\")}}) ngx.req.set_body_data(res.body)
end"
],
"phase": "before_proxy"
}
```
However, when this is executed, it is throwing below error.
```bash
2022/09/14 06:50:39 [error] 46#46: *1287423 lua entry thread aborted:
runtime error: [string "return function(conf, ctx) local core = requi..."]:3:
attempt to call field 'set_body_data' (a string value)
stack traceback:
coroutine 0:
[string "return function(conf, ctx) local core = requi..."]: in
function 'func'
/usr/local/apisix/apisix/plugins/serverless/init.lua:84: in function
'phase_func'
/usr/local/apisix/apisix/plugin.lua:897: in function 'common_phase'
/usr/local/apisix/apisix/init.lua:555: in function 'http_access_phase'
access_by_lua(nginx.conf:284):2: in main chunk, client: 172.18.0.1,
server: _, request: "POST /card/balance HTTP/1.1", host: "127.0.0.1:9080"
```
The expectation is to override the client request body with the transformed
request body after accessing the external service with resty.http and then that
must be sent to the upstream.
### Environment
- APISIX version (run `apisix version`): 2.15
- Operating system (run `uname -a`): MacOS
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`): nginx
version: openresty/1.21.4.1
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`): 3.4.15
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`): 3.8.0
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