zdzh opened a new issue, #114:
URL: https://github.com/apache/apisix-go-plugin-runner/issues/114
### Issue description
我用request.Body来获取请求的body，但是当请求请求体过大时，该函数会提示获取失败，数据被截断。
### Environment
* APISIX Go Plugin Runner's version:
v0.3.0
* APISIX version:
2.15.0
* Go version:
go version go1.15.1 linux/amd64
* OS (cmd: `uname -a`):
Linux fefcfe0549f3 4.18.0 #1 SMP Tue Sep 27 10:33:52 CST 2022 x86_64 x86_64
x86_64 GNU/Linux
### Minimal test code / Steps to reproduce the issue
构造一个足够大的body，然后在go-runner中通过req.Body获取body
### What's the actual result? (including assertion message & call stack if
applicable)
传入的body首先提示存入一个临时文件，然后在调用req.Body时获取body失败，提示被截断。
觉得是存入临时文件的数据没有正确传递给go-runner，但是在ext-plugin/init.lua查看body的长度好像没问题
```
2022/11/14 17:15:43 [warn] 85510#85510: *444 a client request body is
buffered to a temporary file /usr/local/apisix/client_body_temp/0000000001,
client: 10.131.115.28, server: _, request: "POST ******** HTTP/1.1", host:
"127.0.0.1:9080"
2022/11/14 17:15:43 [warn] 85510#85510: *444 [lua] init.lua:319:
handle_extra_info(): request body len 900938, client: 10.131.115.28, server: _,
request: "POST ****** HTTP/1.1", host: "127.0.0.1:9080"
2022/11/14 17:15:43 [warn] 85514#85514: *49 [lua] init.lua:915:
2022-11-14T17:15:43.465+0800 INFO http/request.go:390 receive rpc
type: 3 data length: 900964
, context: ngx.timer
2022/11/14 17:15:43 [warn] 85514#85514: *49 [lua] init.lua:915:
2022-11-14T17:15:43.466+0800 ERROR util/msg.go:55 read: truncated, only
get the first 219260 bytes
github.com/apache/apisix-go-plugin-runner/internal/util.ReadErr
/home/go/pkg/mod/github.com/apache/[email protected]/internal/util/msg.go:55
github.com/apache/apisix-go-plugin-runner/internal/http.(*Request).askExtraInfo
/home/go/pkg/mod/github.com/apache/[email protected]/internal/http/request.go:394
github.com/apache/apisix-go-plugin-runner/internal/http.(*Request).Body
/home/go/pkg/mod/github.com/apache/[email protected]/internal/http/request.go:183
```
### What's the expected result?
获取body成功
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