zxyao145 opened a new issue, #155:
URL: https://github.com/apache/apisix-go-plugin-runner/issues/155
### Issue description
The client uses `Content-Type:application/x-www-form-urlencoded ` to access
the HTTP API. After decrypting the body to json, I reset the request header by
`r.Header().Set("Content-Type", "application/json;charset=UTF-8")`, but found
that it sometimes does not work.
I have attempted to request 100 times, but there are 9 cases where it does
not take effect
the code of plugin:
```go
r.Header().Set("Content-Type", "application/json;charset=UTF-8")
r.SetBody(origBodyByte)
// pluginLogger is a wrapper for log that can output traceId
pluginLogger.Infof("request get Content-Type: %s",
r.Header().Get("Content-Type"))
```
the log of the plugin:
```
2024/01/09 20:15:00 [warn] 302#302: *913 [lua] init.lua:961:
2024-01-09T20:15:00.941+0800 INFO pluginlogger/logger.go:34
[00-3334f5bcb64c9c9cdf0da1997a9a81b6-5ff503ca821603ae-01] request get
Content-Type: application/json;charset=UTF-8
```
the log of http api:
```
2024-01-09 20:15:00.946 [3334f5bcb64c9c9cdf0da1997a9a81b6] [
http-nio-5001-exec-7:17758181 ] - [ DEBUG ]- [
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor
] Read "application/x-www-form-urlencoded;charset=UTF-8" to ["**********"]
2024-01-09 20:15:00.946 [3334f5bcb64c9c9cdf0da1997a9a81b6] [
http-nio-5001-exec-7:17758181 ] - [ DEBUG ]- [
com.xxxx.controller.TestController ]
Content-Type:application/x-www-form-urlencoded
```
Is there anyone who can help explain the reason?
### Environment
* APISIX Go Plugin Runner's version:
github.com/apache/apisix-go-plugin-runner
v0.5.1-0.20231128010119-a265bcd63ca1
* APISIX version: 3.6.0
* Go version: 1.19
* OS (cmd: uname -a): debian:bullseye-slim
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