vector4wang opened a new issue, #10471:
URL: https://github.com/apache/apisix/issues/10471
### Description
I have written a custom plugin in Java with the aim of adding plugin
parameters to the HTTP response header. The code is as follows
```java
@Component
public class CustomFilter implements PluginFilter {
private final Logger logger =
LoggerFactory.getLogger(CustomFilter.class);
@Override
public String name() {
return "CustomFilter";
}
@Override
public void filter(HttpRequest request, HttpResponse response,
PluginFilterChain chain) {
// parse `conf` to json
String configStr = request.getConfig(this);
logger.info("filter configStr: {}", configStr);
JSONObject conf = JSONUtil.parseObj(configStr);
conf.forEach((k, v) -> {
response.setHeader(k, (String) v);
});
chain.filter(request, response);
}
@Override
public void postFilter(PostRequest request, PostResponse response,
PluginFilterChain chain) {
logger.info("响应后处理");
chain.postFilter(request, response);
}
@Override
public Boolean requiredRespBody() {
return PluginFilter.super.requiredRespBody();
}
}
```
I created a plugin enabled route using the admin API，
```curl
curl --location --request PUT
'xxxxxxx:9180/apisix/admin/routes/486660216419517121' --header 'X-API-KEY:
xxxxxxxxxxxxxxxxxx' --header 'Content-Type: application/json' --data '{
"name": "extHello",
"uri": "/extHello",
"plugins": {
"ext-plugin-pre-req": {
"conf": [
{
"name": "CustomFilter",
"value": "{}"
}
]
}
},
"upstream": {
"nodes": {
"xxxxxx:8080": 1
},
"type": "roundrobin"
}
}'
```
If conf.value is {}, the gateway can forward normally and the client can
receive the response body normally. At this time, there is no additional key in
the response header
**But** if conf.value is like this
```json
"conf": [
{
"name": "CustomFilter",
"value": "{\"X-CUSTOMER-KEY\":\"123\"}"
}
]
```
The client cannot receive the response body, but the response header has a
new key 'X-CUSTOMER-KEY' added
I compared the logs of Apisix and output an extra line without a response
body
**`use 200 as the default HTTP Status Code when setStatusCode is not
called`**
I know there is a problem here, but I don't know how to solve it
Does anyone know what the reason is?
### Environment
- APISIX version (run `apisix version`): 3.5.0
- Operating system (run `uname -a`): docker apache/apisix:3.5.0-debian
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`): 3.4.15
- Plugin runner version, for issues related to plugin runners:
```xml
<dependency>
<groupId>org.apache.apisix</groupId>
<artifactId>apisix-runner-starter</artifactId>
<version>0.4.0</version>
</dependency>
```
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