in sample/src/main/java/org/apache/apisix/plugin/runner/filter/ResponseFilter.java [36:50]
public void postFilter(PostRequest request, PostResponse response, PluginFilterChain chain) {
String configStr = request.getConfig(this);
Gson gson = new Gson();
Map<String, Object> conf = new HashMap<>();
conf = gson.fromJson(configStr, conf.getClass());
Map<String, String> headers = request.getUpstreamHeaders();
String contentType = headers.get("Content-Type");
Integer upstreamStatusCode = request.getUpstreamStatusCode();
response.setStatusCode(Double.valueOf(conf.get("response_code").toString()).intValue());
response.setBody((String) conf.get("response_body"));
response.setHeader((String) conf.get("response_header_name"), (String) conf.get("response_header_value"));
chain.postFilter(request, response);
}