christagger commented on issue #226:
URL:
https://github.com/apache/apisix-java-plugin-runner/issues/226#issuecomment-1383460144
here is my code, i want to calculate the request-response time :
```java
public class DemoFilter implements PluginFilter {
private final Logger logger = LoggerFactory.getLogger(DemoFilter.class);
@Override
public String name() {
return "DemoFilter";
}
@Override
public void filter(HttpRequest request, HttpResponse response,
PluginFilterChain chain) {
logger.info("DemoFilter is running");
// TODO : add a custom header "startTimestamp" here (or added in
another plugin's filter() method)
request.setHeader("startTimestamp",
String.valueOf(System.currentTimeMillis()));
chain.filter(request, response);
}
@Override
public void postFilter(PostRequest request, PostResponse response,
PluginFilterChain chain) {
// TODO : i want to get the custom header "startTimestamp" here, so
i can
// calculate the request-response time
chain.postFilter(request, response);
}
/**
* If you need to fetch some Nginx variables in the current plugin, you
will need to declare them in this function.
* @return a list of Nginx variables that need to be called in this
plugin
*/
@Override
public List<String> requiredVars() {
List<String> vars = new ArrayList<>();
vars.add("remote_addr");
vars.add("server_port");
return vars;
}
/**
* If you need to fetch request body in the current plugin, you will
need to return true in this function.
*/
@Override
public Boolean requiredBody() {
return true;
}
}
```
Or the more common scenario is: the custom header added in a pre-req-plugin
can be passed all along the request and can be acquired in every
post-resp-plugin postFilter() method.
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