wu-sheng commented on a change in pull request #5235:
URL: https://github.com/apache/skywalking/pull/5235#discussion_r465492039



##########
File path: 
apm-sniffer/apm-sdk-plugin/feign-default-http-9.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/feign/http/v9/DefaultHttpClientInterceptor.java
##########
@@ -81,6 +82,16 @@ public void beforeMethod(EnhancedInstance objInst, Method 
method, Object[] allAr
         Tags.HTTP.METHOD.set(span, request.method());
         Tags.URL.set(span, request.url());
         SpanLayer.asHttp(span);
+        if (FeignPluginConfig.Plugin.Feign.TRACE_PARAMS) {
+            if (request.charset() != null && request.body() != null) {
+                String tagValue = new String(request.body(), 
request.charset());

Review comment:
       This is not just tracking the HTTP parameter, this is tracking the whole 
request BODY. The config name and document should be adjusted.
   Also, you should do this based on HTTP request type, an HTTP request could 
include binary(such as a file), please use the format in the headers to filter 
the requests.




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