wu-sheng commented on a change in pull request #6651:
URL: https://github.com/apache/skywalking/pull/6651#discussion_r603684251
##########
File path:
apm-sniffer/apm-sdk-plugin/spring-plugins/mvc-annotation-commons/src/main/java/org/apache/skywalking/apm/plugin/spring/mvc/commons/ReactiveRequestHolder.java
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@@ -37,7 +38,11 @@ public String getHeader(final String headerName) {
@Override
public Enumeration<String> getHeaders(final String headerName) {
- return
Collections.enumeration(this.serverHttpRequest.getHeaders().get(headerName));
+ List<String> values =
this.serverHttpRequest.getHeaders().get(headerName);
+ if (values == null) {
+ return null;
Review comment:
Is null expected when use this method? You used to say returning an
empty list.
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