attempt an implementation

sarahchen6 · sarahchen6 · commit 076071c80db7 · 2024-11-19T19:53:43.000-05:00
diff --git a/dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/instrumentation/decorator/HttpServerDecorator.java b/dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/instrumentation/decorator/HttpServerDecorator.java
@@ -626,7 +626,12 @@ public ResponseHeaderTagClassifier(AgentSpan span, Map<String, String> headerTag
     public boolean accept(String key, String value) {
       String mappedKey = headerTags.get(key.toLowerCase(Locale.ROOT));
       if (mappedKey != null) {
-        span.setTag(mappedKey, value);
+        Object existing_val = span.getTag(mappedKey);
+        if (existing_val == null) {
+          span.setTag(mappedKey, value);
+        } else {
+          span.setTag(mappedKey, existing_val.toString() + value);
+        }
       }
       return true;
     }

Original file line number	Diff line number	Diff line change
`@@ -626,7 +626,12 @@ public ResponseHeaderTagClassifier(AgentSpan span, Map<String, String> headerTag`
`626`	`626`	`public boolean accept(String key, String value) {`
`627`	`627`	`String mappedKey = headerTags.get(key.toLowerCase(Locale.ROOT));`
`628`	`628`	`if (mappedKey != null) {`
`629`		`- span.setTag(mappedKey, value);`
	`629`	`+ Object existing_val = span.getTag(mappedKey);`
	`630`	`+ if (existing_val == null) {`
	`631`	`+ span.setTag(mappedKey, value);`
	`632`	`+ } else {`
	`633`	`+ span.setTag(mappedKey, existing_val.toString() + value);`
	`634`	`+ }`
`630`	`635`	`}`
`631`	`636`	`return true;`
`632`	`637`	`}`