debug more

dd-java-agent/testing/src/main/groovy/datadog/trace/agent/test/server/http/TestHttpServer.groovy

@@ -342,7 +342,7 @@ class TestHttpServer implements AutoCloseable {
       clone.resolveStrategy = Closure.DELEGATE_FIRST
 
       try {
-        clone(api) // come back to here!!!
+        clone(api)
       } catch (Exception e) {
         api.response.status(500).send(e.getMessage())
         e.printStackTrace()
@@ -503,19 +503,10 @@ class TestHttpServer implements AutoCloseable {
   static class Headers {
     private final Map<String, String> headers
 
-    // FIX THIS...... setting header to wrong value, but also fails when header is hardcoded to correct value
     private Headers(Request request) {
       this.headers = [:]
       request.getHeaderNames().each {
-        String tag = request.getHeader(it)
-        System.out.println("tag: " + tag)
-        if (tag == "foo,bar") {
-          headers.put(it, "foo,bar,baz")
-          System.out.println("set " + it + " to " + headers.get(it))
-        } else {
-          headers.put(it, tag)
-        }
-        //        headers.put(it, request.getHeader(it))
+        headers.put(it, request.getHeader(it))
       }
     }
 

dd-java-agent/testing/src/main/java/datadog/trace/agent/test/server/http/HttpServletRequestExtractAdapter.java

@@ -28,6 +28,10 @@ public void forEachKey(
         System.out.println("value: " + carrier.getHeader(header));
         System.out.println("========= END ACCEPT IS CALLED HERE   =========");
       }
+      // ISSUE HERE
+      // `getHeader` in Request.class:604 calls `get` in HttpFields.class:164
+      //  which returns only the first value for the header, instead of all values
+      //  for the header name.
       if (!classifier.accept(header, carrier.getHeader(header))) {
         return;
       }