rzo1 commented on code in PR #2171:
URL: https://github.com/apache/stormcrawler/pull/2171#discussion_r4053779130


##########
core/src/main/java/org/apache/stormcrawler/protocol/ProtocolResponse.java:
##########
@@ -78,6 +82,36 @@ public class ProtocolResponse {
      */
     public static final String PROTOCOL_MD_PREFIX_PARAM = "protocol.md.prefix";
 
+    /** Prefix of the metadata keys holding the timings a protocol reports 
about a fetch. */
+    public static final String METRICS_PREFIX = "metrics.";
+
+    /** Lowercased: metadata keys are normalised that way, and so are header 
names. */
+    private static final Set<String> RESERVED_METADATA_KEYS =
+            Stream.of(
+                            REQUEST_HEADERS_KEY,
+                            RESPONSE_HEADERS_KEY,
+                            RESPONSE_IP_KEY,
+                            REQUEST_TIME_KEY,
+                            PROTOCOL_VERSIONS_KEY,
+                            CIPHER_SUITE_KEY,
+                            TRIMMED_RESPONSE_KEY,
+                            TRIMMED_RESPONSE_REASON_KEY,
+                            REDIRECTED_TO_KEY)

Review Comment:
   Yes, reserved `playwright.protocol.start` and `playwright.protocol.end` as 
well, with a test.



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