docs: private void parseDelayedExtract(Map<Object, Object> props) {
          Object value = props.get(HttpConfigConstants.PROPNAME_EXTRACT_VALUE);
          if (null != value) {
              this.bExtractValue = convertBoolean(value);
              if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled()) {
                  Tr.event(tc, "Config: header value extraction is " + shouldExtractValue());
              }
          }
      }