docs: private void incrementHeaderCounter() {
          this.numberOfHeaders++;
          this.headerAddCount++;
          if (this.limitNumHeaders < this.numberOfHeaders) {
              String msg = "Too many headers in storage: " + this.numberOfHeaders;
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, msg);
              }
              throw new IllegalArgumentException(msg);
          }
      }