**Introducing a new console experience for AWS WAF**

You can now use the updated experience to access AWS WAF functionality anywhere in the console. For more details, see [Working with the console](https://docs.aws.amazon.com/waf/latest/developerguide/working-with-console.html). 

# Rate limit the requests that are missing a specific header
<a name="waf-rate-based-example-limit-missing-header"></a>

To limit the number of requests that are missing a specific header, you can use the **Count all** aggregation option with a scope-down statement. Configure the scope-down statement with a logical `NOT` statement containing a statement that returns true only if the header exists and has a value. 

The following JSON listing shows an example of this rule configuration. 

```
{
  "Name": "test-rbr",
  "Priority": 0,
  "Action": {
    "Block": {}
  },
  "VisibilityConfig": {
    "SampledRequestsEnabled": true,
    "CloudWatchMetricsEnabled": true,
    "MetricName": "test-rbr"
  },
  "Statement": {
    "RateBasedStatement": {
      "Limit": 1000,
      "AggregateKeyType": "CONSTANT",
      "EvaluationWindowSec": 300,
      "ScopeDownStatement": {
        "NotStatement": {
          "Statement": {
            "SizeConstraintStatement": {
              "FieldToMatch": {
                "SingleHeader": {
                  "Name": "user-agent"
                }
              },
              "ComparisonOperator": "GT",
              "Size": 0,
              "TextTransformations": [
                {
                  "Type": "NONE",
                  "Priority": 0
                }
              ]
            }
          }
        }
      }
    }
  }
}
```