type

The type of health check that you want to create, which indicates how Amazon Route 53 determines whether an endpoint is healthy.

You can't change the value of Type after you create a health check. You can create the following types of health checks:

• HTTP : Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTP request and waits for an HTTP status code of 200 or greater and less than 400.

• HTTPS : Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTPS request and waits for an HTTP status code of 200 or greater and less than 400.

If you specify HTTPS for the value of Type , the endpoint must support TLS v1.0 or later.

• HTTP_STR_MATCH : Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTP request and searches the first 5,120 bytes of the response body for the string that you specify in SearchString .

• HTTPS_STR_MATCH : Route 53 tries to establish a TCP connection. If successful, Route 53 submits an HTTPS request and searches the first 5,120 bytes of the response body for the string that you specify in SearchString .

• TCP : Route 53 tries to establish a TCP connection.

• CLOUDWATCH_METRIC : The health check is associated with a CloudWatch alarm. If the state of the alarm is OK , the health check is considered healthy. If the state is ALARM , the health check is considered unhealthy. If CloudWatch doesn't have sufficient data to determine whether the state is OK or ALARM , the health check status depends on the setting for InsufficientDataHealthStatus : Healthy , Unhealthy , or LastKnownStatus .

Route 53 supports CloudWatch alarms with the following features:

• Standard-resolution metrics. High-resolution metrics aren't supported. For more information, see High-Resolution Metrics in the Amazon CloudWatch User Guide .

• Statistics: Average, Minimum, Maximum, Sum, and SampleCount. Extended statistics aren't supported.

• CALCULATED : For health checks that monitor the status of other health checks, Route 53 adds up the number of health checks that Route 53 health checkers consider to be healthy and compares that number with the value of HealthThreshold .

• RECOVERY_CONTROL : The health check is assocated with a Route53 Application Recovery Controller routing control. If the routing control state is ON , the health check is considered healthy. If the state is OFF , the health check is considered unhealthy. For more information, see How Route 53 Determines Whether an Endpoint Is Healthy in the Amazon Route 53 Developer Guide .