fullyQualifiedDomainName

Amazon Route 53 behavior depends on whether you specify a value for IPAddress . If you specify a value for IPAddress : Amazon Route 53 sends health check requests to the specified IPv4 or IPv6 address and passes the value of FullyQualifiedDomainName in the Host header for all health checks except TCP health checks. This is typically the fully qualified DNS name of the endpoint on which you want Route 53 to perform health checks. When Route 53 checks the health of an endpoint, here is how it constructs the Host header:

• If you specify a value of 80 for Port and HTTP or HTTP_STR_MATCH for Type , Route 53 passes the value of FullyQualifiedDomainName to the endpoint in the Host header.

• If you specify a value of 443 for Port and HTTPS or HTTPS_STR_MATCH for Type , Route 53 passes the value of FullyQualifiedDomainName to the endpoint in the Host header.

• If you specify another value for Port and any value except TCP for Type , Route 53 passes FullyQualifiedDomainName:Port to the endpoint in the Host header. If you don't specify a value for FullyQualifiedDomainName , Route 53 substitutes the value of IPAddress in the Host header in each of the preceding cases. If you don't specify a value for IPAddress : Route 53 sends a DNS request to the domain that you specify for FullyQualifiedDomainName at the interval that you specify for RequestInterval . Using an IPv4 address that DNS returns, Route 53 then checks the health of the endpoint.

If you don't specify a value for IPAddress , Route 53 uses only IPv4 to send health checks to the endpoint. If there's no record with a type of A for the name that you specify for FullyQualifiedDomainName , the health check fails with a "DNS resolution failed" error. If you want to check the health of multiple records that have the same name and type, such as multiple weighted records, and if you choose to specify the endpoint only by FullyQualifiedDomainName , we recommend that you create a separate health check for each endpoint. For example, create a health check for each HTTP server that is serving content for www.example.com. For the value of FullyQualifiedDomainName , specify the domain name of the server (such as us-east-2-www.example.com), not the name of the records (www.example.com). In this configuration, if you create a health check for which the value of FullyQualifiedDomainName matches the name of the records and you then associate the health check with those records, health check results will be unpredictable. In addition, if the value that you specify for Type is HTTP , HTTPS , HTTP_STR_MATCH , or HTTPS_STR_MATCH , Route 53 passes the value of FullyQualifiedDomainName in the Host header, as it does when you specify a value for IPAddress . If the value of Type is TCP , Route 53 doesn't pass a Host header.