Dynamic forwarding component-Server Load Balancer(SLB)-阿里云帮助中心

The dynamic forwarding component extracts the target host and port from HTTP request content and forwards requests directly to the extracted address. Use this component to route requests to dynamically determined endpoints without pre-registering backend servers, by extracting destination information from the query string or request headers.

The dynamic forwarding component must be used with an IP Address range server group, which defines the allowed target IP addresses and port ranges for forwarding.

Function type

Route scheduling

Field description

ComponentConfig

Parameter	Type	Required	Default	Description
RequestRules	RequestRuleItem[]	No	-	A list of target address extraction rules. A maximum of five rules are supported. Rules are matched in the order they appear in the list, and the first matched rule takes effect.

RequestRuleItem

Parameter	Type	Required	Default	Description
ExtractFrom	ExtractFromEnum	Yes	-	The source from which the target host and port are extracted.
ExtractType	ExtractTypeEnum	Yes	-	The extraction mode for the target host and port.
TargetKey	String	Conditionally required	-	The key name in Combined mode. The value format is host:port. This parameter is required when ExtractType is set to Combined.
TargetHostKey	String	Conditionally required	-	The key name for the target host in Separated mode. This parameter is required when ExtractType is set to Separated.
TargetPortKey	String	Conditionally required	-	The key name for the target port in Separated mode. This parameter is required when ExtractType is set to Separated.
DefaultPort	Integer	No	-	The fallback port used when no port is extracted by the rule. Valid values: `1 to 65535`. If this parameter is not specified and no port is extracted, the rule is considered unmatched and the next rule is evaluated.

ExtractFromEnum

Value	Description
QueryString	Extracts the target host and port from the query string.
Header	Extracts the target host and port from request headers.

ExtractTypeEnum

Value	Description
Combined	The target host and port are in the same key. The value format is host:port.
Separated	The target host and port are in two separate keys.

Error codes

HTTP status code	Error message	Description
403	endpoint not provided	The request does not contain an extractable target address. The dynamic forwarding component cannot determine the forwarding target.
403	endpoint not allowed	The extracted target IP address or port is not within the allowed range of the IP Address range server group.