X-IPLB-Request-Id
The HTTP X-IPLB-Request-Id response header is an unofficial header sent by OVHcloud infrastructure, carrying a unique identifier assigned to the request by OVH's IP Load Balancing service.
Note
The "X-" naming convention for HTTP headers, "X" referring to "experimental", has been deprecated and needs to be transitioned to the formal naming convention for HTTP headers.
Usage
OVHcloud's IP Load Balancing (IPLB) service distributes incoming traffic across backend servers within OVH's infrastructure. When a request passes through the IPLB layer, OVH assigns a unique identifier to the request and attaches the identifier to the response as X-IPLB-Request-Id.
The identifier enables end-to-end tracing of a request through OVH's network. When something goes wrong (a timeout, an unexpected error, or an anomalous response), the value from this header provides a reference point for OVH support engineers to locate the specific request in internal logs. This makes the header particularly useful when opening support tickets with OVHcloud, tying the reported issue to a concrete infrastructure event. The header appears alongside X-IPLB-Instance, identifying the specific load balancer node handling the request.
Values
Hexadecimal request identifier
The value is a hexadecimal string in HAProxy unique-id format, using colons and underscores as delimiters. The format encodes connection and request details and is opaque to external consumers. The format is intended for internal log correlation rather than client-side interpretation.
Example
A response routed through OVH's load balancing layer includes a hexadecimal request identifier.
X-IPLB-Request-Id: 0003B5B7:07BF_0227E461:0050_67C14A5B_3A29E:0836
Both IPLB headers often appear together. The request ID identifies the transaction while the instance ID identifies which load balancer node handled the request.
X-IPLB-Request-Id: 0003B5B7:07BF_0227E461:0050_67C14A5B_3A29E:0836
X-IPLB-Instance: 52345
Takeaway
The X-IPLB-Request-Id header carries a unique request identifier assigned by OVHcloud's IP Load Balancing service. The value is an opaque token for tracing requests through OVH infrastructure and for referencing specific transactions in support interactions.