Response Headers

This guide covers the headers that Moovweb XDN injects into responses making them visible to your client code.

General headers

• x-xdn-version: version fingerprint that includes XDN version number, site build number and UTC timestamp of the build
• x-xdn-t: timings of all the components in Moovweb critical path that served your request
• x-xdn-request-id: the unique ID of the request on Moovweb XDN infrastructure
• x-xdn-hit-request-id: the unique ID of the request whose cached response is being returned (not present if cache miss)

Structure of x-xdn-t

The format is x-xdn-t: <id>=<time>[,<id2>=<time2>...]

x-xdn-t is an order list of timings: values are prepended at response time. Thus reading them left to right goes from the outermost edge component to the innermost cloud component that handled the request.

The components are:

• Level 1 CDN POP = o
• Level 2 CDN POP = s
• Custom Moovweb Proxy = p
• JavaScript Compute Workers = w

All times are in milliseconds.

Troubleshooting headers

The following headers are used internally by Moovweb staff to troubleshoot issues with requests.

• x-xdn-status: statuses of different components in Moovweb XDN critical path that serviced your request
• x-xdn-components: versions of different components in Moovweb XDN critical path that serviced your request