Stored FreeWheel hits used /ad/l/, and the pack checks /ad/g/

What the stored tags were

Hosts ending in v.fwmrm.net showed up as short bursts, on the order of a hundred rows, rather than a month-long stream. The URL shape was https://2356e.v.fwmrm.net/ad/l/1 with semicolon-separated query groups. That is a FreeWheel ad-request host. It is not the path the current pack matches.

The network prefix before .v.fwmrm.net changes by site. The pack matches the suffix, so a different prefix would still select /ad/g/. The /ad/l/ path is what kept these stored rows off the pack.

What the pack covers

vendor/freewheel is a GET ad request on *.v.fwmrm.net/ad/g/. Global contracts apply to the first query group. Later groups that carry SDK Type B temporal slots get their own required-field and unique-id checks. Legacy flat fields stay optional. Account authorization and raw transport variants stay outside the pack. The pack page is the field table. This page only tells you when that table applies.

Open /packs/freewheel/ when the URL you copied contains /ad/g/. Run it with --rulepack vendor/freewheel. A finding there is a FreeWheel ad-request finding. It is not a finding about /ad/l/.

What /ad/l/ gets today

An /ad/l/ URL on v.fwmrm.net does not select vendor/freewheel. Core checks still parse the URL, flag insecure transport, and catch broken privacy macros. Directory attribution can still say FreeWheel because the directory lists the v.fwmrm.net suffix and points the vendor at the /ad/g/ pack. Attribution is not selection. If the report says core checks only, believe it.

Do not rewrite /ad/l/ into /ad/g/ to force the pack. That fabricates a request the player did not make. Save the original URL and, separately, an /ad/g/ fixture if you need to test the pack.

What this page does not claim

This page does not translate the /ad/l/1 query groups into required slot ids. The stored string shows s, n, t, f, r, adid, and reid names. Those names are not promoted to a contract. FreeWheel's HTML5 API document is what the /ad/g/ pack cites. It is not automatically the spec for /ad/l/.

Pixellint is not affiliated with FreeWheel. The logo links here, not to freewheel.com, because the sample path and the pack path need to be read together.

How to lint one tag

If the path contains /ad/g/, use the rulepack. If the path contains /ad/l/, use pixellint validate url with no vendor flag. Keep both files if a tag emits both. A clean /ad/g/ report does not cover the /ad/l/ sibling.

Semicolons in the query are part of the FreeWheel parameter style on the pack. Do not convert them to ampersands before validating an /ad/g/ URL, or the group splits the pack expects will move.

pixellint validate url @freewheel-ad-g.txt --rulepack vendor/freewheel
pixellint validate url @freewheel-ad-l.txt

Check the artifact

Paste the pixel URL or JSON body into the playground. Same engine as pixellint validate. Artifacts you test may be stored; see privacy.