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Synthetic ID Header [x-synthetic-id] is not being set on /integration re-hosted into first party publisher domain #205

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@jevansnyc

For example here:

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We should properly set the Synthetic ID header on all URL paths under the pub domain, provided the user hasn't opted out via the CMP.

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  1. added theissue type on Jan 28, 2026
  2. jevansnyc commented on Jan 28, 2026

    @jevansnyc
    CollaboratorAuthor

    There's also a test "X-Custom-Header" being set here that should be removed.

  3. changed the title [-]Synthetic ID Header [X-Psid-Ts] is not being set on /integration re-hosted into first party publisher domain[/-] [+]Synthetic ID Header [X-Synthetic-Id] is not being set on /integration re-hosted into first party publisher domain[/+] on Feb 5, 2026
  4. changed the title [-]Synthetic ID Header [X-Synthetic-Id] is not being set on /integration re-hosted into first party publisher domain[/-] [+]Synthetic ID Header [x-synthetic-id] is not being set on /integration re-hosted into first party publisher domain[/+] on Feb 5, 2026
  5. added a commit that references this issue on Feb 6, 2026
    51f6fc7
  6. added a commit that references this issue on Feb 21, 2026
    08634ca
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