---
agentTools:
  projectIndex: https://support.speedcurve.com/llms.txt
---

# Synthetic: Rollback urlpattern filtering for setHeader script command

**7th July 2023 (UTC)**

As a result of the changes on [4th July](https://support.speedcurve.com/changelog/synthetic-add-urlpattern-filtering-to-setheader-and-addheader-commands) some XHR requests were failing when a header was being applied via `setHeader`

We've rolled back the filtering change while we investigate the issue further.