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`/docs/rest-api/sdk/project-routes/add-a-routing-rule` does not exist. Similar pages:

- [Add a routing rule (Vercel SDK)](/docs/rest-api/sdk/project-routes/add-a-routing-rule.md): POST /v1/projects/{projectId}/routes Add a single routing rule to a project at a specified position. Defaults to the end of the list if no position
- [Edit a routing rule (Vercel SDK)](/docs/rest-api/sdk/project-routes/edit-a-routing-rule.md): PATCH /v1/projects/{projectId}/routes/{routeId} Replace a routing rule identified by its ID, or restore it from the current production version.
- [Add a routing rule](/docs/rest-api/project-routes/add-a-routing-rule.md): POST /v1/projects/{projectId}/routes Add a single routing rule to a project at a specified position. Defaults to the end of the list if no position
- [Stage routing rules (Vercel SDK)](/docs/rest-api/sdk/project-routes/stage-routing-rules.md): PUT /v1/projects/{projectId}/routes Stage routing rules for a project. Set overwrite to true to replace all existing rules, or omit it to merge with
- [Get project routing rules (Vercel SDK)](/docs/rest-api/sdk/project-routes/get-project-routing-rules.md): GET /v1/projects/{projectId}/routes Get the routing rules for a project. Supports searching by name/ID/pattern, filtering by route type, and diffing

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