100 lines
3.3 KiB
Markdown
100 lines
3.3 KiB
Markdown
---
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stage: none
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group: unassigned
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# Routing
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The GitLab backend is written primarily with Rails so it uses [Rails
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routing](https://guides.rubyonrails.org/routing.html). Beside Rails best
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practices, there are few rules unique to the GitLab application. To
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support subgroups, GitLab project and group routes use the wildcard
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character to match project and group routes. For example, we might have
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a path such as:
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```plaintext
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/gitlab-com/customer-success/north-america/west/customerA
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```
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However, paths can be ambiguous. Consider the following example:
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```plaintext
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/gitlab-com/edit
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```
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It's ambiguous whether there is a subgroup named `edit` or whether
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this is a special endpoint to edit the `gitlab-com` group.
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To eliminate the ambiguity and to make the backend easier to maintain,
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we introduced the `/-/` scope. The purpose of it is to separate group or
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project paths from the rest of the routes. Also it helps to reduce the
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number of [reserved names](../user/reserved_names.md).
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## Global routes
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We have a number of global routes. For example:
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```plaintext
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/-/health
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/-/metrics
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```
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## Group routes
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Every group route must be under the `/-/` scope.
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Examples:
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```plaintext
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gitlab-org/-/edit
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gitlab-org/-/activity
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gitlab-org/-/security/dashboard
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gitlab-org/serverless/-/activity
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```
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To achieve that, use the `scope '-'` method.
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## Project routes
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Every project route must be under the `/-/` scope, except cases where a Git
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client or other software requires something different.
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Examples:
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```plaintext
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gitlab-org/gitlab/-/activity
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gitlab-org/gitlab/-/jobs/123
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gitlab-org/gitlab/-/settings/repository
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gitlab-org/serverless/runtimes/-/settings/repository
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```
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## Changing existing routes
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Don't change a URL to an existing page, unless it's necessary. If you must make a change,
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make it unnoticeable for users, because we don't want them to receive `404 Not Found`
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if we can avoid it. This table should help:
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| URL description | Example | What to do |
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|---|---|---|
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| Can be used in scripts and automation | `snippet#raw` | Support both an old and new URL for one major release. Then, support a redirect from an old URL to a new URL for another major release. |
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| Likely to be saved or shared | `issue#show` | Add a redirect from an old URL to a new URL until the next major release. |
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| Limited use, unlikely to be shared | `admin#labels` | No extra steps required. |
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## Migrating unscoped routes
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Currently, the majority of routes are placed under the `/-/` scope. However,
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you can help us migrate the rest of them! To migrate routes:
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1. Modify existing routes by adding `-` scope.
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1. Add redirects for legacy routes by using `Gitlab::Routing.redirect_legacy_paths`.
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1. Create a technical debt issue to remove deprecated routes in later releases.
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To get started, see an [example merge request](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/28435).
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## Useful links
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- [Routing improvements master plan](https://gitlab.com/gitlab-org/gitlab/-/issues/215362)
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- [Scoped routing explained](https://gitlab.com/gitlab-org/gitlab/-/issues/214217)
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- [Removal of deprecated routes](https://gitlab.com/gitlab-org/gitlab/-/issues/28848)
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