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---
stage: Create
group: Source Code
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
---
# Create: Source Code Backend
The Create:Source Code BE team focuses on the GitLab suite of Source Code Management
(SCM) tools. It is responsible for all backend aspects of the product categories
that fall under the [Source Code group](https://about.gitlab.com/handbook/product/categories/#source-code-group)
of the [Create stage](https://about.gitlab.com/handbook/product/categories/#create-stage)
of the [DevOps lifecycle](https://about.gitlab.com/handbook/product/categories/#devops-stages).
We interface with the Gitaly and Code Review teams, and work closely with the
[Create:Source Code Frontend team](https://about.gitlab.com/handbook/engineering/development/dev/create-source-code-fe). The features
we work with are listed on the
[Features by Group Page](https://about.gitlab.com/handbook/product/categories/features/#createsource-code-group).
The team works across three codebases: Workhorse, GitLab Shell and GitLab Rails.
## Workhorse
GitLab Workhorse is a smart reverse proxy for GitLab. It handles "large" HTTP
requests such as file downloads, file uploads, `git push`, `git pull` and `git` archive downloads.
Workhorse itself is not a feature, but there are several features in GitLab
that would not work efficiently without Workhorse.
Workhorse documentation is available in the [Workhorse repository](https://gitlab.com/gitlab-org/gitlab/tree/master/workhorse).
## GitLab Shell
GitLab Shell handles Git SSH sessions for GitLab and modifies the list of authorized keys.
For more information, [refer to the README](https://gitlab.com/gitlab-org/gitlab-shell/-/blob/main/README.md).
for GitLab Shell.
## GitLab Rails
### Source code API endpoints
| Endpoint | Threshold | Source |
| -----------------------------------------------------------------------------------|---------------------------------------|--------------------------------------------------------------------------------------|
| `DELETE /api/:version/projects/:id/protected_branches/:name` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/protected_branches.rb) |
| `GET /api/:version/internal/authorized_keys` | `:high` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/base.rb) | | |
| `GET /api/:version/internal/lfs` | `:high` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/lfs.rb)|
| `GET /api/:version/projects/:id/approval_rules` | `:low` | |
| `GET /api/:version/projects/:id/approval_settings` | default | |
| `GET /api/:version/projects/:id/approvals` | default | |
| `GET /api/:version/projects/:id/forks` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/projects.rb) |
| `GET /api/:version/projects/:id/groups` | default | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/projects.rb) |
| `GET /api/:version/projects/:id/languages` | `:medium` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/projects.rb) |
| `GET /api/:version/projects/:id/merge_request_approval_setting` | `:medium` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/api/merge_request_approval_settings.rb) |
| `GET /api/:version/projects/:id/merge_requests/:merge_request_iid/approval_rules` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/api/merge_request_approval_rules.rb) |
| `GET /api/:version/projects/:id/merge_requests/:merge_request_iid/approval_settings` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/api/project_approval_settings.rb) |
| `GET /api/:version/projects/:id/merge_requests/:merge_request_iid/approval_state` | `:low` | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/merge_request_approvals.rb) |
| `GET /api/:version/projects/:id/merge_requests/:merge_request_iid/approvals` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/merge_request_approvals.rb) |
| `GET /api/:version/projects/:id/protected_branches` | default |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/protected_branches.rb) |
| `GET /api/:version/projects/:id/protected_branches/:name` | default |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/protected_branches.rb) |
| `GET /api/:version/projects/:id/protected_tags` | default | |
| `GET /api/:version/projects/:id/protected_tags/:name` | default | |
| `GET /api/:version/projects/:id/push_rule` | default | |
| `GET /api/:version/projects/:id/remote_mirrors` | default | |
| `GET /api/:version/projects/:id/repository/archive` | default | |
| `GET /api/:version/projects/:id/repository/blobs/:sha` | default | |
| `GET /api/:version/projects/:id/repository/blobs/:sha/raw` | default | |
| `GET /api/:version/projects/:id/repository/branches` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/branches.rb) |
| `GET /api/:version/projects/:id/repository/branches/:branch` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/branches.rb) |
| `GET /api/:version/projects/:id/repository/commits` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb)|
| `GET /api/:version/projects/:id/repository/commits/:sha` | default | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb) |
| `GET /api/:version/projects/:id/repository/commits/:sha/comments` | default | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb) |
| `GET /api/:version/projects/:id/repository/commits/:sha/diff` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb) |
| `GET /api/:version/projects/:id/repository/commits/:sha/merge_requests` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb)|
| `GET /api/:version/projects/:id/repository/commits/:sha/refs` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb) |
| `GET /api/:version/projects/:id/repository/compare` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/repositories.rb) |
| `GET /api/:version/projects/:id/repository/contributors` | default | |
| `GET /api/:version/projects/:id/repository/files/:file_path` | default | |
| `GET /api/:version/projects/:id/repository/files/:file_path/raw` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/files.rb) |
| `GET /api/:version/projects/:id/repository/tags` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/tags.rb) |
| `GET /api/:version/projects/:id/repository/tree` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/repositories.rb) |
| `GET /api/:version/projects/:id/statistics` | default | |
| `GraphqlController#execute` | default | |
| `HEAD /api/:version/projects/:id/repository/files/:file_path` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/files.rb) |
| `HEAD /api/:version/projects/:id/repository/files/:file_path/raw` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/files.rb) |
| `POST /api/:version/internal/allowed` | default | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/base.rb) |
| `POST /api/:version/internal/lfs_authenticate` | `:high` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/base.rb) |
| `POST /api/:version/internal/post_receive` | default | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/base.rb) |
| `POST /api/:version/internal/pre_receive` | `:high` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/internal/base.rb) |
| `POST /api/:version/projects/:id/approvals` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/api/project_approvals.rb) |
| `POST /api/:version/projects/:id/merge_requests/:merge_request_iid/approvals` | `:low` | [source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/merge_request_approvals.rb) |
| `POST /api/:version/projects/:id/merge_requests/:merge_request_iid/approve` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/merge_request_approvals.rb) |
| `POST /api/:version/projects/:id/merge_requests/:merge_request_iid/unapprove` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/merge_request_approvals.rb)|
| `POST /api/:version/projects/:id/protected_branches` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/protected_branches.rb)|
| `POST /api/:version/projects/:id/repository/commits` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/commits.rb)|
| `POST /api/:version/projects/:id/repository/files/:file_path` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/files.rb) |
| `PUT /api/:version/projects/:id/push_rule` | default | |
| `PUT /api/:version/projects/:id/repository/files/:file_path` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/files.rb) |
| `Projects::BlameController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blame_controller.rb) |
| `Projects::BlobController#create` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blob_controller.rb) |
| `Projects::BlobController#diff` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blob_controller.rb) |
| `Projects::BlobController#edit` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blob_controller.rb) |
| `Projects::BlobController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blob_controller.rb) |
| `Projects::BlobController#update` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/blob_controller.rb) |
| `Projects::BranchesController#create` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/branches_controller.rb) |
| `Projects::BranchesController#destroy` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/branches_controller.rb) |
| `Projects::BranchesController#diverging_commit_counts` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/branches_controller.rb) |
| `Projects::BranchesController#index` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/branches_controller.rb) |
| `Projects::BranchesController#new` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/branches_controller.rb) |
| `Projects::CommitController#branches` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commit_controller.rb) |
| `Projects::CommitController#merge_requests` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commit_controller.rb) |
| `Projects::CommitController#pipelines` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commit_controller.rb) |
| `Projects::CommitController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commit_controller.rb) |
| `Projects::CommitsController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commits_controller.rb)|
| `Projects::CommitsController#signatures` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commits_controller.rb) |
| `Projects::CompareController#create` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/commits_controller.rb) |
| `Projects::CompareController#index` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/compare_controller.rb) |
| `Projects::CompareController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/compare_controller.rb) |
| `Projects::CompareController#signatures` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/compare_controller.rb) |
| `Projects::FindFileController#list` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/find_file_controller.rb) |
| `Projects::FindFileController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/find_file_controller.rb) |
| `Projects::ForksController#index` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/forks_controller.rb) |
| `Projects::GraphsController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/graphs_controller.rb) |
| `Projects::NetworkController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/network_controller.rb) |
| `Projects::PathLocksController#index` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/controllers/projects/path_locks_controller.rb) |
| `Projects::RawController#show` | default | |
| `Projects::RefsController#logs_tree` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/refs_controller.rb) |
| `Projects::RefsController#switch` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/refs_controller.rb) |
| `Projects::RepositoriesController#archive` | default | |
| `Projects::Settings::RepositoryController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/settings/repository_controller.rb) |
| `Projects::TagsController#index` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/tags_controller.rb) |
| `Projects::TagsController#new` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/tags_controller.rb) |
| `Projects::TagsController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/tags_controller.rb) |
| `Projects::TemplatesController#names` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/templates_controller.rb) |
| `Projects::TreeController#show` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects/tree_controller.rb) |
| `ProjectsController#refs` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/projects_controller.rb) |
| `Repositories::GitHttpController#git_receive_pack` | default | |
| `Repositories::GitHttpController#git_upload_pack` | default | |
| `Repositories::GitHttpController#info_refs` | default | |
| `Repositories::LfsApiController#batch` | `:medium` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/repositories/lfs_api_controller.rb) |
| `Repositories::LfsLocksApiController#verify` | default | |
| `Repositories::LfsStorageController#download` | `:medium` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/repositories/lfs_storage_controller.rb) |
| `Repositories::LfsStorageController#upload_authorize` | `:medium` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/repositories/lfs_storage_controller.rb) |
| `Repositories::LfsStorageController#upload_finalize` | `:low` |[source](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/controllers/repositories/lfs_storage_controller.rb) |
|
