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---
stage: Create
group: Editor Extensions
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
description: "Learn about the GitLab Language Server."
---
# GitLab Language Server
The [GitLab Language Server](https://gitlab.com/gitlab-org/editor-extensions/gitlab-lsp)
powers various GitLab editor extensions across IDEs.
## Configure the Language Server to use a proxy
The `gitlab-lsp` child process uses the [`proxy-from-env`](https://www.npmjs.com/package/proxy-from-env?activeTab=readme)
NPM module to determine proxy settings from these environment variables:
- `NO_PROXY`
- `HTTPS_PROXY`
- `http_proxy` (in lower case)
To configure the Language Server to use a proxy:
::Tabs
:::TabTitle Visual Studio Code
1. In Visual Studio Code, open your [user or workspace settings](https://code.visualstudio.com/docs/getstarted/settings).
1. Configure [`http.proxy`](https://code.visualstudio.com/docs/setup/network#_legacy-proxy-server-support)
to point at your HTTP proxy.
1. Restart Visual Studio Code to ensure connections to GitLab use the latest proxy settings.
:::TabTitle JetBrains IDEs
1. In your JetBrains IDE, configure the [HTTP Proxy](https://www.jetbrains.com/help/idea/settings-http-proxy.html) settings.
1. Restart your IDE to ensure connections to GitLab use the latest proxy settings.
1. From the **Tools > GitLab Duo** menu, select **Verify setup**. Make sure the health check passes.
::EndTabs
## Troubleshooting
### Enable proxy authentication
You might encounter a `407 Access Denied (authentication_failed)` error when using an authenticated proxy:
```plaintext
Request failed: Can't add GitLab account for https://gitlab.com. Check your instance URL and network connection.
Fetching resource from https://gitlab.com/api/v4/personal_access_tokens/self failed
```
To enable proxy authentication in the Language Server, follow the steps for your IDE:
::Tabs
:::TabTitle Visual Studio Code
1. Open your user or workspace [settings](https://code.visualstudio.com/docs/getstarted/settings).
1. Configure [`http.proxy`](https://code.visualstudio.com/docs/setup/network#_legacy-proxy-server-support),
including username and password, to authenticate with your HTTP proxy.
1. Restart Visual Studio Code to ensure connections to GitLab use the latest proxy settings.
NOTE:
The VS Code extension does not support the legacy
[`http.proxyAuthorization`](https://code.visualstudio.com/docs/setup/network#_legacy-proxy-server-support)
setting in VS Code for authenticating the language server with an HTTP proxy. Support is proposed in
[issue 1672](https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/issues/1672).
:::TabTitle JetBrains IDEs
1. Configure [HTTP Proxy](https://www.jetbrains.com/help/idea/settings-http-proxy.html) settings in your JetBrains IDE.
1. If using **Manual proxy configuration**, enter your credentials under **Proxy authentication** and select **Remember**.
1. Restart your JetBrains IDE to ensure connections to GitLab use the latest proxy settings.
1. From the **Tools > GitLab Duo** menu, select **Verify setup**. Make sure the health check passes.
::EndTabs
NOTE:
Bearer authentication is proposed in [issue 548](https://gitlab.com/gitlab-org/editor-extensions/gitlab-lsp/-/issues/548).
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