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docs: api request and placeholders to proxy how-to
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title: How to run the Unleash Proxy
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---
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import ApiRequest from '@site/src/components/ApiRequest'
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:::info Placeholders
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Placeholders in the code samples below are delimited by angle brackets (i.e. `<placeholder-name>`). You will need to replace them with the values that are correct in _your_ situation for the code samples to run properly.
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:::
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The [Unleash Proxy](../sdks/unleash-proxy.md) provides a way for you to consume feature toggles in [front-end clients](../sdks/index.md#front-end-sdks), such as the [JavaScript Proxy client](../sdks/proxy-javascript.md) and [React Proxy client](../sdks/proxy-react.md).
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Depending on your setup, the Proxy is most easily run in one of two ways, depending on your situation:
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- Run the proxy via Docker
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- Run the proxy as a Node.js app
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- [Via Docker](#run-proxy-via-docker)
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- [As a Node.js app](#run-proxy-as-node-app)
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If you're using a hosted version of Unleash, we can also run the proxy for you if you'd rather not run it yourself.
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If you're using a hosted version of Unleash, we can also run the proxy for you.
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## Prerequisites
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This is what you need to do before you can run the proxy
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This is what you need before you can run the proxy:
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- A running Unleash server to connect to
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- A client API token for the proxy to use.
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- if you're running the Proxy via Docker: [the `docker` command line tool](https://www.docker.com/)
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- A running Unleash server to connect to. You'll need its API path (e.g. `https://app.unleash-hosted.com/demo/api`) to connect the proxy to it.
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- A [client API token](../reference/api-tokens-and-client-keys#client-tokens) for the proxy to use.
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- If you're running the Proxy via Docker: [the `docker` command line tool](https://www.docker.com/).
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- If you're running the Proxy as a Node.js app: [Node.js and its command line tools](https://nodejs.org/).
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- A [Proxy client key](../reference/api-tokens-and-client-keys#proxy-client-keys). This can be any arbitrary string (for instance: `proxy-client-key`). Use this key when connecting a client SDK to the Proxy.
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## How to run the Proxy via Docker
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## How to run the Proxy via Docker {#run-proxy-via-docker}
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The easiest way to run Unleash is via Docker. We have published a [docker image on docker hub](https://hub.docker.com/r/unleashorg/unleash-proxy).
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We provide a [Docker image (available on on Docker Hub)](https://hub.docker.com/r/unleashorg/unleash-proxy) that you can use to run the proxy.
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### 1. Pull the Proxy image
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```bash
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docker pull unleashorg/unleash-proxy
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```
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Use the `docker` command to pull the Proxy image:
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### 2. Start the proxy
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```bash title="Pull the Unleash Proxy docker image"
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docker pull unleashorg/unleash-proxy
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```
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```bash
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docker run \
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-e UNLEASH_PROXY_CLIENT_KEYS=some-secret \
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-e UNLEASH_URL='https://app.unleash-hosted.com/demo/api/' \
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-e UNLEASH_API_TOKEN=56907a2fa53c1d16101d509a10b78e36190b0f918d9f122d \
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-p 3000:3000 \
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unleashorg/unleash-proxy
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```
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### 2. Start the Proxy
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You should see the following output:
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When running the Proxy, you'll need to provide it with at least the configuration options listed below. Check the reference docs for the [full list of configuration options](../sdks/unleash-proxy.md#configuration-options).
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```bash
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Unleash-proxy is listening on port 3000!
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```
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```bash title="Run the Unleash Proxy via Docker"
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docker run \
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-e UNLEASH_PROXY_CLIENT_KEYS=<proxy-client-key> \
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-e UNLEASH_URL='<unleash-api-url>' \
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-e UNLEASH_API_TOKEN=<client-api-token> \
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-p 3000:3000 \
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unleashorg/unleash-proxy
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```
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## How to run the Proxy as a Node.js app
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If the proxy starts up successfully, you should see the following output:
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To run the Proxy via Node.js, you'll have to create your own Node.js project and use the Unleash Proxy as a dependency. Assuming you've already set up your project, here's the steps to take to start the proxy as part of your app:
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```bash
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Unleash-proxy is listening on port 3000!
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```
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### 1. Install the Unleash Proxy package
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## How to run the Proxy as a Node.js app {#run-proxy-as-node-app}
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``` shell npm2yarn
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npm install @unleash/proxy
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```
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To run the Proxy via Node.js, you'll have to create your own Node.js project and use the Unleash Proxy as a dependency.
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### 2. Initialize and start the proxy in your code.
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### 1. initialize the project
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A fully working sample app that uses the proxy:
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If you don't already have an existing Node.js project, create one:
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``` js
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const port = 3000;
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``` bash npm2yarn
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npm init
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```
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const { createApp } = require('@unleash/proxy');
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### 2. Install the Unleash Proxy package
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const app = createApp({
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unleashUrl: 'https://app.unleash-hosted.com/demo/api/',
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unleashApiToken: '56907a2fa53c1d16101d509a10b78e36190b0f918d9f122d',
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clientKeys: ['some-secret', 'another-proxy-secret', 's1'],
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refreshInterval: 1000,
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});
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Install the Unleash Proxy as a dependency:
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app.listen(port, () =>
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console.log(`Unleash Proxy listening on http://localhost:${port}/proxy`),
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);
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```
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``` shell npm2yarn
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npm install @unleash/proxy
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```
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### 3. Configure and start the proxy
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Import the `createApp` function from `@unleash/proxy` and configure the proxy. You'll need to provide at least the configuration options highlighted below. Check the reference docs for the [full list of configuration options](../sdks/unleash-proxy.md#configuration-options).
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Here is an example of what running the Proxy as a Node.js app might look like:
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``` js title="Sample app running the Unleash Proxy"
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const port = 3000;
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const { createApp } = require('@unleash/proxy');
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const app = createApp({
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// highlight-start
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unleashUrl: '<unleash-api-url>',
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unleashApiToken: '<client-api-token>',
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clientKeys: ['<proxy-client-key>'],
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// highlight-end
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});
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app.listen(port, () =>
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console.log(`Unleash Proxy listening on http://localhost:${port}/proxy`),
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);
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```
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## Verify that the proxy is working
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In order to verify the proxy you can use curl and see that you get a few evaluated feature toggles back. Assuming that the proxy is running on port 3000 and that your proxy client key is `some-secret`, you could run this command :
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When the proxy process has started up correctly, you can start querying its `/proxy` endpoint. If it's running correctly, you'll get back a JSON object with a list of toggles. The list may be empty if you haven't added any toggles for the corresponding project/environment yet.
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```bash
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curl http://localhost:3000/proxy -H "Authorization: some-secret"
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```
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Check the reference docs for API return values
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<ApiRequest verb="get" url="api/admin/projects/<project-id>/features" title="Request toggles from the Unleash Proxy"/>
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