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docs/source/reference/server-api.md
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# Starting servers with the JupyterHub API
Sometimes, when working with applications such as [BinderHub](https://binderhub.readthedocs.io), it may be necessary to launch Jupyter-based services on behalf of your users.
Doing so can be achieved through JupyterHub's [REST API](../reference/rest.md), which allows one to launch and manage servers on behalf of users through API calls instead of the JupyterHub UI.
Sometimes, when working with applications such as [BinderHub](https://binderhub.readthedocs.io), it may be necessary to launch Jupyter-based services on behalf of your users.
Doing so can be achieved through JupyterHub's [REST API](../reference/rest.md), which allows one to launch and manage servers on behalf of users through API calls instead of the JupyterHub UI.
This way, you can take advantage of other user/launch/lifecycle patterns that are not natively supported by the JupyterHub UI, all without the need to develop the server management features of JupyterHub Spawners and/or Authenticators.
This tutorial goes through working with the JupyterHub API to manage servers for users.
This tutorial goes through working with the JupyterHub API to manage servers for users.
In particular, it covers how to:
1. [Check the status of servers](checking)
@@ -177,7 +177,7 @@ You can keep making this check until `ready` is true.
### Using the progress API
The most _efficient_ way to wait for a server to start is by using the progress API.
The most _efficient_ way to wait for a server to start is by using the progress API.
The progress URL is available in the server model under `progress_url` and has the form `/hub/api/users/:user/servers/:servername/progress`.
The default server progress can be accessed at `:user/servers//progress` or `:user/server/progress` as demonstrated in the following GET request:
@@ -188,7 +188,7 @@ GET /hub/api/users/:user/servers/:servername/progress
**Required scope: `read:servers`**
The progress API is an example of an [EventStream][] API.
The progress API is an example of an [EventStream][] API.
Messages are _streamed_ and delivered in the form:
```
@@ -223,7 +223,7 @@ ready
url
: only present if `ready` is true; will be the server's URL
The progress API can be used even with fully ready servers.
The progress API can be used even with fully ready servers.
If the server is ready, there will only be one event, which will look like:
```json
@@ -238,7 +238,7 @@ If the server is ready, there will only be one event, which will look like:
where `ready` and `url` are the same as in the server model, and `ready` will always be true.
A significant advantage of the progress API is that it shows the status of the server through a stream of messages.
A significant advantage of the progress API is that it shows the status of the server through a stream of messages.
Below is an example of a typical complete stream from the API:
```
@@ -269,7 +269,7 @@ DELETE /hub/api/users/:user/servers/[:servername]
**Required scope: `servers`**
Similar to when starting a server, issuing the DELETE request above might not stop the server immediately.
Similar to when starting a server, issuing the DELETE request above might not stop the server immediately.
Instead, the DELETE request has two possible response codes:
204 Deleted
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The URL returned from a server model is the URL path suffix,
e.g. `/user/:name/` to append to the jupyterhub base URL.
The returned URL is of the form `{hub_url}{server_url}`,
where `hub_url` would be `http://127.0.0.1:8000` by default and `server_url` is `/user/myname`.
where `hub_url` would be `http://127.0.0.1:8000` by default and `server_url` is `/user/myname`.
When combined, the two give a full URL of `http://127.0.0.1:8000/user/myname`.
## Python example