Began work on http api docs, #1822

docs/sources/reference/http_api.md

@@ -6,5 +6,135 @@ page_keywords: grafana, admin, http, api, documentation
 
 # HTTP API Reference
 
-This documentation page has yet to be written.
+The Grafana backend exposes an HTTP API, the same API is used by the frontend to do everything from saving
+dashboards, creating users and updating data sources.
+
+## Authorization
+
+Currently you can authenticate via an `API Token` or via a `Session cookie` (acquired using regular login or oauth).
+
+### Create API Token
+
+Open the sidemenu and click the organization dropdown and select the `API Keys` option.
+
+![](/img/v2/orgdropdown_api_keys.png)
+
+You use the token in all requests in the `Authorization` header, like this:
+
+**Example**:
+
+        GET http://your.grafana.com/api/dashboards/db/mydash HTTP/1.1
+        Accept: application/json
+        Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+The `Authorization` header value should be `Bearer <your api key>`.
+
+## Dashboards
+
+### Create or Update dashboard
+
+`POST /api/dashboards/db`
+
+Creates a new dashboard or updates an existing dashboard.
+
+**Example Request for new dashboard**:
+
+        POST /api/dashboards/db HTTP/1.1
+        Accept: application/json
+        Content-Type: application/json
+        Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+        {
+          "dashboard": {
+            "id": null,
+            "title": "Production Overview",
+            "tags": [ "templated" ],
+            "timezone": "browser",
+            "rows": [
+              {
+              }
+            ]
+            "schemaVersion": 6,
+            "version": 0
+          },
+          "overwrite": false
+        }
+
+JSON Body schema:
+
+- **dashboard** – The complete dashboard model, id = null to create a new dashboard
+- **overwrite** – Set to true if you want to overwrite existing dashboard with new version or with same dashboard title.
+
+**Example Response**:
+
+    HTTP/1.1 200 OK
+    Content-Type: application/json; charset=UTF-8
+    Date: Wed, 22 Apr 2015 11:12:06 GMT
+    Content-Length: 78
+
+    {
+      "slug": "production-overview",
+      "status": "success",
+      "version": 1
+    }
+
+Status Codes:
+
+- **200** – Created
+- **400** – Errors (invalid json, missing or invalid fields, etc)
+- **401** – Unauthorized
+- **412** – Precondition failed
+
+The **412** status code is used when a newer dashboard already exists (newer, its version is greater than the verison that was sent). The
+same status code is also used if another dashboar exists with the same title. The response body will look like this:
+
+    HTTP/1.1 412 Precondition Failed
+    Content-Type: application/json; charset=UTF-8
+    Content-Length: 97
+
+    {
+      "message": "The dashboard has been changed by someone else",
+      "status": "version-mismatch"
+    }
+
+In in case of title already exists the `status` property will be `name-exists`.
+
+### Get dashboard
+
+`GET /api/dashboards/db/:slug`
+
+Will return the dashboard given the dashboard slug. Slug is the url friendly version of the dashboard title.
+
+**Example Request**:
+
+        GET /api/dashboards/db/production-overview HTTP/1.1
+        Accept: application/json
+        Content-Type: application/json
+        Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+        {
+          "meta": {
+            "isStarred": false,
+            "slug": "production-overview"
+          },
+          "dashboard": {
+            "id": null,
+            "title": "Production Overview",
+            "tags": [ "templated" ],
+            "timezone": "browser",
+            "rows": [
+              {
+              }
+            ]
+            "schemaVersion": 6,
+            "version": 0
+          },
+        }
+
+## Data sources
+
+## Organizations
+
+## Users
+