API: new contract

Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>

docs/content/operations/api.md

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+# API
+
+Traefik exposes a number of information through an API handler, such as the configuration of all routers, services, middlewares, etc.
+
+As with all features of Traefik, this handler can be enabled with the [static configuration](../getting-started/configuration-overview.md#the-static-configuration).
+
+## Security
+
+Enabling the API in production is not recommended, because it will expose all configuration elements,
+including sensitive data.
+
+In production, it should be at least secured by authentication and authorizations.
+
+A good sane default (non exhaustive) set of recommendations
+would be to apply the following protection mechanisms:
+
+* At the application level:  
+  securing with middlewares such as [basic authentication](../middlewares/basicauth.md) or [white listing](../middlewares/ipwhitelist.md).
+
+* At the transport level:  
+  NOT publicly exposing the API's port,
+  keeping it restricted to internal networks
+  (as in the [principle of least privilege](https://en.wikipedia.org/wiki/Principle_of_least_privilege), applied to networks).
+
+## Configuration
+
+To enable the API handler:
+
+```toml tab="File"
+[api]
+```
+
+```bash tab="CLI"
+--api
+```
+
+### `dashboard`
+
+_Optional, Default=true_
+
+Enable the dashboard. More about the dashboard features [here](./dashboard.md).
+
+```toml tab="File"
+[api]
+  dashboard = true
+```
+
+```bash tab="CLI"
+--api.dashboard
+```
+
+### `entrypoint`
+
+_Optional, Default="traefik"_
+
+The entry point that the API handler will be bound to.
+The default ("traefik") is an internal entry point (which is always defined).
+
+```toml tab="File"
+[api]
+  entrypoint = "web"
+```
+
+```bash tab="CLI"
+--api.entrypoint="web"
+```
+
+### `middlewares`
+
+_Optional, Default=empty_
+
+The list of [middlewares](../middlewares/overview.md) applied to the API handler.
+
+```toml tab="File"
+[api]
+  middlewares = ["api-auth", "api-prefix"]
+```
+
+```bash tab="CLI"
+--api.middlewares="api-auth,api-prefix"
+```
+
+### `debug`
+
+_Optional, Default=false_
+
+Enable additional endpoints for debugging and profiling, served under `/debug/`.
+
+```toml tab="File"
+[api]
+  debug = true
+```
+
+```bash tab="CLI"
+--api.debug=true
+```
+
+## Endpoints
+
+All the following endpoints must be accessed with a `GET` HTTP request.
+
+| Path                           | Description                                                                               |
+|--------------------------------|-------------------------------------------------------------------------------------------|
+| `/api/http/routers`            | Lists all the HTTP routers information.                                                   |
+| `/api/http/routers/{name}`     | Returns the information of the HTTP router specified by `name`.                           |
+| `/api/http/services`           | Lists all the HTTP services information.                                                  |
+| `/api/http/services/{name}`    | Returns the information of the HTTP service specified by `name`.                          |
+| `/api/http/middlewares`        | Lists all the HTTP middlewares information.                                               |
+| `/api/http/middlewares/{name}` | Returns the information of the HTTP middleware specified by `name`.                       |
+| `/api/tcp/routers`             | Lists all the TCP routers information.                                                    |
+| `/api/tcp/routers/{name}`      | Returns the information of the TCP router specified by `name`.                            |
+| `/api/tcp/services`            | Lists all the TCP services information.                                                   |
+| `/api/tcp/services/{name}`     | Returns the information of the TCP service specified by `name`.                           |
+| `/api/version`                 | Returns information about Traefik version.                                                |
+| `/debug/vars`                  | See the [expvar](https://golang.org/pkg/expvar/) Go documentation.                        |
+| `/debug/pprof/`                | See the [pprof Index](https://golang.org/pkg/net/http/pprof/#Index) Go documentation.     |
+| `/debug/pprof/cmdline`         | See the [pprof Cmdline](https://golang.org/pkg/net/http/pprof/#Cmdline) Go documentation. |
+| `/debug/pprof/profile`         | See the [pprof Profile](https://golang.org/pkg/net/http/pprof/#Profile) Go documentation. |
+| `/debug/pprof/symbol`          | See the [pprof Symbol](https://golang.org/pkg/net/http/pprof/#Symbol) Go documentation.   |
+| `/debug/pprof/trace`           | See the [pprof Trace](https://golang.org/pkg/net/http/pprof/#Trace) Go documentation.     |
+
+## Common Configuration Use Cases
+
+### Address / Port
+
+You can define a custom address/port like this:
+
+```toml
+[entryPoints]
+  [entryPoints.web]
+  address = ":80"
+
+  [entryPoints.foo]
+  address = ":8082"
+
+  [entryPoints.bar]
+  address = ":8083"
+
+[ping]
+entryPoint = "foo"
+
+[api]
+entryPoint = "bar"
+```
+
+In the above example, you would access a service at /foo, an api endpoint, or the health-check as follows:
+
+* Service: `http://hostname:80/foo`
+* API: `http://hostname:8083/api/http/routers`
+* Ping URL: `http://hostname:8082/ping`
+
+### Authentication
+
+To restrict access to the API handler, one can add authentication with the [basic auth middleware](../middlewares/basicauth.md).
+
+```toml
+[api]
+  middlewares=["api-auth"]
+```
+
+```toml
+[http.middlewares]
+  [http.middlewares.api-auth.basicauth]
+  users = [
+    "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/",
+    "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0",
+  ]
+```

docs/content/operations/debug-mode.md

@@ -1,15 +0,0 @@
-# The Debug Mode
-
-Getting More Information (Not For Production)
-{: .subtitle }
-
-The debug mode will make Traefik be _extremely_ verbose in its logs, and is NOT intended for production purposes.
-
-## Configuration Example
-
-??? example "TOML -- Enabling the Debug Mode"
-
-    ```toml
-    [Global]
-       debug = true
-    ```