add default api versioning

Author: oeggert

docs/references/http-websocket-apis/index.md

@@ -6,11 +6,11 @@ metadata:
 ---
 # HTTP / WebSocket APIs
 
-You can communicate directly with the XRP Ledger by `rippled` servers through the publicly available APIs.
+You can communicate with the XRP Ledger through the `rippled` servers' publicly available APIs.
 
 Currently, there are two API versions: `1` and `2` {% badge href="https://github.com/XRPLF/rippled/releases/tag/2.0.0" %}New in: rippled 2.0.0{% /badge %}. The server reports the range of supported API versions in the `version` API method. <!-- STYLE_OVERRIDE: will --> <!-- TODO: add a link when `version` method is documented. -->
 
-Separate API requests can use different API versions even on the same persistent connection. For example, if you connect WebSocket to a server that supports API versions 1 and 2, you can make an `account_tx` request using API version 2 and then make another `account_tx` request using API version 1 from the same connection.
+Separate API requests can use different API versions even on the same persistent connection. For example, if you connect through WebSocket to a server that supports API versions 1 and 2, you can make an `account_tx` request using API version 2 and then make another `account_tx` request using API version 1 from the same connection.
 
 Future versions of `rippled` that introduce breaking changes will introduce a new API version 3.
 
@@ -43,6 +43,23 @@ The following types of changes are **non-breaking changes** and may occur withou
 - Adding a new field to a request or response, not including positional parameters.
 - Adding a new API method.
 
+
+## Default API Versions
+
+The table below shows which version of the `rippled` API is used if you don't specify it in the request:
+
+| Request Format | API Version | Additional Notes |
+|----------------|-------------|------------------|
+| Websocket      | 1           | |
+| JSON-RPC       | 1           | |
+| Commandline    | 2           | The commandline only uses the latest API version (currently 2). |
+| [xrpl.js](https://github.com/XRPLF/xrpl.js) | 2 | Defaults to [API v2][] starting in v4.0.0. |
+| [xrpl-py](https://github.com/XRPLF/xrpl-py) | 2 | Defaults to [API v2][] starting in v3.0.0. |
+
+{% admonition type="info" name="Note" %}
+[API v2][] is used by default when you make a request to a Clio server, starting in v???.
+{% /admonition %}
+
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