Update API versioning ref docs for client side

Closes: gh-34569

framework-docs/modules/ROOT/pages/integration/rest-clients.adoc

@@ -23,7 +23,8 @@ It also exposes a `builder()` with further options:
 - select the HTTP library to use, see <<rest-request-factories>>
 - configure message converters, see <<rest-message-conversion>>
 - set a baseUrl
-- set default request headers, cookies, path variables
+- set default request headers, cookies, path variables, API version
+- configure an `ApiVersionInserter`
 - register interceptors
 - register request initializers
 
@@ -46,6 +47,8 @@ Java::
 		.defaultUriVariables(Map.of("variable", "foo"))
 		.defaultHeader("My-Header", "Foo")
 		.defaultCookie("My-Cookie", "Bar")
+		.defaultVersion("1.2")
+		.apiVersionInserter(ApiVersionInserter.fromHeader("API-Version").build())
 		.requestInterceptor(myCustomInterceptor)
 		.requestInitializer(myCustomInitializer)
 		.build();
@@ -64,6 +67,8 @@ Kotlin::
 		.defaultUriVariables(mapOf("variable" to "foo"))
 		.defaultHeader("My-Header", "Foo")
 		.defaultCookie("My-Cookie", "Bar")
+        .defaultVersion("1.2")
+        .apiVersionInserter(ApiVersionInserter.fromHeader("API-Version").build())
 		.requestInterceptor(myCustomInterceptor)
 		.requestInitializer(myCustomInitializer)
 		.build()
@@ -115,6 +120,7 @@ For more details on working with and encoding URIs, see xref:web/webmvc/mvc-uri-
 
 If necessary, the HTTP request can be manipulated by adding request headers with `header(String, String)`, `headers(Consumer<HttpHeaders>`, or with the convenience methods `accept(MediaType...)`, `acceptCharset(Charset...)` and so on.
 For HTTP requests that can contain a body (`POST`, `PUT`, and `PATCH`), additional methods are available: `contentType(MediaType)`, and `contentLength(long)`.
+You can set an API version for the request if the client is configured with `ApiVersionInserter`.
 
 The request body itself can be set by `body(Object)`, which internally uses <<rest-message-conversion>>.
 Alternatively, the request body can be set using a `ParameterizedTypeReference`, allowing you to use generics.

framework-docs/modules/ROOT/pages/testing/webtestclient.adoc

@@ -265,6 +265,7 @@ Java::
 	client = WebTestClient.bindToController(new TestController())
 			.configureClient()
 			.baseUrl("/test")
+			.apiVersionInserter(ApiVersionInserter.fromHeader("API-Version").build())
 			.build();
 ----
 
@@ -275,6 +276,7 @@ Kotlin::
 	client = WebTestClient.bindToController(TestController())
 			.configureClient()
 			.baseUrl("/test")
+			.apiVersionInserter(ApiVersionInserter.fromHeader("API-Version").build())
 			.build()
 ----
 ======

framework-docs/modules/ROOT/pages/web/webflux-versioning.adoc

@@ -13,6 +13,11 @@ Please, see also related content in:
 to map requests to annotated controller methods
 - Configure API versioning in xref:web/webflux/config.adoc#webflux-config-api-version[WebFlux Config]
 
+TIP: API versioning is also supported on the client side in `RestClient`, `WebClient`, and
+xref:integration/rest-clients.adoc#rest-http-interface[HTTP Service] clients, as well as
+for testing with `WebTestClient`.
+
+
 
 
 [[webflux-versioning-strategy]]

framework-docs/modules/ROOT/pages/web/webflux-webclient/client-builder.adoc

@@ -1,7 +1,7 @@
 [[webflux-client-builder]]
 = Configuration
 
-The simplest way to create a `WebClient` is through one of the static factory methods:
+The simplest way to create `WebClient` is through one of the static factory methods:
 
 * `WebClient.create()`
 * `WebClient.create(String baseUrl)`
@@ -12,10 +12,12 @@ You can also use `WebClient.builder()` with further options:
 * `defaultUriVariables`: default values to use when expanding URI templates.
 * `defaultHeader`: Headers for every request.
 * `defaultCookie`: Cookies for every request.
+* `defaultApiVersion`: API version for every request.
 * `defaultRequest`: `Consumer` to customize every request.
 * `filter`: Client filter for every request.
 * `exchangeStrategies`: HTTP message reader/writer customizations.
 * `clientConnector`: HTTP client library settings.
+* `apiVersionInserter`: to insert API version values in the request
 * `observationRegistry`: the registry to use for enabling xref:integration/observability.adoc#http-client.webclient[Observability support].
 * `observationConvention`: xref:integration/observability.adoc#config[an optional, custom convention to extract metadata] for recorded observations.
 

framework-docs/modules/ROOT/pages/web/webmvc-versioning.adoc

@@ -13,6 +13,10 @@ Please, see also related content in:
 to map requests to annotated controller methods
 - Configure API versioning in xref:web/webmvc/mvc-config/api-version.adoc[MVC Config]
 
+TIP: API versioning is also supported on the client side in `RestClient`, `WebClient`, and
+xref:integration/rest-clients.adoc#rest-http-interface[HTTP Service] clients, as well as
+for testing with `WebTestClient`.
+