Remove deprecations

spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/flux/FunctionController.java

@@ -179,9 +179,9 @@ public Mono<ResponseEntity<?>> get(ServerWebExchange request) {
 	private FunctionWrapper wrapper(ServerWebExchange request) {
 		FunctionInvocationWrapper function = (FunctionInvocationWrapper) request
 				.getAttribute(WebRequestConstants.HANDLER);
-		HttpHeaders headers = HttpHeaders.writableHttpHeaders(request.getRequest().getHeaders());
+		HttpHeaders headers = new HttpHeaders(request.getRequest().getHeaders());
 		headers.set("uri", request.getRequest().getURI().toString());
-		FunctionWrapper wrapper = new FunctionWrapper(function);
+		FunctionWrapper wrapper = new FunctionWrapper(function, null);
 		wrapper.setHeaders(headers);
 		wrapper.getParams().addAll(request.getRequest().getQueryParams());
 		String argument = (String) request.getAttribute(WebRequestConstants.ARGUMENT);

spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/function/FunctionEndpointInitializer.java

@@ -244,7 +244,7 @@ public <T> RouterFunction<?> functionEndpoints() {
 			FunctionInvocationWrapper funcWrapper = extract(request);
 			Class<?> outputType = funcWrapper == null ? Object.class
 					: FunctionTypeUtils.getRawType(FunctionTypeUtils.getGenericType(funcWrapper.getOutputType()));
-			FunctionWrapper wrapper = new FunctionWrapper(funcWrapper);
+			FunctionWrapper wrapper = new FunctionWrapper(funcWrapper, null);
 			Mono<ResponseEntity<?>> stream = request.bodyToMono(String.class)
 					.flatMap(content -> (Mono<ResponseEntity<?>>) FunctionWebRequestProcessingHelper.processRequest(wrapper, content, false,
 							functionHttpProperties.getIgnoredHeaders(), functionHttpProperties.getRequestOnlyHeaders()));
@@ -270,7 +270,7 @@ public <T> RouterFunction<?> functionEndpoints() {
 				return ServerResponse.ok().body(result, outputType);
 			}
 			else {
-				FunctionWrapper wrapper = new FunctionWrapper(funcWrapper);
+				FunctionWrapper wrapper = new FunctionWrapper(funcWrapper, null);
 
 				wrapper.setHeaders(request.headers().asHttpHeaders());
 				String argument = (String) request.attribute(WebRequestConstants.ARGUMENT).get();

spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/util/FunctionWrapper.java

@@ -39,16 +39,6 @@ public class FunctionWrapper {
 
 	private final String method;
 
-	/**
-	 *
-	 * @param function instance of {@link FunctionInvocationWrapper}
-	 * @deprecated since 4.0.4 in favor of the constructor that takes Http method as second argument.
-	 */
-	@Deprecated
-	public FunctionWrapper(FunctionInvocationWrapper function) {
-		this(function, null);
-	}
-
 	public FunctionWrapper(FunctionInvocationWrapper function, String method) {
 		this.function = function;
 		this.method = method;