Allow repeatable writes in Client Interceptors

See gh-31449

spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package org.springframework.http.client;
 
 import java.io.IOException;
+import java.io.OutputStream;
 import java.net.URI;
 import java.util.Iterator;
 import java.util.List;
@@ -92,7 +93,17 @@ class InterceptingClientHttpRequest extends AbstractBufferingClientHttpRequest {
 				request.getHeaders().forEach((key, value) -> delegate.getHeaders().addAll(key, value));
 				if (body.length > 0) {
 					if (delegate instanceof StreamingHttpOutputMessage streamingOutputMessage) {
-						streamingOutputMessage.setBody(outputStream -> StreamUtils.copy(body, outputStream));
+						streamingOutputMessage.setBody(new StreamingHttpOutputMessage.Body() {
+							@Override
+							public void writeTo(OutputStream outputStream) throws IOException {
+								StreamUtils.copy(body, outputStream);
+							}
+
+							@Override
+							public boolean repeatable() {
+								return true;
+							}
+						});
 					}
 					else {
 						StreamUtils.copy(body, delegate.getBody());