diff --git a/spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/handler/RestClientProxyExchange.java b/spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/handler/RestClientProxyExchange.java
index 37493b6b33..1ace512684 100644
--- a/spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/handler/RestClientProxyExchange.java
+++ b/spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/handler/RestClientProxyExchange.java
@@ -22,12 +22,14 @@
 
 import org.springframework.cloud.gateway.server.mvc.common.MvcUtils;
 import org.springframework.http.client.ClientHttpResponse;
-import org.springframework.util.StreamUtils;
+import org.springframework.util.Assert;
 import org.springframework.web.client.RestClient;
 import org.springframework.web.servlet.function.ServerResponse;
 
 public class RestClientProxyExchange implements ProxyExchange {
 
+	private static final int BUFFER_SIZE = 16384;
+
 	private final RestClient restClient;
 
 	public RestClientProxyExchange(RestClient restClient) {
@@ -44,7 +46,33 @@ public ServerResponse exchange(Request request) {
 	}
 
 	private static int copyBody(Request request, OutputStream outputStream) throws IOException {
-		return StreamUtils.copy(request.getServerRequest().servletRequest().getInputStream(), outputStream);
+		return copy(request.getServerRequest().servletRequest().getInputStream(), outputStream);
+	}
+
+	private static int copy(InputStream inputStream, OutputStream outputStream) throws IOException {
+		Assert.notNull(inputStream, "No InputStream specified");
+		Assert.notNull(outputStream, "No OutputStream specified");
+
+		int readBytes;
+		var totalReadBytes = 0;
+		var buffer = new byte[BUFFER_SIZE];
+
+		while ((readBytes = inputStream.read(buffer)) != -1) {
+			outputStream.write(buffer, 0, readBytes);
+			outputStream.flush();
+			if (totalReadBytes < Integer.MAX_VALUE) {
+				try {
+					totalReadBytes = Math.addExact(totalReadBytes, readBytes);
+				}
+				catch (ArithmeticException e) {
+					totalReadBytes = Integer.MAX_VALUE;
+				}
+			}
+		}
+
+		outputStream.flush();
+
+		return totalReadBytes;
 	}
 
 	private static ServerResponse doExchange(Request request, ClientHttpResponse clientResponse) throws IOException {
@@ -59,7 +87,7 @@ private static ServerResponse doExchange(Request request, ClientHttpResponse cli
 					InputStream inputStream = MvcUtils.getAttribute(request.getServerRequest(),
 							MvcUtils.CLIENT_RESPONSE_INPUT_STREAM_ATTR);
 					// copy body from request to clientHttpRequest
-					StreamUtils.copy(inputStream, httpServletResponse.getOutputStream());
+					copy(inputStream, httpServletResponse.getOutputStream());
 				}
 				return null;
 			});