diff --git a/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java b/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
index 07203df37102..31fa53a67f82 100644
--- a/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
+++ b/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
@@ -88,6 +88,16 @@ public ClientHttpResponse execute(HttpRequest request, byte[] body) throws IOExc
 				return nextInterceptor.intercept(request, body, this);
 			}
 			else {
+
+				/*
+				 * After intercepted by the interceptors, the length of the body may change.
+				 * Set the latest body.length to "Content-Length"
+				 */
+				long contentLength = request.getHeaders().getContentLength();
+				if (contentLength > -1 && contentLength != body.length) {
+					request.getHeaders().setContentLength(body.length);
+				}
+
 				HttpMethod method = request.getMethod();
 				ClientHttpRequest delegate = requestFactory.createRequest(request.getURI(), method);
 				request.getHeaders().forEach((key, value) -> delegate.getHeaders().addAll(key, value));
diff --git a/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java b/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
index 2735c00e315f..157c553f644e 100644
--- a/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
+++ b/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
@@ -204,6 +204,9 @@ void changeBody() throws Exception {
 		ClientHttpRequest request = requestFactory.createRequest(URI.create("https://example.com"), HttpMethod.GET);
 		request.execute();
 		assertThat(Arrays.equals(changedBody, requestMock.getBodyAsBytes())).isTrue();
+
+		// When the request body is changed, the "Content-Length" in the request header also needs to be changed.
+		assertThat(requestMock.getHeaders().getContentLength()).isEqualTo(changedBody.length);
 	}