diff --git a/mcp/src/main/java/io/modelcontextprotocol/client/transport/FlowSseClient.java b/mcp/src/main/java/io/modelcontextprotocol/client/transport/FlowSseClient.java
index 50af35c70..abfafa551 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/client/transport/FlowSseClient.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/client/transport/FlowSseClient.java
@@ -121,7 +121,8 @@ public FlowSseClient(HttpClient httpClient, HttpRequest.Builder requestBuilder)
 	 * @throws RuntimeException if the connection fails with a non-200 status code
 	 */
 	public void subscribe(String url, SseEventHandler eventHandler) {
-		HttpRequest request = this.requestBuilder.uri(URI.create(url))
+		HttpRequest request = this.requestBuilder.copy()
+			.uri(URI.create(url))
 			.header("Accept", "text/event-stream")
 			.header("Cache-Control", "no-cache")
 			.GET()
diff --git a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
index 99cf2a625..d951349d1 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
@@ -415,7 +415,8 @@ public Mono<Void> sendMessage(JSONRPCMessage message) {
 		try {
 			String jsonText = this.objectMapper.writeValueAsString(message);
 			URI requestUri = Utils.resolveUri(baseUri, endpoint);
-			HttpRequest request = this.requestBuilder.uri(requestUri)
+			HttpRequest request = this.requestBuilder.copy()
+				.uri(requestUri)
 				.POST(HttpRequest.BodyPublishers.ofString(jsonText))
 				.build();