From 00cb9203cd17fcb73284340bb987c2cf9373f87c Mon Sep 17 00:00:00 2001
From: Basil Hosmer <basil@anthropic.com>
Date: Fri, 16 May 2025 16:48:31 -0400
Subject: [PATCH] fix sse endpoint path preservation

---
 src/client/sse.test.ts | 6 +++---
 src/client/sse.ts      | 8 +-------
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/src/client/sse.test.ts b/src/client/sse.test.ts
index fc7a86c4..b55c7e78 100644
--- a/src/client/sse.test.ts
+++ b/src/client/sse.test.ts
@@ -87,7 +87,7 @@ describe("SSEClientTransport", () => {
       await transport.send(message);
 
       // Verify the POST request maintains the custom path
-      expect(lastServerRequest.url).toBe("/custom/path/messages");
+      expect(lastServerRequest.url).toBe("/custom/path/sse");
     });
 
     it("handles multiple levels of custom paths", async () => {
@@ -107,7 +107,7 @@ describe("SSEClientTransport", () => {
       await transport.send(message);
 
       // Verify the POST request maintains the full custom path
-      expect(lastServerRequest.url).toBe("/api/v1/custom/deep/path/messages");
+      expect(lastServerRequest.url).toBe("/api/v1/custom/deep/path/sse");
     });
 
     it("maintains custom path for SSE connection", async () => {
@@ -130,7 +130,7 @@ describe("SSEClientTransport", () => {
       };
       
       await transport.send(message);
-      expect(lastServerRequest.url).toBe("/custom/path/messages");
+      expect(lastServerRequest.url).toBe("/custom/path/sse");
     });
 
     it("establishes SSE connection and receives endpoint", async () => {
diff --git a/src/client/sse.ts b/src/client/sse.ts
index 1e481773..755f5da7 100644
--- a/src/client/sse.ts
+++ b/src/client/sse.ts
@@ -147,13 +147,7 @@ export class SSEClientTransport implements Transport {
           this._endpoint = new URL(messageEvent.data, this._url);
           
           // If the original URL had a custom path, preserve it in the endpoint URL
-          const originalPath = this._url.pathname;
-          if (originalPath && originalPath !== '/' && originalPath !== '/sse') {
-            // Extract the base path from the original URL (everything before the /sse suffix)
-            const basePath = originalPath.replace(/\/sse$/, '');
-            // The endpoint should use the same base path but with /messages instead of /sse
-            this._endpoint.pathname = basePath + '/messages';
-          }
+          this._endpoint.pathname = this._url.pathname;
           
           if (this._endpoint.origin !== this._url.origin) {
             throw new Error(