diff --git a/README.md b/README.md
index 76c45ab9..6843fa7d 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,10 @@ npm install @modelcontextprotocol/sdk
 ```typescript
 import { Client } from "@modelcontextprotocol/sdk/client/index.js";
 import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import {
+  ListResourcesRequestSchema,
+  ReadResourceRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
 
 const transport = new StdioClientTransport({
   command: "path/to/server",
@@ -61,6 +65,10 @@ const resourceContent = await client.request(
 ```typescript
 import { Server } from "@modelcontextprotocol/sdk/server/index.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import {
+  ListResourcesRequestSchema,
+  ReadResourceRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
 
 const server = new Server({
   name: "example-server",
diff --git a/package.json b/package.json
index 4cc75635..c46ea85d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/sdk",
-  "version": "1.0.4",
+  "version": "1.1.0",
   "description": "Model Context Protocol implementation for TypeScript",
   "license": "MIT",
   "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/src/client/sse.ts b/src/client/sse.ts
index e7f0dc6b..0e6e7eb9 100644
--- a/src/client/sse.ts
+++ b/src/client/sse.ts
@@ -12,13 +12,17 @@ export class SSEClientTransport implements Transport {
   private _endpoint?: URL;
   private _abortController?: AbortController;
   private _url: URL;
+  private _eventSourceInit?: EventSourceInit;
+  private _requestInit?: RequestInit;
 
   onclose?: () => void;
   onerror?: (error: Error) => void;
   onmessage?: (message: JSONRPCMessage) => void;
 
-  constructor(url: URL) {
+  constructor(url: URL, opts?: { eventSourceInit?: EventSourceInit, requestInit?: RequestInit }) {
     this._url = url;
+    this._eventSourceInit = opts?.eventSourceInit;
+    this._requestInit = opts?.requestInit;
   }
 
   start(): Promise<void> {
@@ -29,7 +33,7 @@ export class SSEClientTransport implements Transport {
     }
 
     return new Promise((resolve, reject) => {
-      this._eventSource = new EventSource(this._url.href);
+      this._eventSource = new EventSource(this._url.href, this._eventSourceInit);
       this._abortController = new AbortController();
 
       this._eventSource.onerror = (event) => {
@@ -90,14 +94,17 @@ export class SSEClientTransport implements Transport {
     }
 
     try {
-      const response = await fetch(this._endpoint, {
+      const headers = new Headers(this._requestInit?.headers);
+      headers.set("content-type", "application/json");
+      const init = {
+        ...this._requestInit,
         method: "POST",
-        headers: {
-          "Content-Type": "application/json",
-        },
+        headers,
         body: JSON.stringify(message),
-        signal: this._abortController?.signal,
-      });
+        signal: this._abortController?.signal
+      };
+
+      const response = await fetch(this._endpoint, init);
 
       if (!response.ok) {
         const text = await response.text().catch(() => null);
diff --git a/src/shared/protocol.test.ts b/src/shared/protocol.test.ts
new file mode 100644
index 00000000..9423a2a7
--- /dev/null
+++ b/src/shared/protocol.test.ts
@@ -0,0 +1,63 @@
+import { Protocol } from "./protocol.js";
+import { Transport } from "./transport.js";
+import {
+  McpError,
+  ErrorCode,
+  Request,
+  Result,
+  Notification,
+} from "../types.js";
+import { ZodType, z } from "zod";
+
+// Mock Transport class
+class MockTransport implements Transport {
+  onclose?: () => void;
+  onerror?: (error: Error) => void;
+  onmessage?: (message: unknown) => void;
+
+  async start(): Promise<void> {}
+  async close(): Promise<void> {
+    this.onclose?.();
+  }
+  async send(_message: unknown): Promise<void> {}
+}
+
+describe("protocol tests", () => {
+  let protocol: Protocol<Request, Notification, Result>;
+  let transport: MockTransport;
+
+  beforeEach(() => {
+    transport = new MockTransport();
+    protocol = new (class extends Protocol<Request, Notification, Result> {
+      protected assertCapabilityForMethod(): void {}
+      protected assertNotificationCapability(): void {}
+      protected assertRequestHandlerCapability(): void {}
+    })();
+  });
+
+  test("should throw a timeout error if the request exceeds the timeout", async () => {
+    await protocol.connect(transport);
+    const request = { method: "example", params: {} };
+    try {
+      const mockSchema: ZodType<{ result: string }> = z.object({
+        result: z.string(),
+      });
+      await protocol.request(request, mockSchema, {
+        timeout: 0,
+      });
+    } catch (error) {
+      expect(error).toBeInstanceOf(McpError);
+      if (error instanceof McpError) {
+        expect(error.code).toBe(ErrorCode.RequestTimeout);
+      }
+    }
+  });
+
+  test("should invoke onclose when the connection is closed", async () => {
+    const oncloseMock = jest.fn();
+    protocol.onclose = oncloseMock;
+    await protocol.connect(transport);
+    await transport.close();
+    expect(oncloseMock).toHaveBeenCalled();
+  });
+});
diff --git a/src/types.ts b/src/types.ts
index 44a44d8f..59b055a8 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -100,13 +100,13 @@ export const JSONRPCResponseSchema = z
   .strict();
 
 /**
- * An incomplete set of error codes that may appear in JSON-RPC responses.
+ * Error codes defined by the JSON-RPC specification.
  */
 export enum ErrorCode {
   // SDK error codes
-  ConnectionClosed = -1,
-  RequestTimeout = -2,
-
+  ConnectionClosed = -32000,
+  RequestTimeout = -32001,
+ 
   // Standard JSON-RPC error codes
   ParseError = -32700,
   InvalidRequest = -32600,
@@ -1237,4 +1237,4 @@ export type ClientResult = z.infer<typeof ClientResultSchema>;
 /* Server messages */
 export type ServerRequest = z.infer<typeof ServerRequestSchema>;
 export type ServerNotification = z.infer<typeof ServerNotificationSchema>;
-export type ServerResult = z.infer<typeof ServerResultSchema>;
+export type ServerResult = z.infer<typeof ServerResultSchema>;
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