Add CIMD (Client ID Metadata Document) support for OAuth (#2871)

examples/auth/github_oauth/client.py

@@ -8,14 +8,20 @@ To run:
 
 import asyncio
 
-from fastmcp.client import Client
+from fastmcp.client import Client, OAuth
 
-SERVER_URL = "http://127.0.0.1:8000/mcp"
+SERVER_URL = "http://localhost:8000/mcp"
 
 
 async def main():
     try:
-        async with Client(SERVER_URL, auth="oauth") as client:
+        async with Client(
+            SERVER_URL,
+            auth=OAuth(
+                # Replace with your own CIMD document URL
+                client_metadata_url="https://www.jlowin.dev/mcp-client.json",
+            ),
+        ) as client:
             assert await client.ping()
             print("✅ Successfully authenticated!")