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Migrate to MCP SDK v2.0.0b2 (httpx2) (#4503)

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Jeremiah Lowin 2026-07-18 15:12:47 -04:00 • committed by GitHub
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docs/tutorials/rest-api.mdx
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@ -32,7 +32,7 @@ For this tutorial, we'll use the [JSONPlaceholder API](https://jsonplaceholder.t
## Step 2: Create the MCP Server
Now for the magic. We'll use `FastMCP.from_openapi`. This method takes an `httpx.AsyncClient` configured for your API and its OpenAPI specification, and automatically converts **every endpoint** into a callable MCP `Tool`.
Now for the magic. We'll use `FastMCP.from_openapi`. This method takes an `httpx2.AsyncClient` configured for your API and its OpenAPI specification, and automatically converts **every endpoint** into a callable MCP `Tool`.
<Tip>
Learn more about working with OpenAPI specs in the [OpenAPI integration docs](/integrations/openapi).
@ -45,11 +45,11 @@ For this tutorial, we'll use a simplified OpenAPI spec directly in the code. In
Create a file named `api_server.py`:
```python api_server.py {31-35}
import httpx
import httpx2
from fastmcp import FastMCP
# Create an HTTP client for the target API
client = httpx.AsyncClient(base_url="https://jsonplaceholder.typicode.com")
client = httpx2.AsyncClient(base_url="https://jsonplaceholder.typicode.com")
# Define a simplified OpenAPI spec for JSONPlaceholder
openapi_spec = {
@ -150,13 +150,13 @@ Learn more about route maps in the [OpenAPI integration docs](/integrations/open
Here’s how you can add custom route maps to turn `GET` requests into `Resources` and `ResourceTemplates` (if they have path parameters):
```python api_server_with_resources.py {3, 37-42}
import httpx
import httpx2
from fastmcp import FastMCP
from fastmcp.server.providers.openapi import RouteMap, MCPType
# Create an HTTP client for the target API
client = httpx.AsyncClient(base_url="https://jsonplaceholder.typicode.com")
client = httpx2.AsyncClient(base_url="https://jsonplaceholder.typicode.com")
# Define a simplified OpenAPI spec for JSONPlaceholder
openapi_spec = {