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Document as_proxy backend keyword migration

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Jeremiah Lowin 2026-07-06 22:05:16 -04:00
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docs/getting-started/upgrading/from-fastmcp-2.mdx
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@ -393,13 +393,17 @@ mcp.add_transform(ToolTransform({"name": config}))
**FastMCP.as_proxy() → create_proxy()** (Removed in v4)
The proxy target is passed positionally in both APIs, so most calls migrate unchanged. If you passed the target by keyword, note that the parameter was renamed from `backend=` to `target=`.
```python
# Removed in v4
proxy = FastMCP.as_proxy("http://example.com/mcp")
proxy = FastMCP.as_proxy(backend="http://example.com/mcp") # keyword form
# New
from fastmcp.server import create_proxy
proxy = create_proxy("http://example.com/mcp")
proxy = create_proxy(target="http://example.com/mcp") # as_proxy(backend=X) → create_proxy(target=X)
```
## v2.14.0