Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/wsgi/tutorial001_py39.py

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+from fastapi import FastAPI
+from fastapi.middleware.wsgi import WSGIMiddleware
+from flask import Flask, request
+from markupsafe import escape
+
+flask_app = Flask(__name__)
+
+
+@flask_app.route("/")
+def flask_main():
+    name = request.args.get("name", "World")
+    return f"Hello, {escape(name)} from Flask!"
+
+
+app = FastAPI()
+
+
+@app.get("/v2")
+def read_main():
+    return {"message": "Hello World"}
+
+
+app.mount("/v1", WSGIMiddleware(flask_app))