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

docs_src/advanced_middleware/tutorial003_py39.py

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+from fastapi import FastAPI
+from fastapi.middleware.gzip import GZipMiddleware
+
+app = FastAPI()
+
+app.add_middleware(GZipMiddleware, minimum_size=1000, compresslevel=5)
+
+
+@app.get("/")
+async def main():
+    return "somebigcontent"