✨ Add support for declaring UploadFile parameters without explicit File() (#4469)

docs_src/request_files/tutorial001_02.py

@@ -0,0 +1,21 @@
+from typing import Optional
+
+from fastapi import FastAPI, File, UploadFile
+
+app = FastAPI()
+
+
+@app.post("/files/")
+async def create_file(file: Optional[bytes] = File(None)):
+    if not file:
+        return {"message": "No file sent"}
+    else:
+        return {"file_size": len(file)}
+
+
+@app.post("/uploadfile/")
+async def create_upload_file(file: Optional[UploadFile] = None):
+    if not file:
+        return {"message": "No upload file sent"}
+    else:
+        return {"filename": file.filename}