⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (dff5)

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```python
# AI Dev Tool: Cloudflare Worker Hono API Template with FastAPI and Pydantic v2
# Description: A production-ready starter boilerplate for building micro-SaaS applications
#               with Cloudflare Workers, Hono, FastAPI, and Pydantic v2.

import os
import json
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional
from hono import Hono
from cloudflare import Cloudflare

# Define the FastAPI application
app = FastAPI()

# Define the Pydantic model for the API request
class RequestModel(BaseModel):
    """Request model for the API"""
    name: str
    email: str
    message: Optional[str] = None

# Initialize the Hono client
hono = Hono(os.environ.get("HONO_API_KEY"))

# Initialize the Cloudflare client
cloudflare = Cloudflare(os.environ.get("CLOUDFLARE_API_KEY"))

# Define the API endpoint
@app.post("/api/submit")
async def submit(request: RequestModel):
    """
    API endpoint to submit a request.

Args:
        request (RequestModel): The request model.

Returns:
        dict: The response

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