AI Dev Tool: OpenAI Migrating to HTTPX2

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Preview Code

```python
# AI Dev Tool: FastAPI PostgreSQL Vector Search Extension Boilerplate
# =====================================================================

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from pydantic import BaseModel
from typing import List, Optional
import httpx
import psycopg2
from psycopg2 import Error
import logging

# Initialize the FastAPI application
app = FastAPI()

# Define the PostgreSQL connection settings
POSTGRES_HOST = "localhost"
POSTGRES_DB = "vector_search"
POSTGRES_USER = "postgres"
POSTGRES_PASSWORD = "postgres"

# Define the PostgreSQL vector search extension model
class VectorSearchModel(BaseModel):
# ... full runnable version includes tests & documentation