# file app.py

import os
from flask import Flask, render_template
from .search_blueprint import search_blueprint

app = Flask(__name__)
app.register_blueprint(search_blueprint, url_prefix='/search')

@app.route('/')
def index():
    return render_template('index.html')

if __name__ == '__main__':
    app.run(use_reloader=True, port=5000, threaded=True)

# file search_blueprint.py

from flask import Blueprint, send_from_directory
import os

build_dir = os.path.abspath('./app/static/build')
search_blueprint = Blueprint('search', __name__, static_folder=build_dir)

# Serve React App
@search_blueprint.route('/', defaults={'path': ''})
@search_blueprint.route('/<path:path>')
def serve(path):
    if(path == ""):
        return send_from_directory(build_dir, 'index.html')
    else:
        if(os.path.exists(os.path.join(build_dir, path))):
            return send_from_directory(build_dir, path)
        else:
            return send_from_directory(build_dir, 'index.html')

app
├───static
│    └───build
├───templates
│    └───index.html
├───app.py
└───search_blueprint.py