使flask返回响应头部为http1.1，而不是http1.0

from flask import Flask, make_response

app = Flask(__name__)

@app.route('/')
def index():
    response = make_response('Hello, World!')
    response.headers['Server'] = 'Flask'
    response.headers['Content-Type'] = 'text/plain'
    response.headers['Connection'] = 'keep-alive'
    response.headers['Keep-Alive'] = 'timeout=5, max=100'
    response.headers['Upgrade'] = 'HTTP/1.1'
    return response

if __name__ == '__main__':
    app.run()