Flask Query Arguments Parser, as your view decorators.
$ pip install flask-qargs
from flask import Flask, g
import flask_qargs as qargs
app = Flask(__name__)
@app.route("/")
@qargs.init()
@qargs.argument('greeting', location='args', required=True)
@qargs.argument('name', location='args', required=True)
def hello():
args = g.qargs
return "{0} {1}!".format(args.greeting, args.name)
app.run(port=9998)
$ curl 'http://localhost:9998?greeting=Hi&name=Wonder'
Hi Wonder!