Flask-Reflection

Python Flask Header & Payload Reflection

安裝 Flask

mkdir flask
cd flask
python3 -m venv venv
venv\Scripts\activate
pip install Flask

啟動 flask

flask --app main run
flask --app main --debug run

Flask 結構

/main.py /templates/base.html /templates/index.html /templates/form.html /templates/404.html

後端框架實現功能

Routing

@app.route("/", methods = ['GET', 'POST'])
def htmlRequest():
    if request.method == 'GET':
      ...
    if request.method =='POST':
      ...

Error Handle

@app.errorhandler(404)
def page_not_found(error):
    return make_response(render_template('404.html', error=error), 404)

Json Response

from flask import jsonify

@app.route("/json", methods = ['GET', 'POST'])
def jsonRequest():
    viewModel = {
         "headers": { k:v for k, v in request.headers.items()},
    }
    return jsonify(viewModel)

Url Generate

<a class="btn btn-primary" href="{{ url_for('postFormRequest') }}">Post Form</a>

<form method="post" action="{{ url_for('htmlRequest', foo=10, bar=30) }}">
  ...
</form>

HTTP Data Handle

注意 request 的資料物件不是 Dict 在 jsonift 會發生例外錯誤，必須主動透過 dict generator 轉換為 dict 以正確處理。

viewModel = {
      "headers": { k:v for k, v in request.headers.items()},
      "querystring": { k:v for k, v in request.args.items()},
      "payload": { k:v for k, v in request.form.items()},
      "json": { k:v for k, v in request.json.items()}
}