HTTP 方法

兩種最常見的 HTTP 方法是 GET 和 POST 。Flask 可以根據所使用的 HTTP 方法從相同的 URL 執行不同的程式碼。例如，在具有帳戶的 Web 服務中，最方便的是通過相同的 URL 路由登入頁面和登入過程。GET 請求（與你在瀏覽器中開啟 URL 時相同）應顯示登入表單，而 POST 請求（攜帶登入資料）應單獨處理。還建立了一個路由來處理 DELETE 和 PUT HTTP 方法。

@app.route("/login", methods=["GET"])
def login_form():
    return "This is the login form"
@app.route("/login", methods=["POST"])
def login_auth():
    return "Processing your data"
@app.route("/login", methods=["DELETE", "PUT"])
def deny():
    return "This method is not allowed"

為了簡化程式碼，我們可以從 flask 匯入 request 包。

from flask import request

@app.route("/login", methods=["GET", "POST", "DELETE", "PUT"])
def login():
    if request.method == "DELETE" or request.method == "PUT":
        return "This method is not allowed"
    elif request.method == "GET":
        return "This is the login forum"
    elif request.method == "POST":
        return "Processing your data"

要從 POST 請求中檢索資料，我們必須使用 request 包：

from flask import request
@app.route("/login", methods=["GET", "POST", "DELETE", "PUT"])
def login():
    if request.method == "DELETE" or request.method == "PUT":
        return "This method is not allowed"
    elif request.method == "GET":
        return "This is the login forum"
    elif request.method == "POST":
        return "Username was " + request.form["username"] + " and password was " + request.form["password"]