FLASK - 在服务器上找不到请求的 URL。如果您手动输入网址，请检查您的拼写并重试答案

【问题标题】：FLASK - The requested URL was not found on the server. If you entered the URL manually please check your spelling and try againFLASK - 在服务器上找不到请求的 URL。如果您手动输入网址，请检查您的拼写并重试
【发布时间】：2020-12-03 23:33:14
【问题描述】：

我正在使用 Flask 运行这个网站。当我运行脚本时，会出现初始站点 (index.html)，一切似乎都很好。但是，当我点击页面底部的提交时，我遇到了这个错误“在服务器上找不到请求的 URL。如果您手动输入了 URL，请检查您的拼写并重试。”

你能帮我找出问题吗？主应用的代码如下。

 from flask import Flask, render_template, request
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)

ENV = 'dev'
   
if ENV =='dev':
    app.debug = True
    app.config['SQLALCHEMY_DATABASEU_URI']   = 'postgresql://postgres:postgres@localhost/Jeopardy'
else:
    app.debug = False
    app.config['SQLALCHEMY_DATABASEU_URI']   = ''

#sapp.config.from_object(os.environ['APP_SETTINGS'])
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False


db=SQLAlchemy(app)

class Jeo(db.Model):
    __tablename__ = 'allc'

    number = db.Column(db.Integer, primary_key=True)
    category = db.Column(db.String())
    question = db.Column(db.String())
    answer = db.Column(db.String())

    def __init(self,category,question,answer,number):
        self.category = category
        self.question = question
        self.answer = answer
        self.number = number

@app.route('/')
def index():
    return render_template("index.html")
@app.route("/add")
def add():
    category=request.args.get('category')
    question=request.args.get('question')
    answer=request.args.get('answer')
    number=request.args.get('number')
    try:
        allc=Jeo(
            category = category,
            question = question,
            answer = answer,
            number = number
        )
        db.session.add(allc)
        db.session.commit()
        return " added. "
    except Exception as e:
        return(str(e))


@app.route("/add/form",methods=['GET', 'POST'])
def add_form():
    if request.method == 'POST':
        category=request.get('category')
        question=request.get('question')
        answer=request.get('answer')
        number=request.get('number')
    
    try:
            allc=Jeo(
            category = category,
            question = question,
            answer = answer,
            number = number
            )
            db.session.add(allc)
            db.session.commit()
            return ("added. ")
    except Exception as e:
            return(str(e))
    return render_template('index.html')
if __name__ == '__main__':
    app.run()

而代码index.html代码为：

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device=width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="../static/style.css">
    <title>Jeopardy</title>
</head>
<body>
    <div class="="container">
        <img src="../static/logo.png" alt="Jeopardy" class ="logo">
        <!-- @todo - message-->
        <form action = "/submit" methods="POST">
            <div class =  " form-group">
            <h3>Jeopardy Question</h3>
                <input
                    type = "text"
                    name = "Question"
                    placeholder= "Type the Jeopardy question here" 
                    />
            </div>
            <div class =  " form-group">
                <h3>Jeopardy Answer</h3>
                    <input
                        type = "text"
                        name = "Answer"
                        placeholder= "Type the Jeopardy Answer here" 
                        />

                </div>
            
        </form>
    </div>
</body>
</html>

【问题讨论】：

标签： python postgresql flask sqlalchemy flask-sqlalchemy

【解决方案1】：

问题出在这里...你要写form action="add"的地方你写成action="submit"

<form action = "/add" methods="POST">
            <div class =  " form-group">
            <h3>Jeopardy Question</h3>
                <input
                    type = "text"
                    name = "Question"
                    placeholder= "Type the Jeopardy question here" 
                    />
            </div>
            <div class =  " form-group">
                <h3>Jeopardy Answer</h3>
                    <input
                        type = "text"
                        name = "Answer"
                        placeholder= "Type the Jeopardy Answer here" 
                        />

                </div>
  
        </form>

【讨论】：