运行webapp时出现404错误，即使将其更改为最基本的模板，该错误甚至都不允许我的错误html运行。我不知道在哪里找不到我的请求。
我尝试从base.html删除所有样式表以查看是否存在那些样式表，我尝试更改error.html以查看其是否会真正运行，我尝试注释掉html文件中的所有url_for。 / p>
我评论了一下结果，所以我不这么认为。
routes.py
from app import app
from flask import Flask, abort, jsonify, redirect, url_for, request, render_template
from werkzeug.exceptions import HTTPException
from app.results import clean_data, get_response
@app.errorhandler(Exception)
def handle_error(e):
'''
code = 500
if isinstance(e, HTTPException):
code = e.code'''
print(str(e))
return render_template("error.html")
@app.route('/', methods=['GET', 'POST'])
def index():
data = clean_data(request.form)
response = get_response(data)
print(response)
return render_template("index.html")
base.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Default Scorer -- Ebury</title>
<meta name = "viewport" content = "width=device-width", initial-scale = 1, shrink-to-fit=no">
<link rel="icon" href="{{ url_for('static', filename='favicon.ico') }}">
<!-- CSS-->
<link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
<link href="https://fonts.googleapis.com/css?family=Roboto:100" rel="stylesheet">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- JS-->
<!-- [if lt IE 9]><script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js" type="text/javascript"></script><![endif] -->
<script src="https://ebury-chameleon.s3.amazonaws.com/1.17.0/scripts/ebury-chameleon.js" type="text/javascript"></script>
</head>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="/">
<img src="{{ url_for('static', filename='img/Ebury.png') }}" width="80" height="30" alt="">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<div class="navbar-nav">
<a class="nav-item nav-link active" href="/"><b>Default Scorer</b> <span class="sr-only">(current)</span></a>
</div>
<div class="navbar-nav ml-auto">
<a class="nav-item nav-link" href="/logout">Log out</a>
</div>
</div>
</nav>
<body>
</body>
</html>
index.html（只有相关部分有很多形式）
{% extends "base.html" %}
{% block title %}Index{% endblock %}
{% block content %}
<div class="m-1 pb-3"></div>
<div class="container-fluid">
<div class = "row">
<div class="col-md-3 push-md-3">
<div class = "m-0 pb-0">
<form action="" method="post" role="form" class="needs-validation" novalidate>
<div class="container">
<div class = "form-group">
<div class = "row">
<div class="input-group input-group-sm mb-3">
<div class="input-group-prepend">
<span class = "input-group-text">BVD ID Number</span>
</div>
<input type = "text" class = "form-control" id = "bvd_id_number" name = "bvd_id_number">
</div>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
{% endblock %}
{% block scripts %}
<script>
(function() {
'use strict';
window.addEventListener('load', function() {
// Fetch all the forms we want to apply custom Bootstrap validation styles to
var forms = document.getElementsByClassName('needs-validation');
// Loop over them and prevent submission
var validation = Array.prototype.filter.call(forms, function(form) {
form.addEventListener('submit', function(event) {
if (form.checkValidity() === false) {
event.preventDefault();
event.stopPropagation();
}
form.classList.add('was-validated');
}, false);
});
}, false);
})();
</script>
{% endblock %}
error.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ERROR</title>
</head>
<body>
<h1>ERROR</h1>
</body>
</html>
所以发生的是该表单没有出现，并且似乎只显示了base.html，没有其他图标，也没有出现该图标，但是我尝试将其注释掉，这是行不通的。
打印的错误是“找不到404：在服务器上找不到所请求的URL。如果您手动输入URL，请检查拼写，然后重试”
答案 0 :(得分：0)
致未来的人们：我解决了，因为base.html没有指定必须扩展的位置。正确的base.html代码为：
<html>
<head>
<meta charset="utf-8">
<title>Default Scorer -- Ebury</title>
<meta name = "viewport" content = "width=device-width", initial-scale = 1, shrink-to-fit=no">
<link rel="icon" href="{{ url_for('static', filename='favicon.ico') }}">
<!-- CSS-->
<link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
<link href="https://fonts.googleapis.com/css?family=Roboto:100" rel="stylesheet">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- JS-->
<!-- [if lt IE 9]><script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js" type="text/javascript"></script><![endif] -->
<script src="https://ebury-chameleon.s3.amazonaws.com/1.17.0/scripts/ebury-chameleon.js" type="text/javascript"></script>
</head>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="/">
<img src="{{ url_for('static', filename='img/Ebury.png') }}" width="80" height="30" alt="">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<div class="navbar-nav">
<a class="nav-item nav-link active" href="/"><b>Default Scorer</b> <span class="sr-only">(current)</span></a>
</div>
<div class="navbar-nav ml-auto">
<a class="nav-item nav-link" href="/logout">Log out</a>
</div>
</div>
</nav>
<body>
{% block content %}
{% endblock %}
</body>
{% block scripts %}
{% endblock %}
</html>```