关于Python中Flask全局异常处理流程详解

from flask import *
from paddlenlp import Taskflow
from werkzeug.exceptions import HTTPException
app = Flask(__name__)
app.config['JSON_AS_ASCII'] = False
@app.errorhandler(Exception)
def handle_500_exception(e):
    # pass through HTTP errors
    if isinstance(e, HTTPException):
        return e
    # now you're handling non-HTTP exceptions only
    return render_template("500_generic.html", e=e), 500
@app.errorhandler(HTTPException)
def handle_exception(e):
    response = e.get_response()
    response.data = json.dumps({
        "code": e.code,
        "name": e.name,
        "description": e.description,
    })
    response.content_type = "application/json"
    return response
class RequestParamException(HTTPException):
    code = 400
def handle_param_exception(e):
    response = e.get_response()
    response.data = json.dumps({
        "code": e.code,
        "name": "子类：RequestParamException 处理的异常。",
        "description": e.description,
    })
    response.content_type = "application/json"
    return response
@app.route('/add_user', methods=['POST'])
def add_documents():
    data = request.get_json()
    user = data['user']
    if user is None or len(user) <= 0:
        raise RequestParamException(description="user 不能为 None 或 ''。")
    return {"user": user}, 201
if __name__ == '__main__':
    app.register_error_handler(RequestParamException, handle_param_exception)
    app.run(debug=True)

from flask import Flask
app = Flask(__name__)
@app.errorhandler(404)
def handle_not_found_error(error):
    return "Page not found", 404
@app.errorhandler(Exception)
def handle_generic_error(error):
    return "Internal Server Error", 500
if __name__ == '__main__':
    app.run()

from flask import Flask, abort
app = Flask(__name__)
@app.route('/')
def index():
    # 触发异常方式一：抛出异常
    raise ValueError("Something went wrong")
@app.route('/users/<int:user_id>')
def get_user__':
    app.run()

from flask import Flask, jsonify
app = Flask(__name__)
@app.errorhandler(404)
def handle_not_found_error(error):
    return jsonify({"message": "Page not found"}), 404
@app.errorhandler(Exception)
def handle_generic_error(error):
    app.logger.error("An error occurred: %s", error)
    return jsonify({"message": "Internal Server Error"}), 500
if __name__ == '__main__':
    app.run()

from flask import Flask, jsonify
app = Flask(__name__)
@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')
    if not username or not password:
        # 返回400错误状态码和错误信息
        return jsonify({"error": "Invalid username or password"}), 400
    # 进行身份验证逻辑...
if __name__ == '__main__':
    app.run()

from flask import Flask, jsonify
app = Flask(_name_)
@app.errorhandler(400)
def handle_bad_request_error(error):
    return jsonify({"error": "Bad Request"}), 400
@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')
    if not username or not password:
        # 返回400错误状态码，装饰器的处理函数会被触发
        abort(400)
    # 进行身份验证逻辑...
if __name__ == '__main__':
    app.run()

import logging
from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
    try:
        # 一些潜在的引发异常的操作
        raise ValueError("Something went wrong")
    except Exception as e           app.logger.error("An error occurred: %s", str(e))
        # 返回通用的服务器错误响应
        return "Internal Server Error", 500
if __name__ == '__main       
	app.run()

from flask import Flask, jsonify
app = Flask(__name__)
@app.errorhandler(Exception)
def handle_generic_error(error):
    app.logger.error("An error occurred: %s", error)
    # 返回自定义的服务器错误响应
    return jsonify({"error": "Internal Server Error"}), 500
@app.route('/')
def index():
    try:
        # 一些潜在的引发异常的操作
        raise ValueError("Something went wrong")
    except Exception as:
        # 触发异常后由异常处理函数进行处理
        return handle_generic_error(e)
if __name__ == '__main__':
    app.run()