Flask-OSError：[Errno 99]无法分配请求的地址

问题描述

我正在尝试为我的Web应用程序创建标准的“忘记密码”功能。问题是，当用户键入他们的电子邮件地址并单击提交以接收令牌，然后他们可以更改密码时，页面将一直加载直到出现以下错误消息为止：

This page isn’t working
{{ URL }} didn’t send any data.
ERR_EMPTY_RESPONSE

我了解Flask-Mail会同步发送电子邮件，因此这可能是连接到Gmail的问题。我尝试在配置邮件对象所用的帐户上打开“缺乏安全的应用程序访问权限”，也尝试更改以下配置选项集：

app.config['MAIL_SERVER'] = 'smtp.googlemail.com'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = os.environ.get('EMAIL_USER')
app.config['MAIL_PASSWORD'] = os.environ.get('EMAIL_PASS')
mail = Mail(app)

对此：

app.config["MAIL_SERVER"] = "smtp.gmail.com"
app.config["MAIL_PORT"] = 465
app.config["MAIL_USE_TLS"] = False
app.config["MAIL_USE_SSL"] = True
app.config["MAIL_USERNAME"] = os.environ.get("EMAIL_USER")
app.config["MAIL_PASSWORD"] = os.environ.get("EMAIL_PASS")
mail = Mail(app)

我在网上看到了建议，但没有一个起作用。

以下是相关的路线和方法：

# Generate password reset token unique to user
def get_reset_token(current_user,expires_sec=1800):
    s = Serializer(app.config["SECRET_KEY"],expires_sec)
    return s.dumps({"user_id": current_user}).decode("utf-8")

# Send reset email
def send_reset_email(user):
    rows = db.execute("SELECT * FROM users WHERE id = :current_user",current_user = user)
    user_email = rows[0]["email"]
    token = get_reset_token(user)
    msg = Message("Password Reset Request",sender = "noreply@demo.com",recipients = [user_email])
    msg.body = f"""To reset your password,visit the following link:
{url_for('new_password',token = token,_external = True)}

If you did not make this request simply ignore this email and no changes will be made.
"""
    mail.send(msg)


@app.route("/reset",methods=["GET","POST"])
def reset():
    if request.method == "GET":
        return render_template("reset.html")
    else:
        email = request.form.get("email")

        # Check email exists in database
        check_email = db.execute("SELECT * FROM users WHERE email = :email",email = email)
        if len(check_email) != 1:
            return apology("You must enter the email address you registered with",403)
        else:
            user = check_email[0]["id"]
            send_reset_email(user)
            flash("An email has been sent with instructions to reset your password")
            return render_template("login.html")

在调试方面，我尝试在不使用mail.send(msg)的情况下运行该应用程序，并且一切正常，减去明显发送的电子邮件，这意味着问题确实与发送的电子邮件有关。另外，我尝试删除token = get_reset_token(user)函数以查看是否是问题所在，但问题仍然存在。

从终端看来，应用程序在提交电子邮件之后没有问题就可以到达check_email = db.execute("SELECT * FROM users WHERE email = :email",email = email)，这时它会一直加载直到超时。

*编辑：这是页面超时时的终端错误消息

ERROR:application:Exception on /reset [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/flask/app.py",line 2447,in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py",line 1952,in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py",line 1821,in handle_user_exception
    reraise(exc_type,exc_value,tb)
  File "/usr/local/lib/python3.7/site-packages/flask/_compat.py",line 39,in reraise
    raise value
  File "/usr/local/lib/python3.7/site-packages/flask/app.py",line 1950,in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py",line 1936,in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/ubuntu/pset8/finance/application.py",line 227,in reset
    send_reset_email(user)
  File "/home/ubuntu/pset8/finance/application.py",line 211,in send_reset_email
    mail.send(msg)
  File "/home/ubuntu/.local/lib/python3.7/site-packages/flask_mail.py",line 491,in send
    with self.connect() as connection:
  File "/home/ubuntu/.local/lib/python3.7/site-packages/flask_mail.py",line 144,in __enter__
    self.host = self.configure_host()
  File "/home/ubuntu/.local/lib/python3.7/site-packages/flask_mail.py",line 156,in configure_host
    host = smtplib.SMTP_SSL(self.mail.server,self.mail.port)
  File "/usr/local/lib/python3.7/smtplib.py",line 1031,in __init__
    source_address)
  File "/usr/local/lib/python3.7/smtplib.py",line 251,in __init__
    (code,msg) = self.connect(host,port)
  File "/usr/local/lib/python3.7/smtplib.py",line 336,in connect
    self.sock = self._get_socket(host,port,self.timeout)
  File "/usr/local/lib/python3.7/smtplib.py",line 1037,in _get_socket
    self.source_address)
  File "/usr/local/lib/python3.7/socket.py",line 728,in create_connection
    raise err
  File "/usr/local/lib/python3.7/socket.py",line 716,in create_connection
    sock.connect(sa)
OSError: [Errno 99] Cannot assign requested address
INFO:werkzeug:192.168.239.121 - - [15/Oct/2020 18:28:12] "POST /reset HTTP/1.0" 500 -

这确认最近调用的代码行是mail.send(msg)

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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email email flask html itsdangerous python