我為一個鷹項目制作了一個網站，其中一部分人們可以提交電子郵件，以便我稍后可以聯系他們。html 看起來像這樣：{%extends "layout.html"%}{%block content%}<div class= "contact">    <h1>How can you help?</h1>    <br>    <p>        The biggest way to help is to <strong>DONATE</strong> to the Eagle project.        Another way that you can help is to volunteer on a work day. This counts        for volunteer hours.    </p>    <br>    <h2>Donations</h2>    <p>you can donate in the following ways</p>    <ul>        <li><a href="">CashApp</a></li>        <li><a href="">Venmo</a></li>        <li>Or a check made out to <strong>lorem</strong></li>    </ul>    <h2>Volunteer</h2>    <p>If you would like to volunteer enter your email below and I will contact you</p>    <form action="contact" method="post">        <input type="text" name="email" placeholder = "enter email here">        <input type="submit" value="Submit">    </form>    <h2>Contact Me</h2>    <ul>        <li>My email:lorem</li>        <li>My number: lorem</li>    </ul></div>{%endblock%}python 后端如下所示：from flask import Flask, render_template,redirect,requestapp = Flask(__name__)@app.route("/contact/", methods = ["POST"])def signup():    file=open("email_list", "a")    email = request.form["email"]    file.write(email+"\n")    file.close()    return redirect("/")@app.route("/")def home():    return render_template("home.html")@app.route("/about/")def about():    return render_template("about.html")@app.route("/contact/")def contact():    return render_template("contact.html")if __name__ == "__main__":    app.run(debug=True)每當我輸入電子郵件時，我都會收到： 在服務器上找不到請求的 URL。如果您手動輸入網址，請檢查拼寫并重試 有人可以幫忙嗎