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flask中跳转的同时设置cookie

 3 years ago
source link: https://www.yangyanxing.com/article/flask-redirect-cookie.html
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flask中跳转的同时设置cookie

最近在使用flask的时候，有一个比较麻烦的事情，在跳转网页的时候需要设置cookie，使用单独设置cookie与单独跳转都比较简单，

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from flask import  redirect

@app.route("/redirect")
def redirecttest():
    return redirect("/test")

设置cookie

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from flask import Flask,make_response

app = Flask(__name__)

@app.route("/set_cookie")
def set_cookie():
    #先创建响应对象
    resp = make_response("set cookie test")
    # 设置cookie  cookie名 cookie值 默认临时cookie浏览器关闭即失效
    # 通过max_age控制cookie有效期, 单位:秒
    resp.set_cookie("display","yangyanxing",max_age=3600) 
    return resp

可以看到，设置cookie的response 最后是通过return 回来的，但是上面的网页跳转则是通过redirect() 函数返回的，所以这两个没法同时的使用。

查看redirect() 的源码

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def redirect(location, code=302, Response=None):    
    if Response is None:
        from .wrappers import Response

display_location = escape(location)
    if isinstance(location, text_type):
        # Safe conversion is necessary here as we might redirect
        # to a broken URI scheme (for instance itms-services).
        from .urls import iri_to_uri

location = iri_to_uri(location, safe_conversion=True)
    response = Response(
        '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
        "<title>Redirecting...</title>\n"
        "<h1>Redirecting...</h1>\n"
        "<p>You should be redirected automatically to target URL: "
        '<a href="%s">%s</a>.  If not click the link.'
        % (escape(location), display_location),
        code,
        mimetype="text/html",
    )
    response.headers["Location"] = location
    return response

可以看到，其实redirect函数也是通过构造一个response最后再将这个resonse return 出去，所以我们是否可以构造一个类似于redirect函数中的response对象，然后设置好status code是不是就可以了呢？ 

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from flask import Flask,make_response,escape
app = Flask(__name__)

@app.route("/test")
def test():
    response = make_response(
        '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
        "<title>Redirecting...</title>\n"
        "<h1>Redirecting...</h1>\n"
        "<p>You should be redirected automatically to target URL: "
        '<a href="%s">%s</a>.  If not click the link.'
        % (escape("https://www.baidu.com"),
           escape("https://www.baidu.com")), 302)
    response.set_cookie('display',"yangyanxing")
    return respose

运行上面的代码，发现停留在/test 页面，显示上面的make_response的文字，并没有跳转，但是cookie中已经有display的cookie了，说明设置cookie成功了，跳转也成功了一半，只是它没有真正的跳转，还需要在网页上点击一下。

flask.png

redirect函数中是通过 response.headers["Location"] = location 来设置的，在make_response 的返回响应对象中是通过response.location = 'xxxx' 来设置的

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from flask import Flask,make_response,escape
app = Flask(__name__)

@app.route("/test")
def test():
    response = make_response(
        '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
        "<title>Redirecting...</title>\n"
        "<h1>Redirecting...</h1>\n"
        "<p>You should be redirected automatically to target URL: "
        '<a href="%s">%s</a>.  If not click the link.'
        % (escape("https://www.baidu.com"),
           escape("https://www.baidu.com")), 302)
    response.set_cookie('display',"yangyanxing")
    `response.location = escape("https://www.baidu.com")
    return respose

这时就可以正常的跳转了

本文由 杨彦星 发表于 杨彦星的个人博客 ,采用「署名 4.0 国际」创作共享协议。
非商业转载请注明作者及出处。商业转载请联系作者本人。
本文标题为: flask中跳转的同时设置cookie

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