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javascript - 使用 respon.json() 时无法设置标头后发送到客户端

问题描述

我想创建一个获取数据的 API。但是，函数 res.json() 根据下面的消息发现了问题

web_1         | Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
web_1         |     at ServerResponse.setHeader (_http_outgoing.js:533:11)
web_1         |     at ServerResponse.header (/mbs_welfare/node_modules/express/lib/response.js:771:10)
web_1         |     at ServerResponse.send (/mbs_welfare/node_modules/express/lib/response.js:170:12)
web_1         |     at /mbs_welfare/server.js:45:9
web_1         |     at Layer.handle_error (/mbs_welfare/node_modules/express/lib/router/layer.js:71:5)
web_1         |     at trim_prefix (/mbs_welfare/node_modules/express/lib/router/index.js:315:13)
web_1         |     at /mbs_welfare/node_modules/express/lib/router/index.js:284:7
web_1         |     at Function.process_params (/mbs_welfare/node_modules/express/lib/router/index.js:335:12)
web_1         |     at next (/mbs_welfare/node_modules/express/lib/router/index.js:275:10)
web_1         |     at Layer.handle_error (/mbs_welfare/node_modules/express/lib/router/layer.js:67:12)

l

router.get('/profile/user/me', async (req, res, next) => {
    let user = req.session.user;
    if(user) {
        try {
            let me = user.adminID
            let info = await knex('admin_accounts').where('adminID', me)
            res.json(info)
        } catch (e) {
            console.log(e);
        }
        res.sendFile(path.join(__dirname + '/../public/personal_information.html'));
    }else{
         res.redirect('/');
    }
});

标签： javascriptjsonexpress

解决方案

出现此错误是因为res在您的代码中多次调用，即：

res.json(info)- 时而时

res.sendFile- 也在这里，例如

您需要确保res一次只调用一次。

换句话说，response每个request.

希望能帮助到你。

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