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[英]Node.js and Express.js Error : Can't set headers after they are sent
[英]Express.js Rout Redirect Error: Can't set headers after they are sent
我不确定为什么会收到此错误,“错误:发送后无法设置标头。” 它是建立在 express.js 上的简单 API,它将检查用户是否登录,如果用户未登录,它只会将用户带到登录页面。
当您查看以下从fetch(authApiUrl, config)
开始的代码时,如果用户已登录,则状态为 200。如果用户未登录,则状态为 401,然后进入“else”语句并启动redirectToAccountSignin(request, response, wwwS);
.
然后它会进入redirectToAccountSignin
函数。 到目前为止,当我运行此代码时,它确实进入了redirectToAccountSignin
函数,但我相信它会在response.redirect(wwwS + '/account/signin?method=initialize&TARGET=' + encodedTargetUrl);
上引发错误response.redirect(wwwS + '/account/signin?method=initialize&TARGET=' + encodedTargetUrl);
.
我的“重定向”方法有问题吗? 我究竟做错了什么? 任何人都可以帮我解决这个问题吗?
先感谢您。
const fetch = require("node-fetch");
const splunkLogFormat = require('./logUtilities');
function authenticate(request, response, next, successCallback, configuration) {
// get environment for URL call and grab from environment json
const appName = !!configuration.appName ? configuration.appName : 'micro-server-app';
const runtimeEnvironment = !!configuration.environment ? configuration.environment : 'dev';
const logPreamble = splunkLogFormat(appName, 'authenticate');
const wwwS = !!environments && !!environments[runtimeEnvironment] && environments[runtimeEnvironment].www_s;
const authApiUrl = wwwS + '/api/auth/login/check';
const headers = {
'Accept': 'application/json',
'Content-Type': 'application/json',
cookie: request.headers.cookie
};
const method = 'GET';
const config = { headers, method };
fetch(authApiUrl, config)
.then(authResponse => {
const status = authResponse.status;
if (status === 200) {
successCallback(request, response, next);
} else {
redirectToAccountSignin(request, response, wwwS);
}
})
.catch(error => {
redirectToAccountSignin(request, response, wwwS);
});
};
function redirectToAccountSignin(request, response, wwwS) {
const hostname = !!request && request.hostname;
const protocol = 'https://';
const url = !!request && request.originalUrl;
const encodedTargetUrl = encodeURIComponent(protocol + hostname + url);
response.redirect(wwwS + '/account/signin?method=initialize&TARGET=' + encodedTargetUrl);
response.end();
};
module.exports = authenticate;
您确定要在res.end()
之后使用res.redirect()
吗? https://stackoverflow.com/a/54874227/4208845在那之前你在写什么?
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