Question

我正在使用带有nodeJs v6后端的react前端和socket.io-redis pub sub方法。在这种情况下，浏览器拒绝连接我有这个错误： Failed to load https://api.mydomain.com/socket.io-client/?EIO=3&transport=polling&t=M8vzD5C: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:3000, *', but only one is allowed. Origin 'http://localhost:3000' is therefore not allowed access. 我正在前端运行反应，后端nodeJs，与pub子socket-redis连接这是我的回复标题： Access-Control-Allow-Credentials: true Access-Control-Allow-Credentials: true Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, If-Modified-Since, Authorization Access-Control-Allow-Methods: POST, GET, PUT, DELETE, OPTIONS Access-Control-Allow-Origin: http://localhost:3000 Access-Control-Allow-Origin: * Connection: keep-alive Content-Length: 104 Content-Type: text/plain; charset=UTF-8 Date: Sun, 18 Mar 2018 16:19:12 GMT Server: nginx/1.10.3 (Ubuntu) 我可能知道我做错了什么显然可以建立联系但它立即中断并继续尝试重新连接循环（我知道为什么）但为什么我的响应标题会有多个值？

Answer 1

这是我在上面的代码中添加的内容：我注释掉了影响套接字请求的add_headers

set $cors '';
if ($request_uri !~ '^/socket.io-client') {
set $cors 'true';
}

if ($cors = 'true') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Credentials' 'true';
}

具有多个值的Socket.io服务器响应

1 个答案: