Spring Boot 在 WebSocket 上使用 Stomp：由于升级标头无效，握手失败：null

Question

我在 Spring Boot 应用程序中使用 ws（非安全 WebSocket）。一旦客户端尝试连接到服务器，就会出现以下错误：

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Handshake failed due to invalid Upgrade header: null

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Spring Boot 应用程序在 Apache 代理后面的 Ubuntu 服务器上运行。Apache配置如下：

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<VirtualHost *:80>\n    DocumentRoot /var/www/myapp/public/\n    ServerAdmin webmaster@localhost\n    ServerName  app.myapp.biz\n\n    RewriteEngine       On\n    RewriteCond         %{HTTP:Upgrade}^websocket$ [NC,OR]\n    RewriteCond         %{HTTP:Connection}^upgrade$ [NC]\n    RewriteRule         .* "ws:/127.0.0.1:8096/$1" [P,QSA,L]\n\n    ProxyPreserveHost   On\n    ProxyRequests       Off\n    ProxyPass           / http://127.0.0.1:8096/\n    ProxyPassReverse    / http://127.0.0.1:8096/\n    RequestHeader       set X-Forwarded-Proto http\n    RequestHeader       set X-Forwarded-Port 80\n\n    SetEnv mongo_username           aUser\n    SetEnv mongo_password           aPassword\n</VirtualHost>\n

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这application.properties的如下：

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debug=false\nserver.port=8096\nserver.address=127.0.0.1\n\nserver.forward-headers-strategy=native\nserver.tomcat.use-relative-redirects=true\nserver.tomcat.remoteip.protocol-header=x-forwarded-proto\nserver.tomcat.remoteip.remote-ip-header=x-forwarded-for\nserver.tomcat.remoteip.port-header=x-forwarded-port\n

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当在我的开发机器上运行应用程序时，一切正常。一旦部署到服务器上就会出现上述错误。我\xe2\x80\x99已经用谷歌搜索了很多，但无法\xe2\x80\x99找到针对这个问题的具体内容。我希望有人能帮帮忙。

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信息：尝试连接的前端应用程序是一个 Angular 应用程序，使用ng2-stompjs.

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Answer 1

我终于找到了错误。语句中的顺序apache.conf确实很重要！工作conf文件如下所示：

<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    ServerName  app.myapp.biz

    ProxyPreserveHost   On
    ProxyRequests       Off
    ProxyPass           / http://127.0.0.1:8096/
    ProxyPassReverse    / http://127.0.0.1:8096/

    RewriteEngine       On
    RewriteCond         %{HTTP:Upgrade} websocket [NC]
    RewriteCond         %{HTTP:Connection} upgrade [NC]
    RewriteRule         ^/?(.*) "ws://127.0.0.1:8096/$1" [P,L]

    SetEnv mongo_username           aUser
    SetEnv mongo_password           aPassword
</VirtualHost>