【问题标题】:Jupyterhub Configurable Http Proxy issueJupyterhub 可配置的 Http 代理问题
【发布时间】:2015-12-10 14:57:10
【问题描述】:

我一直在使用 Jupyterhub 的可配置 Http 代理,并且一直在为代理添加必要的选项来处理客户端的 ssl 证书,而无需使用命令行选项。

我的主要目标是接收客户对代理的请求,并将他们的证书信息添加到标头中。一旦进入标题,我将使用 jupyterhub 的身份验证器来制作用户名。

我的问题是,当我使用 http-proxy 可用的 proxy.on('proxyReq 方法设置标头时,我收到此错误:[Error: Can't set headers after they are sent.]

我一直在查看所有代码,以查看正在写入或发送响应/请求的位置,但我找不到它。

这里是ConfigurableProxy功能代码,如果需要我可以给你更多:

function ConfigurableProxy (options) {

var that = this;
this.options = options || {};
this.trie = new trie.URLTrie();
this.auth_token = this.options.auth_token;
this.includePrefix = options.includePrefix === undefined ? true : options.includePrefix;
this.routes = {};
this.host_routing = this.options.host_routing;
this.error_target = options.error_target;
if (this.error_target && this.error_target.slice(-1) !== '/') {
    this.error_target = this.error_target + '/'; // ensure trailing /
}
this.error_path = options.error_path || path.join(__dirname, 'error');

if (this.options.default_target) {
    this.add_route('/', {
        target: this.options.default_target
    });
}

options.ws = true;
options.secure= true;
// These are the ssl options

options.ssl = {
    //Right the key and cert are relative path on my computer
    //but these can be changed.
    key: fs.readFileSync('/Users/grantherman/Desktop/jupyterHubCSProject/ssl/server.key'),
    cert: fs.readFileSync('/Users/grantherman/Desktop/jupyterHubCSProject/ssl/server.crt'),
    requestCert: true,
    //Right now this is set to false, but if we add a CA to these options
    // and set this to true, the proxy will reject all unkown ssl certs
    rejectUnauthorized: false
};
var response = [];
var data = [];
var proxy = this.proxy = httpProxy.createProxyServer(options);

proxy.on('proxyReq', function(proxyReq, req, res, options) {
    console.log("proxy request");
    try{
  proxyReq.setHeader('X-Special-Proxy-Header', req.socket.getPeerCertificate());

  }catch(err){
    console.log(err);
    }

});

 proxy.on('data', function(data, req, res, options) {
  data.push(data);
  });

proxy.on('proxyRes', function(proxyRes, req, res, options) {
  response.push(proxyRes);
  });

proxy.on('error', function(error, req, res, options) {
    log.add(error);

});

proxy.on('close', function (req, socket, head) {
  // view disconnected websocket connections
  console.log('Client disconnected');
});


// tornado-style regex routing,
// because cross-language cargo-culting is always a good idea

this.api_handlers = [
    [ /^\/api\/routes(\/.*)?$/, {
        get : bound(this, authorized(this.get_routes)),
        post : json_handler(bound(this, authorized(this.post_routes))),
        'delete' : bound(this, authorized(this.delete_routes))
    } ]
];

【问题讨论】:

    标签: node.js proxy node-http-proxy jupyter-notebook


    【解决方案1】:

    我认为这需要对可配置的http-proxy 本身进行修改。添加标头的位置是在发起代理请求之前的原始req 对象here

    它看起来像:

    ConfigurableProxy.prototype.handle_proxy = function (kind, req, res) {
        ...
        req.headers['X-My-Header'] = 'My-Value';
        // dispatch the actual method
        this.proxy[kind].apply(this.proxy, args);
    

    向 CHP 添加一个钩子以在此处修改请求,在此过程中,应该可以在不修改 CHP 源的情况下执行此操作。

    【讨论】:

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