Multiple leading slashes in path causes hostname to be parsed incorrectly

[BanovMiroslav]

Steps to reproduce

Urls such as http://localhost:3000//path cause incorrect parsing of the url.

Here is a catch-all route to show the result:

  server.route({
    method: 'GET',
    path: '/{p*}',
    handler: (request, h) => {
      return {
        p_param: request.params.p,
        request_url: request.url,
        request_path: request.path,
        info_hostname: request.info.hostname,
        info_host: request.info.host,
      };
    },
  });

What was the result you received?

{"p_param":"","request_url":"http://path/","request_path":"/","info_hostname":"path","info_host":"path"}

What did you expect?

{"p_param":"/path","request_url":"http://localhost:3000//path","request_path":"//path","info_hostname":"localhost","info_host":"localhost:3000"}

Context

• node version: v10.16.2
• hapi version: 18.3.1
• os: Ubuntu 18.04.3 LTS

Reason

In _setUrl this code relies on native nodejs Url.URL class.

const base = (url[0] === '/' ? `${this._core.info.protocol}://${this.info.host || `${this._core.info.host}:${this._core.info.port}`}` : undefined);

url = new Url.URL(url, base);

Problem is url "//path" is protocol-relative url that has only domain component. So it is considered absolute for the purpose of the call and base is ignored.