Default protocol is inconsistent with Node's.

If not specified, http-browserify sets the protocol to `window.location.protocol`. This differs from the behavior of Node (see https://nodejs.org/api/http.html#http_http_request_options_callback ). I assume the reasoning was to make https requests if the current location is also https (but I could be wrong here).

Does it make sense to mimic Node's behavior exactly, and just default to http: ?

The issue I'm running into is when running a script locally in the browser, so the protocol is "file:". http-browserify then tries to make file:// requests, which obviously fail.

首先定位在未提供协议时选择协议的请求选项路径，并将其行为与 Node's http.request 文档进行比较。从本地 file:// 页面复现该问题，并验证未指定协议时默认使用 http: 而不是 file:。

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