Deno 反向代理解决前端跨域问题以及将 http 转为 https

前端在调用别人 api 时经常遇到跨域或者 https 无法调用 http 的问题，通过反代即可解决。 deno.com 提供免费的 NodeJS 环境，在其官网后台新建应用，在 playground 粘贴代码：

import { serve } from "https://deno.land/[email protected]/http/server.ts" serve(async (req: Request) => { const url = new URL(req.url) const targetUrl = url.href.replace(`${url.origin}/`, '') let urlObj: any try { urlObj = new URL(targetUrl) } catch (e) { console.error(e.message) } if (['http:', 'https:'].indexOf(urlObj?.protocol) > -1) { let res = await fetch(targetUrl, { headers: req.headers, method: req.method, body: req.body, }) let headers = {} res.headers.forEach((value, key) => { headers[key] = value }) if ('*' !== headers['Access-Control-Allow-Origin']?.trim() && '*' !== headers['access-control-allow-origin']?.trim()) { headers['Access-Control-Allow-Origin'] = '*' } return new Response(res.body, { headers, status: res.status }) } return new Response( `Usage: ${url.origin}/https://deno.com/deploy/docs/pricing-and-limits`) })