Щоб досягти цього, бекенд на порту `:80` повинен мати список "дозволених джерел".

У цьому випадку список має містити `http://localhost:8080`, щоб фронтенд на порту `:8080` працював коректно.

## Символьне підставляння

* `http://localhost`
* `https://localhost`
* `http://localhost:8080`

🚥 👫 🌐 `localhost`, 👫 ⚙️ 🎏 🛠️ ⚖️ ⛴,, 👫 🎏 "🇨🇳".

## 🔁

, ➡️ 💬 👆 ✔️ 🕸 🏃 👆 🖥 `http://localhost:8080`, & 🚮 🕸 🔄 🔗 ⏮️ 👩‍💻 🏃 `http://localhost` (↩️ 👥 🚫 ✔ ⛴, 🖥 🔜 🤔 🔢 ⛴ `80`).

⤴️, 🖥 🔜 📨 🇺🇸🔍 `OPTIONS` 📨 👩‍💻, & 🚥 👩‍💻 📨 ☑ 🎚 ✔ 📻 ⚪️➡️ 👉 🎏 🇨🇳 (`http://localhost:8080`) ⤴️ 🖥 🔜 ➡️ 🕸 🕸 📨 🚮 📨 👩‍💻.

identity_openid config_url=https://accounts.google.com/.well-known/openid-configuration client_id=843351d4-1080-11ea-aa20-271ecba3924a
```

Testing with an example
> Visit [Google Developer Console](https://console.cloud.google.com) under Project, APIs, Credentials to get your OAuth2 client credentials. Add `http://localhost:8080/oauth2/callback` as a valid OAuth2 Redirect URL.

```

Shinsuke Sugaya <******@****.***> 1576358545 +0900

fa-regular-400.svg...

Поэтому это три разных источника:

* `http://localhost`
* `https://localhost`
* `http://localhost:8080`

Даже если они все расположены в `localhost`, они используют разные протоколы и порты, а значит, являются разными источниками.

## Шаги

### Browser UI

- Search UI: http://localhost:8080/

![Search UI](https://fess.codelibs.org/_images/fess_search_result1.png)

- Admin UI: http://localhost:8080/admin/ (default username/password is admin/admin)

![Admin UI](https://fess.codelibs.org/_images/fess_admin_dashboard.png)

}

func main() {
	flag.Parse()
	serveFunc := func() error {
		return http.ListenAndServe(":8080", nil)
	}

	if certFile != "" || keyFile != "" {
		if certFile == "" || keyFile == "" {
			log.Fatal("Please provide both a key file and a cert file to enable TLS.")
		}
		serveFunc = func() error {
			return http.ListenAndServeTLS(":8080", certFile, keyFile, nil)
		}
	}

	http.HandleFunc("/", mainHandler)

  <Description>Full Text Search for Your Documents.</Description>
  <Tags>Full Text Search</Tags>
  <Contact>******@****.***</Contact>
  <SearchForm>http://localhost:8080/fess/</SearchForm>
  <Url type="text/html" template="http://localhost:8080/fess/search?q={searchTerms}"/>
  <InputEncoding>UTF-8</InputEncoding>
  <OutputEncoding>UTF-8</OutputEncoding>

    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: 14.8.0
externalDocs:
  description: API Documentation
  url: https://fess.codelibs.org/14.8/api/
servers:
  - url: http://localhost:8080/api/v1
tags:
  - name: search
    description: Search operations
  - name: popularword
    description: Popular word operations
  - name: monitor
    description: Monitoring operations
  - name: suggest