這裡我們宣告 `openapi_url` 設定，預設值同樣是 `"/openapi.json"`。

接著在建立 `FastAPI` 應用時使用它。

然後你可以將環境變數 `OPENAPI_URL` 設為空字串，以停用 OpenAPI（包含文件 UI），如下：

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

之後若你造訪 `/openapi.json`、`/docs` 或 `/redoc`，會看到如下的 `404 Not Found` 錯誤：

```JSON
{

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package asm

import (
	"cmd/asm/internal/lex"
	"strings"
	"testing"
	"text/scanner"
)

type exprTest struct {
	input  string
	output int64
	atEOF  bool
}

var exprTests = []exprTest{
	// Simple
	{"0", 0, true},
	{"3", 3, true},
	{"070", 8 * 7, true},

   * For example, {@code Splitter.on(Pattern.compile("\r?\n")).split(entireFile)} splits a string
   * into lines whether it uses DOS-style or UNIX-style line terminators.
   *
   * @param separatorPattern the pattern that determines whether a subsequence is a separator. This
   *     pattern may not match the empty string.

                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message
                                                key="labels.webauth_hostname"/></th>
                                        <td>${f:h(hostname)}<la:hidden property="hostname"/></td>

                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message key="labels.role_name"/></th>
                                        <td>${f:h(name)}<la:hidden property="name"/></td>
                                    </tr>
                                    </tbody>

## Technical Details

- **Java Version**: 17+
- **Dependencies**: Apache Commons IO (runtime), JUnit 4 (test)
- **Module Name**: `org.codelibs.curl4j`
- **Package**: `org.codelibs.curl.*`

## Code Style

- Uses external Eclipse formatter from CodeLibs
- Apache License 2.0 headers on all source files
- Comprehensive Javadoc on public APIs

## Test Conventions

- Test class names end with `Test`

                                            <tr>
                                                <th><la:message key="labels.name"/></th>
                                                <th class="text-center" style="width: 20%"><la:message
                                                        key="labels.available"/></th>
                                            </tr>
                                            </thead>

   * For example, {@code Splitter.on(Pattern.compile("\r?\n")).split(entireFile)} splits a string
   * into lines whether it uses DOS-style or UNIX-style line terminators.
   *
   * @param separatorPattern the pattern that determines whether a subsequence is a separator. This
   *     pattern may not match the empty string.

如果將其設為 `--forwarded-allow-ips="*"`，就會信任所有進來的 IP。

如果你的「伺服器」位於受信任的「代理」之後，且只有代理會與它通訊，這樣會讓它接受該「代理」的任何 IP。

<div class="termy">

```console
$ fastapi run --forwarded-allow-ips="*"

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

### 使用 HTTPS 的重新導向 { #redirects-with-https }

例如，假設你定義了一個「路徑操作（path operation）」`/items/`：

                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message
                                                key="labels.boost_document_rule_url_expr"/></th>
                                        <td>${f:h(urlExpr)}<la:hidden property="urlExpr"/></td>