例如，假设你定义了一个*路径操作* `/items/`：

{* ../../docs_src/behind_a_proxy/tutorial001_01_py310.py hl[6] *}

如果客户端尝试访问 `/items`，默认会被重定向到 `/items/`。

但在设置 *CLI 选项* `--forwarded-allow-ips` 之前，它可能会重定向到 `http://localhost:8000/items/`。

而你的应用可能托管在 `https://mysuperapp.com`，重定向应当是 `https://mysuperapp.com/items/`。

通过设置 `--proxy-headers`，FastAPI 现在就可以重定向到正确的位置。😎

```
https://mysuperapp.com/items/
```

/// tip | 提示

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

            EncryptionNegotiateContext context = new EncryptionNegotiateContext(mockConfig, new int[] { 1, 2 });
            byte[] smallBuffer = new byte[100]; // Make buffer large enough
            byte[] largeBuffer = new byte[1000];

            // Act
            int smallEncodedSize = context.encode(smallBuffer, 0);
            int largeEncodedSize = context.encode(largeBuffer, 500);

            // Assert

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

        .isEqualTo("Code must be in range [1000,5000): 1")
    }
    data.write("88021388".decodeHex()) // Close with code 5000
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->
      assertThat(expected.message)
        .isEqualTo("Code must be in range [1000,5000): 5000")
    }
  }

  @Test fun closeReservedSetThrows() {

        headers=headers,
        timeout=settings.httpx_timeout,
        json={"query": query, "variables": variables, "operationName": "Q"},
    )
    if response.status_code != 200:
        logging.error(
            f"Response was not 200, after: {after}, category_id: {category_id}"
        )
        logging.error(response.text)
        raise RuntimeError(response.text)
    data = response.json()
    if "errors" in data:

		{[]string{"localhost:" + casePorts[0]}, "127.0.0.1:" + casePorts[0]},
		{[]string{nonLoopBackIP + ":" + casePorts[1]}, nonLoopBackIP + ":" + casePorts[1]},
		{[]string{"127.0.0.1:" + casePorts[2], nonLoopBackIP + ":" + casePorts[2]}, "0.0.0.0:" + casePorts[2]},
		{[]string{"localhost:" + casePorts[3]}, "127.0.0.1:" + casePorts[3]},
		{[]string{nonLoopBackIP + ":" + casePorts[4]}, nonLoopBackIP + ":" + casePorts[4]},

/* jcifs smb client library in Java
 * Copyright (C) 2002  "Michael B. Allen" <jcifs at samba dot org>
 *                   "Eric Glass" <jcifs at samba dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *

		return healEntryResult{
			bytes:   sz,
			skipped: true,
		}
	}

	// Collect updates to tracker from concurrent healEntry calls
	results := make(chan healEntryResult, 1000)
	quitting := make(chan struct{})
	defer func() {
		close(results)
		<-quitting
	}()

	go func() {
		for res := range results {
			if res.entryDone {
				tracker.setObject(res.name)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.google.guava</groupId>
    <artifactId>guava-parent</artifactId>
    <version>999.0.0-HEAD-jre-SNAPSHOT</version>
  </parent>