if (properties != null && properties.length > 0) {
                        headers = new HashMap<>();
                        for (PlexusConfiguration property : properties) {
                            headers.put(
                                    property.getChild("name").getValue(),
                                    property.getChild("value").getValue());

 *   <li>ROBOTS_TXT_ENABLED_PROPERTY: Enable or disable robots.txt parsing.</li>
 *   <li>AUTHENTICATIONS_PROPERTY: Web authentications.</li>
 *   <li>REQUEST_HEADERS_PROPERTY: Custom request headers.</li>
 *   <li>REDIRECTS_ENABLED: Enable or disable HTTP redirects.</li>
 *   <li>COOKIES_PROPERTY: Cookie settings.</li>
 *   <li>AUTH_SCHEME_PROVIDERS_PROPERTY: Authentication scheme providers.</li>

///

## Add custom headers { #add-custom-headers }

There are some situations in where it's useful to be able to add custom headers to the HTTP error. For example, for some types of security.

You probably won't need to use it directly in your code.

But in case you needed it for an advanced scenario, you can add custom headers:

{* ../../docs_src/handling_errors/tutorial002_py310.py hl[14] *}

更新证书的过程中同时保持提供服务。

## 代理转发请求头 { #proxy-forwarded-headers }

当使用代理来处理 HTTPS 时，你的**应用服务器**（例如通过 FastAPI CLI 运行的 Uvicorn）对 HTTPS 过程并不了解，它只通过纯 HTTP 与 **TLS 终止代理**通信。

这个**代理**通常会在将请求转发给**应用服务器**之前，临时设置一些 HTTP 请求头，以便让应用服务器知道该请求是由代理**转发**过来的。

/// note | 技术细节

这些代理请求头包括：

* [X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-For)

  // Optional: confirm that your app made the HTTP requests you were expecting.
  val request1 = server.takeRequest()
  assertEquals("/v1/chat/messages/", request1.url.encodedPath)
  assertNotNull(request1.headers["Authorization"])

  val request2 = server.takeRequest()
  assertEquals("/v1/chat/messages/2", request2.url.encodedPath)

  val request3 = server.takeRequest()

     */
    const val DEFAULT_INITIAL_WINDOW_SIZE = 65535

    /** HTTP/2: Size in bytes of the table used to decode the sender's header blocks. */
    const val HEADER_TABLE_SIZE = 1

    /** HTTP/2: The peer must not send a PUSH_PROMISE frame when this is 0. */
    const val ENABLE_PUSH = 2

    /** Sender's maximum number of concurrent streams. */
    const val MAX_CONCURRENT_STREAMS = 3

    /** Window size in bytes. */

    else:
        authenticate_value = "Bearer"
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": authenticate_value},
    )
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username = payload.get("sub")
        if username is None:

    }
  }

  private fun headersToList(response: MockResponse): List<String> {
    val headers = response.headers
    val size = headers.size
    val headerList: MutableList<String> = ArrayList(size)
    for (i in 0 until size) {
      headerList.add(headers.name(i) + ": " + headers.value(i))
    }
    return headerList
  }

  @Test
  fun shutdownWithoutStart() {

		// not a storage error.
		return nil
	}
	readers := make([]*metacacheReader, len(disks))
	defer func() {
		for _, r := range readers {
			r.Close()
		}
	}()
	for i := range disks {
		r, w := io.Pipe()
		// Make sure we close the pipe so blocked writes doesn't stay around.
		defer r.CloseWithError(context.Canceled)

		readers[i] = newMetacacheReader(r)
		d := disks[i]

			n++
		}
	}
	etag := append(h.Sum(nil), '-')
	return strconv.AppendInt(etag, n, 10)
}

// Set adds the ETag to the HTTP headers. It overwrites any
// existing ETag entry.
//
// Due to legacy S3 clients, that make incorrect assumptions
// about HTTP headers, Set should be used instead of
// http.Header.Set(...). Otherwise, some S3 clients will not
// able to extract the ETag.