{* ../../docs_src/advanced_middleware/tutorial001.py hl[2,6] *}

## `TrustedHostMiddleware`

Enforces that all incoming requests have a correctly set `Host` header, in order to guard against HTTP Host Header attacks.

{* ../../docs_src/advanced_middleware/tutorial002.py hl[2,6:8] *}

The following arguments are supported:

) : DerAdapter<T> {
  init {
    require(tagClass >= 0)
    require(tag >= 0)
  }

  override fun matches(header: DerHeader): Boolean = header.tagClass == tagClass && header.tag == tag

  override fun fromDer(reader: DerReader): T {
    val peekedHeader = reader.peekHeader()
    if (peekedHeader == null || peekedHeader.tagClass != tagClass || peekedHeader.tag != tag) {
      if (isOptional) return defaultValue as T

<div class="wrapper">
    <jsp:include page="/WEB-INF/view/common/admin/header.jsp"></jsp:include>
    <jsp:include page="/WEB-INF/view/common/admin/sidebar.jsp">
        <jsp:param name="menuCategoryType" value="system"/>
        <jsp:param name="menuType" value="dict"/>
    </jsp:include>
    <div class="content-wrapper">
        <div class="content-header">
            <div class="container-fluid">
                <div class="row mb-2">

}
.navBarCell1Rev {
    background-image:url(resources/tab.gif);
    background-color:#a88834;
    color:#FFFFFF;
    margin: auto 5px;
    border:1px solid #c9aa44;
}
/*
Page header and footer styles
*/
.header, .footer {
    clear:both;
    margin:0 20px;
    padding:5px 0 0 0;
}
.indexHeader {
    margin:10px;
    position:relative;
}
.indexHeader h1 {
    font-size:1.3em;
}

In diesen Fällen können Sie einen `Response`-Parameter verwenden.

## Einen `Response`-Parameter verwenden

Sie können einen Parameter vom Typ `Response` in Ihrer *Pfadoperation-Funktion* deklarieren (wie Sie es auch für Cookies und Header tun können).

Anschließend können Sie den `status_code` in diesem *vorübergehenden* Response-Objekt festlegen.

```Python hl_lines="1  9  12"
{!../../docs_src/response_change_status_code/tutorial001.py!}
```

		return config.DefaultHelpPostfix(DefaultKVS, key)
	}

	Help = config.HelpKVS{
		config.HelpKV{
			Key:         browserCSPPolicy,
			Description: `set Content-Security-Policy response header value` + defaultHelpPostfix(browserCSPPolicy),
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         browserHSTSSeconds,

// AWS Signature V4 chunked reader.
type s3UnsignedChunkedReader struct {
	reader   *bufio.Reader
	trailers http.Header

	buffer []byte
	offset int
	err    error
	debug  bool
}

func (cr *s3UnsignedChunkedReader) Close() (err error) {
	return cr.err
}

// Read - implements `io.Reader`, which transparently decodes
// the incoming AWS Signature V4 streaming signature.

	o = msgp.Require(b, z.Msgsize())
	// map header, size 5
	// string "APIVersion"
	o = append(o, 0x85, 0xaa, 0x41, 0x50, 0x49, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e)
	o = msgp.AppendString(o, z.APIVersion)
	// string "Flags"
	o = append(o, 0xa5, 0x46, 0x6c, 0x61, 0x67, 0x73)
	// map header, size 3
	// string "Filter"
	o = append(o, 0x83, 0xa6, 0x46, 0x69, 0x6c, 0x74, 0x65, 0x72)

                return true;
            }
            if (elementName.equals("th")) {
                if (header == null) {
                    header = document.createElement("thead");
                    currentTable.insertBefore(header, null);
                    header.appendChild(currentRow);
                }
                nodes.push(document.createElement("td"));
                return true;

import static com.google.common.collect.testing.Helpers.NullsBeforeB;
import static com.google.common.collect.testing.Helpers.assertContains;
import static com.google.common.collect.testing.Helpers.assertContainsAllOf;
import static com.google.common.collect.testing.Helpers.assertContentsInOrder;
import static com.google.common.collect.testing.Helpers.assertEmpty;
import static com.google.common.collect.testing.Helpers.assertEqualInOrder;