val headers1 =
      Headers.Builder()
        .add("Connection", "close")
        .add("Transfer-Encoding", "chunked")
        .build()
    val headers2 =
      Headers.Builder()
        .add("Connection", "keep-alive")
        .add("Transfer-Encoding", "chunked")
        .build()
    assertThat(headers2).isNotEqualTo(headers1)
    assertThat(headers2.hashCode()).isNotEqualTo(headers1.hashCode().toLong())
  }

      '@type': type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
      config:
        configuration:
          '@type': type.googleapis.com/google.protobuf.StringValue
          value: '{"header_1":"some_value_1","header_2":"another_value"}'
        name: default.display-metadata
        vmConfig:
          code:
            local:

// [CanonicalHeaderKey].
func (h Header) Del(key string) {
	textproto.MIMEHeader(h).Del(key)
}

// Write writes a header in wire format.
func (h Header) Write(w io.Writer) error {
	return h.write(w, nil)
}

func (h Header) write(w io.Writer, trace *httptrace.ClientTrace) error {
	return h.writeSubset(w, nil, trace)
}

// Clone returns a copy of h or nil if h is nil.
func (h Header) Clone() Header {
	if h == nil {

## Duplicate headers

It is possible to receive duplicate headers. That means, the same header with multiple values.

You can define those cases using a list in the type declaration.

You will receive all the values from the duplicate header as a Python `list`.

For example, to declare a header of `X-Token` that can appear more than once, you can write:

func setEventStreamHeaders(w http.ResponseWriter) {
	w.Header().Set(xhttp.ContentType, "text/event-stream")
	w.Header().Set(xhttp.CacheControl, "no-cache") // nginx to turn off buffering
	w.Header().Set("X-Accel-Buffering", "no")      // nginx to turn off buffering
}

// Write http common headers
func setCommonHeaders(w http.ResponseWriter) {
	// Set the "Server" http header.
	w.Header().Set(xhttp.ServerInfo, MinioStoreName)

    ```

!!! note "Detalhes Técnicos"
    `Header` é uma classe "irmã" de `Path`, `Query` e `Cookie`. Ela também herda da mesma classe em comum `Param`.

    Mas lembre-se que quando você importa `Query`, `Path`, `Header`, e outras de `fastapi`, elas são na verdade funções que retornam classes especiais.

!!! info

#ifndef HEADER_${generatedId}_H
#define HEADER_${generatedId}_H

<%
includes.each { include ->
    out.println "#include \"$include\""
}
%>

int function_${generatedId}();

	XExtAuthzAllow                    = "allow"
	XExtAuthzCheckReceived            = "X-Ext-Authz-Check-Received"
	XExtAuthzAdditionalHeaderOverride = "X-Ext-Authz-Additional-Header-Override"
	GRPCAdditionalHeaderOverrideValue = "grpc-additional-header-override-value"

  configuration.
upgradeNotes:
  - title: Host header fallback disabled by default for Prometheus metrics for *all* inbound traffic.
    content: |
      Host header fallback for determining values for Prometheus `destination_service` labels has been disabled for all incoming traffic.
      Previously, this was disabled *only* for traffic arriving at Gateways. If you are relying on host header fallback behavior to properly

 * limitations under the License.
 */
package okhttp3.internal.http2

import okio.ByteString
import okio.ByteString.Companion.encodeUtf8

/** HTTP header: the name is an ASCII string, but the value can be UTF-8. */
data class Header(
  /** Name in case-insensitive ASCII encoding. */
  @JvmField val name: ByteString,
  /** Value in UTF-8 encoding. */
  @JvmField val value: ByteString,
) {