}

    @Override public Response intercept(Chain chain) throws IOException {
      Request request = chain.request();
      if (request.url().host().equals(host)) {
        request = request.newBuilder()
            .header("Authorization", credentials)
            .build();
      }
      return chain.proceed(request);
    }
  }

package http

import (
	"bytes"
	"io"
)

// RequestRecorder - records the
// of a given io.Reader
type RequestRecorder struct {
	// Data source to record
	io.Reader
	// Response body should be logged
	LogBody bool

	// internal recording buffer
	buf bytes.Buffer
	// total bytes read including header size
	bytesRead int
}

// Close is a no operation closer
func (r *RequestRecorder) Close() error {

# Utilizando o Request diretamente { #using-the-request-directly }

Até agora você declarou as partes da requisição que você precisa utilizando os seus tipos.

Obtendo dados de:

* O path como parâmetros.
* Cabeçalhos (*Headers*).
* Cookies.
* etc.

E ao fazer isso, o **FastAPI** está validando as informações, convertendo-as e gerando documentação para a sua API automaticamente.

func (z BackendType) Msgsize() (s int) {
	s = msgp.IntSize
	return
}

// MarshalMsg implements msgp.Marshaler
func (z *BucketInfo) MarshalMsg(b []byte) (o []byte, err error) {
	o = msgp.Require(b, z.Msgsize())
	// map header, size 5
	// string "Name"
	o = append(o, 0x85, 0xa4, 0x4e, 0x61, 0x6d, 0x65)
	o = msgp.AppendString(o, z.Name)
	// string "Created"
	o = append(o, 0xa7, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64)

        byte[] encoded = AvPairs.encode(pairs);

        assertNotNull(encoded, "Encoded data should not be null");

        int expectedLength = 4 + 4 + // AvFlags header + data
                4 + 8 + // AvTimestamp header + data
                4 + 4 + // AvTargetName header + data
                4; // EOL
        assertEquals(expectedLength, encoded.length, "Encoded length should match expected");

        // Verify EOL at the end

     *
     * @return the errorContextCount
     */
    public final byte getErrorContextCount() {
        return this.errorContextCount;
    }

    /**
     * Gets the header start position for this message.
     *
     * @return the headerStart
     */
    public final int getHeaderStart() {
        return this.headerStart;
    }

    /**

package cmd

import (
	"github.com/tinylib/msgp/msgp"
)

// MarshalMsg implements msgp.Marshaler
func (z *MetricDescription) MarshalMsg(b []byte) (o []byte, err error) {
	o = msgp.Require(b, z.Msgsize())
	// map header, size 5
	// string "Namespace"
	o = append(o, 0x85, 0xa9, 0x4e, 0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65)
	o = msgp.AppendString(o, string(z.Namespace))
	// string "Subsystem"

          Credentials.basic(
            auth.userName,
            String(auth.password),
            challenge.charset,
          )
        return request
          .newBuilder()
          .header(credentialHeader, credential)
          .build()
      }
    }

    return null // No challenges were satisfied!
  }

  @Throws(IOException::class)
  private fun Proxy.connectToInetAddress(

  /*
   * This method was rewritten in Java from an intermediate step of the Murmur hash function in
   * http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp, which contained the
   * following header:
   *
   * MurmurHash3 was written by Austin Appleby, and is placed in the public domain. The author
   * hereby disclaims copyright to this source code.
   */
  static int smear(int hashCode) {

## Zusammenfassung { #summary }

Sie können **Pydantic-Modelle** verwenden, um **Query-Parameter** in **FastAPI** zu deklarieren. 😎

/// tip | Tipp

Spoiler-Alarm: Sie können auch Pydantic-Modelle verwenden, um Cookies und Header zu deklarieren, aber darüber werden Sie später im Tutorial lesen. 🤫