```kotlin
    val response: Response = call.execute()
    val multipartReader = MultipartReader(response.body!!)

    multipartReader.use {
      while (true) {
        val part = multipartReader.nextPart() ?: break
        process(part.headers, part.body)
      }
    }
    ```

 *  New: `MediaType.parameter()` gets a parameter like `boundary` from a media type like
    `multipart/mixed; boundary="abc"`.

        boundary = "simple boundary",
        source = Buffer().writeUtf8(multipart),
      )

    val part = parts.nextPart()!!
    assertThat(part.body.readUtf8()).isEqualTo("abcd\r\n--simple boundar\r\n\r\nefgh")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `do not need to read entire part`() {
    val multipart =
      """
      |--simple boundary
      |
      |abcd
      |efgh

 *    or after it ends.
 *
 *  * **A public key.** This cryptographic key is used for asymmetric encryption digital signatures.
 *    Note that the private key is not a part of the certificate!
 *
 *  * **A signature issued by another certificate's private key.** This mechanism allows a trusted
 *    third-party to endorse a certificate. Third parties should only endorse certificates once

          this.type = type
        }

      /** Add a part to the body. */
      fun addPart(body: RequestBody) =
        apply {
          addPart(Part.create(body))
        }

      /** Add a part to the body. */
      fun addPart(
        headers: Headers?,
        body: RequestBody,
      ) = apply {
        addPart(Part.create(headers, body))
      }

    val requestBody: RequestBody = "".toRequestBody(null)
    var part: MultipartBody.Part = MultipartBody.Part.create(null, requestBody)
    part = MultipartBody.Part.create(headersOf(), requestBody)
    part = MultipartBody.Part.create(requestBody)
    part = MultipartBody.Part.createFormData("", "")
    part = MultipartBody.Part.createFormData("", "", requestBody)
    part = MultipartBody.Part.createFormData("", null, requestBody)

      }

      else -> throw IOException("unexpected journal line: $line")
    }
  }

  /**
   * Computes the initial size and collects garbage as a part of opening the cache. Dirty entries
   * are assumed to be inconsistent and will be deleted.
   */
  @Throws(IOException::class)
  private fun processJournal() {
    fileSystem.deleteIfExists(journalFileTmp)

          the Derivative Works; and

      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
          include a readable copy of the attribution notices contained
          within such NOTICE file, excluding those notices that do not
          pertain to any part of the Derivative Works, in at least one

 * **MockResponse**: headers, http2ErrorCode, socketPolicy, status, trailers
 * **MockWebServer**: bodyLimit, port, protocolNegotiationEnabled, protocols, requestCount,
   serverSocketFactory
 * **MultipartBody.Part**: body, headers
 * **MultipartBody.**: boundary, parts, size, type
 * **OkHttpClient**: authenticator, cache, callTimeoutMillis, certificatePinner,

`MultipartBody.Builder` can build sophisticated request bodies compatible with HTML file upload forms. Each part of a multipart request body is itself a request body, and can define its own headers. If present, these headers should describe the part body, such as its `Content-Disposition`. The `Content-Length` and `Content-Type` headers are added automatically if they're available.

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