get() = "Dalvik" == System.getProperty("java.vm.name")

    private val isConscryptPreferred: Boolean
      get() {
        val preferredProvider = Security.getProviders()[0].name
        return "Conscrypt" == preferredProvider
      }

    private val isOpenJSSEPreferred: Boolean
      get() {
        val preferredProvider = Security.getProviders()[0].name
        return "OpenJSSE" == preferredProvider
      }

    val heldCertificate = HeldCertificate.Builder().build()
    val certificate = heldCertificate.certificate
    assertThat(certificate.getSubjectX500Principal().name, "self-signed")
      .isEqualTo(certificate.getIssuerX500Principal().name)
    assertThat(certificate.getIssuerX500Principal().name).matches(Regex("CN=[0-9a-f-]{36}"))
    assertThat(certificate.serialNumber).isEqualTo(BigInteger.ONE)
    assertThat(certificate.subjectAlternativeNames).isNull()

          }
        }
      }
    }

    fun redactHeader(name: String) {
      val newHeadersToRedact = TreeSet(String.CASE_INSENSITIVE_ORDER)
      newHeadersToRedact += headersToRedact
      newHeadersToRedact += name
      headersToRedact = newHeadersToRedact
    }

    fun redactQueryParams(vararg name: String) {
      val newQueryParamsNameToRedact = TreeSet(String.CASE_INSENSITIVE_ORDER)

    derWriter.write(
      name = "test",
      tagClass = DerHeader.TAG_CLASS_UNIVERSAL,
      tag = 16L,
    ) {
      derWriter.write(
        name = "test",
        tagClass = DerHeader.TAG_CLASS_UNIVERSAL,
        tag = 21L,
      ) {
        derWriter.writeOctetString("Smith".encodeUtf8())
      }

      derWriter.write(
        name = "test",

 * verification).
 */
private val VERIFY_AS_IP_ADDRESS = "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)".toRegex()

/** Returns true if this string is not a host name and might be an IP address. */
fun String.canParseAsIpAddress(): Boolean = VERIFY_AS_IP_ADDRESS.matches(this)

/**
 * Returns true if the length is not valid for DNS (empty or greater than 253 characters), or if any

    Android 10. Android uses reflection to look up a magic `checkServerTrusted()` method and we
    didn't have it.
 *  Fix: Explicitly specify the remote server name when making HTTPS connections on Android 5. In
    4.3.0 we introduced a regression where server name indication (SNI) was broken on Android 5.


## Version 4.3.0

_2019-12-31_

    ) = commonAdd(name, value)

    /**
     * Add a header with the specified name and value. Does validation of header names, allowing
     * non-ASCII values.
     */
    fun addUnsafeNonAscii(
      name: String,
      value: String,
    ) = apply {
      headersCheckName(name)
      addLenient(name, value)
    }

    /**
     * Adds all headers from an existing collection.
     */

    fun setHeader(
      name: String,
      value: Any,
    ) = apply {
      removeHeader(name)
      addHeader(name, value)
    }

    /** Removes all headers named [name]. */
    fun removeHeader(name: String) =
      apply {
        headers.removeAll(name)
      }

    fun body(body: Buffer) = body(body.toMockResponseBody())

        this.handshake = handshake
      }

    /**
     * Sets the header named [name] to [value]. If this request already has any headers
     * with that name, they are all replaced.
     */
    open fun header(
      name: String,
      value: String,
    ) = commonHeader(name, value)

    /**
     * Adds a header with [name] to [value]. Prefer this method for multiply-valued
     * headers like "Set-Cookie".

 * TLS:
 *
 *  * **A common name.** This is a string identifier for the certificate. It usually describes the
 *    purpose of the certificate like "Entrust Root Certification Authority - G2" or
 *    "www.squareup.com".
 *
 *  * **A set of hostnames.** These are in the certificate's subject alternative name (SAN)
 *    extension. A subject alternative name is either a literal hostname (`squareup.com`), a literal