All providers support HTTP/1.1 and TLSv1.2.


[BoringSSL]: https://boringssl.googlesource.com/boringssl/
[Bouncy Castle]: https://www.bouncycastle.org/java.html
[Conscrypt]: https://www.conscrypt.org/
[Corretto]: https://github.com/corretto/amazon-corretto-crypto-provider
[GraalVM]: https://www.graalvm.org/
[OpenJDK]: https://openjdk.java.net/groups/security/

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

/** http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-7 */
enum class ErrorCode constructor(val httpCode: Int) {
  /** Not an error!  */
  NO_ERROR(0),

  PROTOCOL_ERROR(1),

  INTERNAL_ERROR(2),

  FLOW_CONTROL_ERROR(3),

```

The best way to verify artifacts is [automatically with Gradle][gradle_verification].


[gradle_verification]: https://docs.gradle.org/current/userguide/dependency_verification.html#sec:signature-verification

import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Test
import org.junit.runner.RunWith

/**
 * Apache HttpClient 5.x.
 *
 * https://hc.apache.org/httpcomponents-client-5.0.x/index.html
 */
@RunWith(AndroidJUnit4::class)
class ApacheHttpClientTest {
  private var httpClient = HttpClients.createDefault()

  @After fun tearDown() {
    httpClient.close()
  }

  @Test fun get() {

  }

  /**
   * This is not defined in the protocol but some servers won't add the leading empty space when the
   * message is empty. http://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html#sec6.1
   */
  @Test
  fun emptyMessageAndNoLeadingSpace() {
    val version = 1
    val code = 503
    val statusLine = parse("HTTP/1.$version $code")
    assertThat(statusLine.message).isEqualTo("")

    throw IllegalArgumentException("failed to decode certificate", e)
  }
}

/**
 * Returns the certificate encoded in [PEM format][rfc_7468].
 *
 * [rfc_7468]: https://tools.ietf.org/html/rfc7468
 */
fun X509Certificate.certificatePem(): String {
  return buildString {
    append("-----BEGIN CERTIFICATE-----\n")
    encodeBase64Lines(encoded.toByteString())
    append("-----END CERTIFICATE-----\n")
  }

      "xn--a.ß",
      "xn--a.xn--zca",
      "xn--a-yoc",
      // OkHttp doesn't reject U+FFFD encoded in Punycode.
      "xn--zn7c.com",
      // OkHttp doesn't reject a U+200D. https://www.rfc-editor.org/rfc/rfc5892.html#appendix-A.2
      "xn--1ug.example",
      // OkHttp doesn't implement CheckJoiners.
      "\u200D.example",
      // OkHttp doesn't implement CheckBidi.
      "يa",
    )

  @Test
  fun test() {

class StringprepTablesReader(
  private val fileSystem: FileSystem,
) {
  /**
   * Returns a [Stringprep] that uses the tables of Nameprep ([RFC 3491]).
   *
   * [RFC 3491]: https://datatracker.ietf.org/doc/html/rfc3491
   */
  fun readNameprep(base: Path): Stringprep {
    val unassigned = readCodePointSet(base / "rfc3454.A.1.txt")
    val mapping =
      MappingListCodePointMapping(
        mutableMapOf<Int, String>()

See the License for the specific language governing permissions and
limitations under the License.
```

 [bom]: https://docs.gradle.org/6.2/userguide/platforms.html#sub:bom_import
 [changelog]: https://square.github.io/okhttp/changelog/
 [conscrypt]: https://github.com/google/conscrypt/

User-Agent: OkHttp Example
Host: www.publicobject.com
Connection: Keep-Alive
Accept-Encoding: gzip

INFO: Received response for http://www.publicobject.com/helloworld.txt in 115.6ms
Server: nginx/1.4.6 (Ubuntu)
Content-Type: text/html
Content-Length: 193
Connection: keep-alive
Location: https://publicobject.com/helloworld.txt