### Download

```kotlin
testImplementation("com.squareup.okhttp3:okhttp-dnsoverhttps:4.12.0")
```

### Usage

```
  val appCache = Cache(File("cacheDir", "okhttpcache"), 10 * 1024 * 1024)
  val bootstrapClient = OkHttpClient.Builder().cache(appCache).build()

  val dns = DnsOverHttps.Builder().client(bootstrapClient)
    .url("https://dns.google/dns-query".toHttpUrl())

OkHttp 4.x Change Log
=====================

## Version 4.12.0

_2023-10-16_

 *  Fix: Don't hang taking headers for HTTP 103 responses.

 *  Fix: Recover gracefully when a cache entry's certificate is corrupted.

 *  Fix: Fail permanently when there's a failure loading the bundled public suffix database.
    This is the dataset that powers `HttpUrl.topPrivateDomain()`.

 */
class Relay private constructor(
  /**
   * Read/write persistence of the upstream source and its metadata. Its layout is as follows:
   *
   *  * 16 bytes: either `OkHttp cache v1\n` if the persisted file is complete. This is another
   *    sequence of bytes if the file is incomplete and should not be used.
   *  * 8 bytes: *n*: upstream data size
   *  * 8 bytes: *m*: metadata size

add headers with a fluent builder API.

```java
MockResponse response = new MockResponse()
    .addHeader("Content-Type", "application/json; charset=utf-8")
    .addHeader("Cache-Control", "no-cache")
    .setBody("{}");
```

MockResponse can be used to simulate a slow network. This is useful for
testing timeouts and interactive testing.

```java
response.throttleBody(1024, 1, TimeUnit.SECONDS);

import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.assertHeld
import okhttp3.internal.assertNotHeld
import okhttp3.internal.assertThreadDoesntHoldLock
import okhttp3.internal.cache.CacheInterceptor
import okhttp3.internal.closeQuietly
import okhttp3.internal.connection.Locks.withLock
import okhttp3.internal.http.BridgeInterceptor
import okhttp3.internal.http.CallServerInterceptor

    )
    assertThat(connect.headers["Host"]).isEqualTo("android.com:443")
  }

  private fun initResponseCache() {
    cache = Cache(tempDir, Int.MAX_VALUE.toLong())
    client =
      client.newBuilder()
        .cache(cache)
        .build()
  }

  /** Test which headers are sent unencrypted to the HTTP proxy.  */
  @Test
  fun proxyConnectIncludesProxyHeadersOnly() {

  /**
   * Closes the cache and deletes all of its stored values. This will delete all files in the cache
   * directory including files that weren't created by the cache.
   */
  @Throws(IOException::class)
  fun delete() {
    cache.delete()
  }

  /**
   * Deletes all values stored in the cache. In-flight writes to the cache will complete normally,
   * but the corresponding responses will not be stored.
   */

import okio.Source
import okio.Timeout
import okio.buffer

/** Serves requests from the cache and writes responses to the cache. */
class CacheInterceptor(internal val cache: Cache?) : Interceptor {
  @Throws(IOException::class)
  override fun intercept(chain: Interceptor.Chain): Response {
    val call = chain.call()
    val cacheCandidate = cache?.get(chain.request().requestForCache())

    val now = System.currentTimeMillis()

    cache = buildCache("/cache/".toPath(), Int.MAX_VALUE.toLong(), loggingFileSystem)
    client =
      clientTestRule.newClientBuilder()
        .cache(cache)
        .cookieJar(JavaNetCookieJar(cookieManager))
        .build()
  }

  @AfterEach
  fun tearDown() {
    ResponseCache.setDefault(null)
    if (this::cache.isInitialized) {
      cache.delete()
    }
  }

  @Test

  }

  companion object {
    /**
     * Cache control request directives that require network validation of responses. Note that such
     * requests may be assisted by the cache via conditional GET requests.
     */
    @JvmField
    val FORCE_NETWORK = commonForceNetwork()

    /**
     * Cache control request directives that uses the cache only, even if the cached response is