## Version 5.0.0-alpha.17

_2025-06-29_

This release stabilizes many APIs for the imminent OkHttp 5.0.0 release.

 *  New: `TrailersSource`, a public API for HTTP trailers. Production callers shouldn't need this
    as the API to read response trailers is unchanged. Testers may use this new stable API to
    supply trailers for a `Response`.

    val builtRequestWithoutCache = requestWithoutCache.newBuilder().url("http://localhost/api/foo").build()
    assertThat(builtRequestWithoutCache.url).isEqualTo(
      "http://localhost/api/foo".toHttpUrl(),
    )
    val requestWithCache =
      Request
        .Builder()
        .url("http://localhost/api")
        .build()
    // cache url object

  fun uninitializedURI() {
    val request = Request.Builder().url("http://localhost/api").build()
    assertThat(request.url.toUri()).isEqualTo(URI("http://localhost/api"))
    assertThat(request.url).isEqualTo("http://localhost/api".toHttpUrl())
  }

  @Test
  fun newBuilderUrlResetsUrl() {
    val requestWithoutCache = Request.Builder().url("http://localhost/api").build()

    introduction to this new API.

 *  New: APIs to iterate and selectively clear the response cache.
 *  New: Support for SOCKS proxies.
 *  New: Support for `TLS_FALLBACK_SCSV`.
 *  New: Update HTTP/2 support to `h2-16` and `hpack-10`.
 *  New: APIs to prevent retrying non-idempotent requests.
 *  Fix: Drop NPN support. Going forward we support ALPN only.

/**
 * Signifies that a public API (public class, method or field) is subject to incompatible changes,
 * or even removal, in a future release. An API bearing this annotation is exempt from any
 * compatibility guarantees made by its containing library. Note that the presence of this
 * annotation implies nothing about the quality or performance of the API in question, only the fact
 * that it is not "API-frozen."
 *

/**
 * Signifies that a public API (public class, method or field) is subject to incompatible changes,
 * or even removal, in a future release. An API bearing this annotation is exempt from any
 * compatibility guarantees made by its containing library. Note that the presence of this
 * annotation implies nothing about the quality or performance of the API in question, only the fact
 * that it is not "API-frozen."
 *

Code Cleanup
------------

IntelliJ and Android Studio offer a **Code Cleanup** feature that will automatically update
deprecated APIs with their replacements. Access this feature from the _Search Anywhere_ dialog
(double-press shift) or under the _Analyze_ menu.

We’ve included deprecated APIs in OkHttp 4.0 because they make migration easy. We will remove them

     */
    protected enum FormatType {
        /** Search API format. */
        SEARCH,
        /** Label API format. */
        LABEL,
        /** Popular word API format. */
        POPULARWORD,
        /** Favorite API format. */
        FAVORITE,
        /** Favorites API format. */
        FAVORITES,
        /** Ping API format. */
        PING,
        /** Scroll API format. */

things you should know about contributing:

1.  API changes require discussion, use cases, etc. Code comes later.
2.  Pull requests are great for small fixes for bugs, documentation, etc.
3.  Pull requests are not merged directly into the master branch.
4.  Code contributions require signing a Google CLA.

API changes
-----------

We make changes to Guava's public [APIs][], including adding new APIs, very

| ------- | ------------------- | -------------------------------------------- |
| 5.x     | ✅                  | APIs subject to change in alpha releases.    |
| 4.x     | ✅                  | Android 5.0+ (API level 21+) and on Java 8+. |
| 3.x     | ❌ Ended 2021-12-31 | Android 2.3+ (API level 9+) and Java 7+.     |


## Reporting a Vulnerability