3.1.1

What's Changed

• Set JVM target to 1.8 for improved compatibility by @tiper in #11

Full Changelog: 3.1.0...3.1.1

3.1.0

What's New

A correctness release. The plugin now plays nicely with libraries that cancel and restart coroutines on recomposition.

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🐛 Bug Fixes

• Cancellation incorrectly propagated to non-cancelled waiters — if one coroutine cancelled, other still-active waiters could get hit with a CancellationException they didn't ask for. They now correctly retry as a deduplicated group and get their response.
• Premature entry removal — the first waiter to finish could remove the shared entry from the map while others were still using it.
• Cleanup skipped under cancellation — mutex.withLock inside finally could be interrupted by CancellationException when the coroutine was already cancelled, leaving stale entries in the map.

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✨ Improvements

• minWindow — new config option that holds the response open for a minimum number of milliseconds, giving late-joining concurrent requests a chance to deduplicate against fast responses (errors, cache hits, etc.).

  install(RequestDeduplication) {
      minWindow = 50 // ms
  }

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Full Changelog: 3.0.0...3.1.0

3.0.0

This release adds full Ktor 3.0.0+ support and expands Kotlin Multiplatform target coverage. The request deduplication behavior remains the same, now validated against Ktor 3.x.

Highlights

• Ktor 3.0.0+ support
• Expanded platform targets (including WebAssembly and Android Native)
• Aligned versioning: use plugin v3.x.x with Ktor 3.x

Supported Platforms (v3.x.x)

• ✅ JVM (Java 8+)
• ✅ Android (API 21+)
• ✅ Android Native (arm32, arm64, x86, x64)
• ✅ iOS (arm64, x64, simulatorArm64)
• ✅ tvOS (x64, arm64, simulatorArm64)
• ✅ watchOS (arm32, arm64, x64, simulatorArm64, deviceArm64)
• ✅ macOS (x64, arm64)
• ✅ Linux (x64, arm64)
• ✅ Windows (mingwX64)
• ✅ JavaScript (Browser, Node.js)
• ✅ WebAssembly (wasmJs - Browser, Node.js)

Compatibility

• Plugin v3.x.x → Ktor 3.0.0+
• Plugin v2.x.x → Ktor 2.3.0+

Installation

dependencies {
    implementation("io.github.tiper:ktor-client-deduplication:3.x.x")
}

Upgrade Guidance

• If you are on Ktor 2.x, stay on v2.x.x of this plugin.
• If you upgrade to Ktor 3.x, switch to v3.x.x.

2.0.0

🎉 First production-ready release of Ktor Client Request Deduplication

✨ Features

Deduplication

• Prevents duplicate concurrent HTTP requests
• Multiple identical requests → one actual HTTP call
• Configurable by HTTP method and headers

Performance

• O(1) deduplication check
• ~500ns overhead per request (0.0005% of network time)
• Smart memory sharing: 1MB × 10 callers = 1MB memory (not 10MB)

Safety

• Thread-safe (Mutex synchronization)
• Proper cancellation handling (SupervisorJob)
• Error response deduplication
• 29 comprehensive unit tests