assertFailure { httpUrl.topPrivateDomain() }.all {
      hasMessage("Unable to load PublicSuffixDatabase.list resource.")
      cause().isNotNull().all {
        hasMessage(
          "Platform applicationContext not initialized. " +
            "Startup Initializer possibly disabled, " +
            "call OkHttp.initialize before test.",
        )
        hasClass<IOException>()
      }
    }
  }

  companion object {

### Performance Optimizations
- **Caching** - Bean descriptors and reflection metadata are cached for improved performance
- **Lazy initialization** - Resources and expensive operations are initialized only when needed  
- **Memory efficient** - Specialized collections like `LruHashMap` and `ArrayMap` for memory-conscious applications
- **Java 21 features** - Switch expressions and pattern matching for reduced overhead

    }.apply {
      timeout(client.callTimeoutMillis.toLong(), MILLISECONDS)
    }

  private val executed = AtomicBoolean()

  // These properties are only accessed by the thread executing the call.

  /** Initialized in [callStart]. */
  private var callStackTrace: Any? = null

  /** Finds an exchange to send the next request and receive the next response. */
  private var exchangeFinder: ExchangeFinder? = null