apple · guoye-zhang · May 19, 2026
diff --git a/Examples/EchoServer/EchoServer.swift b/Examples/EchoServer/EchoServer.swift
@@ -14,7 +14,7 @@
 import HTTPAPIs
 
 /// This examples shows an HTTP echo server.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 @main
 struct EchoServer {
     static func main() async throws {

diff --git a/Examples/ExampleMiddleware/ForwardingMiddleware.swift b/Examples/ExampleMiddleware/ForwardingMiddleware.swift
@@ -25,7 +25,7 @@ public struct ForwardingMiddleware<Input: ~Copyable & ~Escapable>: Middleware {
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension Middleware {
     public func forwarding() -> ForwardingMiddleware<Input> {
         ForwardingMiddleware()

diff --git a/Examples/ExampleMiddleware/HTTPServerLoggingMiddleware.swift b/Examples/ExampleMiddleware/HTTPServerLoggingMiddleware.swift
@@ -21,7 +21,7 @@ public import Middleware
 /// decorators that output information about the HTTP request path, method, response status,
 /// and the number of bytes read from the request body and written to the response body.
 /// This middleware is useful for debugging and monitoring HTTP traffic.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPServerLoggingMiddleware<
     RequestConcludingAsyncReader: ConcludingAsyncReader & ~Copyable,
     ResponseConcludingAsyncWriter: ConcludingAsyncWriter & ~Copyable
@@ -98,7 +98,7 @@ where
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension Middleware where Input: ~Copyable, NextInput: ~Copyable {
     /// Creates logging middleware for HTTP servers.
     ///
@@ -135,7 +135,7 @@ extension Middleware where Input: ~Copyable, NextInput: ~Copyable {
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPRequestLoggingConcludingAsyncReader<
     Base: ConcludingAsyncReader & ~Copyable
 >: ConcludingAsyncReader, ~Copyable
@@ -201,7 +201,7 @@ where
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPResponseLoggingConcludingAsyncWriter<
     Base: ConcludingAsyncWriter & ~Copyable
 >: ConcludingAsyncWriter, ~Copyable

diff --git a/Examples/ExampleMiddleware/HTTPServerMiddlewareInput.swift b/Examples/ExampleMiddleware/HTTPServerMiddlewareInput.swift
@@ -19,7 +19,7 @@ public import HTTPAPIs
 /// request body reader, and response sender. This boxing is necessary because some of these
 /// parameters are `~Copyable` types that cannot be stored in tuples, and it provides a
 /// convenient way to pass all request-handling components through the middleware chain.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPServerMiddlewareInput<
     RequestReader: ConcludingAsyncReader & ~Copyable,
     ResponseWriter: ConcludingAsyncWriter & ~Copyable

diff --git a/Examples/ExampleMiddleware/HTTPServerRequestHandlerMiddleware.swift b/Examples/ExampleMiddleware/HTTPServerRequestHandlerMiddleware.swift
@@ -19,7 +19,7 @@ public import Middleware
 /// ``HTTPServerRequestHandlerMiddleware`` serves as an example terminal middleware that reads
 /// the entire request body and writes it back as the response body with a 200 OK status.
 /// This middleware has `Never` as its `NextInput` type, indicating it's the end of the chain.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPServerRequestHandlerMiddleware<
     RequestConcludingAsyncReader: ConcludingAsyncReader & ~Copyable,
     ResponseConcludingAsyncWriter: ConcludingAsyncWriter & ~Copyable,
@@ -63,7 +63,7 @@ where
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension Middleware where Input: ~Copyable, NextInput: ~Copyable {
     /// Creates a request handler middleware that echoes the request body back as the response.
     ///

diff --git a/Examples/MiddlewareClient/ExampleMiddlewareClient.swift b/Examples/MiddlewareClient/ExampleMiddlewareClient.swift
@@ -14,7 +14,7 @@
 import HTTPAPIs
 import Middleware
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 struct ExampleMiddlewareClient<Client: HTTPClient & ~Copyable, ClientMiddleware: Middleware<HTTPRequest, HTTPRequest>>: HTTPClient, ~Copyable {
     typealias RequestOptions = Client.RequestOptions
     typealias RequestWriter = Client.RequestWriter
@@ -56,7 +56,7 @@ struct ExampleMiddlewareClient<Client: HTTPClient & ~Copyable, ClientMiddleware:
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 struct RequestMiddleware<Client: HTTPClient & ~Copyable>: Middleware {
     typealias Input = HTTPRequest
     typealias NextInput = Input

diff --git a/Examples/MiddlewareClient/MiddlewareClient.swift b/Examples/MiddlewareClient/MiddlewareClient.swift
@@ -18,7 +18,7 @@ import Logging
 import Middleware
 
 /// This example shows how to use middleware together with an HTTP client.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 @main
 struct MiddlewareClient {
     static func main() async throws {

diff --git a/Examples/MiddlewareServer/ExampleMiddlewareServer.swift b/Examples/MiddlewareServer/ExampleMiddlewareServer.swift
@@ -17,7 +17,7 @@ import Logging
 import Middleware
 
 /// This is an example server that wraps an HTTP server inside a middleware.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 struct ExampleMiddlewareServer<
     Server: HTTPServer,
     ServerMiddleware: Middleware & Sendable
@@ -62,7 +62,7 @@ where
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 struct RequestMiddleware<Server: HTTPServer>: Middleware
 where
     Server.RequestConcludingReader: ~Copyable,

diff --git a/Examples/MiddlewareServer/MiddlewareServer.swift b/Examples/MiddlewareServer/MiddlewareServer.swift
@@ -17,7 +17,7 @@ import Logging
 import Middleware
 
 /// This example shows how to use middleware together with an HTTP server.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 @main
 struct MiddlewareServer {
     static func main() async throws {

diff --git a/Examples/ProxyServer/ProxyServer.swift b/Examples/ProxyServer/ProxyServer.swift
@@ -18,7 +18,7 @@ import Synchronization
 ///
 /// Every incoming request is proxied via an HTTP client. This supports full bi-directional streaming
 /// and trailers.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 @main
 struct ProxyServer {
     static func main() async throws {

diff --git a/Sources/AHCHTTPClient/AHC+HTTPClient.swift b/Sources/AHCHTTPClient/AHC+HTTPClient.swift
@@ -20,7 +20,7 @@ import NIOCore
 import NIOHTTP1
 import Synchronization
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension AsyncHTTPClient.HTTPClient: HTTPAPIs.HTTPClient {
     public typealias RequestWriter = RequestBodyWriter
     public typealias ResponseConcludingReader = ResponseReader

diff --git a/Sources/FetchHTTPClient/FetchHTTPClient.swift b/Sources/FetchHTTPClient/FetchHTTPClient.swift
@@ -36,7 +36,6 @@ enum FetchError: Error {
     case TrailersUnsupported
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, *)
 public final class FetchHTTPClient: HTTPAPIs.HTTPClient {
     public typealias RequestWriter = RequestBodyWriter
     public typealias ResponseConcludingReader = ResponseReader

diff --git a/Sources/HTTPAPIs/AsyncWriter+AsyncReader.swift b/Sources/HTTPAPIs/AsyncWriter+AsyncReader.swift
@@ -13,7 +13,7 @@
 
 public import AsyncStreaming
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension AsyncWriter where Self: ~Copyable, Self: ~Escapable {
     /// Writes all elements from an async reader to this writer.
     ///
@@ -35,9 +35,6 @@ extension AsyncWriter where Self: ~Copyable, Self: ~Escapable {
     /// // Copy all data from reader to writer
     /// try await fileWriter.write(dataReader)
     /// ```
-    #if compiler(<6.3)
-    @_lifetime(self: copy self)
-    #endif
     public mutating func write<Reader>(
         _ reader: consuming Reader
     ) async throws

diff --git a/Sources/HTTPAPIs/AsyncWriter.swift b/Sources/HTTPAPIs/AsyncWriter.swift
@@ -13,7 +13,7 @@
 
 public import AsyncStreaming
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension AsyncWriter where Self: ~Copyable, Self: ~Escapable {
     /// Writes the provided element to the underlying destination.
     ///
@@ -34,9 +34,6 @@ extension AsyncWriter where Self: ~Copyable, Self: ~Escapable {
     /// // Write data to a file asynchronously
     /// try await fileWriter.write(dataChunk)
     /// ```
-    #if compiler(<6.3)
-    @_lifetime(self: copy self)
-    #endif
     public mutating func write(_ element: consuming WriteElement) async throws(WriteFailure) {
         // Since the element is ~Copyable but we don't have call-once closures
         // we need to move it into an Optional and then take it out once. This
@@ -61,9 +58,6 @@ extension AsyncWriter where Self: ~Copyable, Self: ~Escapable {
     /// - Parameter span: The elements to write.
     ///
     /// - Throws: An error of type `WriteFailure` if the write operation cannot be completed successfully.
-    #if compiler(<6.3)
-    @_lifetime(self: copy self)
-    #endif
     public mutating func write(_ span: Span<WriteElement>) async throws(WriteFailure)
     where WriteElement: Copyable {
         do {

diff --git a/Sources/HTTPAPIs/Client/HTTPClient+Conveniences.swift b/Sources/HTTPAPIs/Client/HTTPClient+Conveniences.swift
@@ -19,7 +19,7 @@ public import struct Foundation.URL
 public import struct Foundation.Data
 #endif
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension HTTPClient
 where
     Self: ~Copyable & ~Escapable,
@@ -42,9 +42,6 @@ where
     /// - Returns: The value returned by the response handler closure.
     ///
     /// - Throws: An error if the request fails or if the response handler throws.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func perform<Return: ~Copyable>(
         request: HTTPRequest,
         body: consuming HTTPClientRequestBody<RequestWriter>? = nil,
@@ -69,9 +66,6 @@ where
     /// - Returns: A tuple containing the HTTP response header and the collected response body data.
     ///
     /// - Throws: An error if the request fails, if the response body exceeds the limit, or if collection fails.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func get(
         url: URL,
         headerFields: HTTPFields = [:],
@@ -103,9 +97,6 @@ where
     /// - Returns: A tuple containing the HTTP response header and the collected response body data.
     ///
     /// - Throws: An error if the request fails, if the response body exceeds the limit, or if collection fails.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func post(
         url: URL,
         headerFields: HTTPFields = [:],
@@ -138,9 +129,6 @@ where
     /// - Returns: A tuple containing the HTTP response header and the collected response body data.
     ///
     /// - Throws: An error if the request fails, if the response body exceeds the limit, or if collection fails.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func put(
         url: URL,
         headerFields: HTTPFields = [:],
@@ -173,9 +161,6 @@ where
     /// - Returns: A tuple containing the HTTP response header and the collected response body data.
     ///
     /// - Throws: An error if the request fails, if the response body exceeds the limit, or if collection fails.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func delete(
         url: URL,
         headerFields: HTTPFields = [:],
@@ -208,9 +193,6 @@ where
     /// - Returns: A tuple containing the HTTP response header and the collected response body data.
     ///
     /// - Throws: An error if the request fails, if the response body exceeds the limit, or if collection fails.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     public mutating func patch(
         url: URL,
         headerFields: HTTPFields = [:],

diff --git a/Sources/HTTPAPIs/Client/HTTPClient.swift b/Sources/HTTPAPIs/Client/HTTPClient.swift
@@ -15,7 +15,7 @@
 ///
 /// ``HTTPClient`` provides asynchronous request execution with streaming request
 /// and response bodies.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public protocol HTTPClient<RequestOptions>: Sendable, ~Copyable, ~Escapable {
     associatedtype RequestOptions: HTTPClientCapability.RequestOptions
 
@@ -51,9 +51,6 @@ public protocol HTTPClient<RequestOptions>: Sendable, ~Copyable, ~Escapable {
     /// - Returns: The value returned by the response handler closure.
     ///
     /// - Throws: An error if the request fails or if the response handler throws.
-    #if compiler(<6.3)
-    @_lifetime(&self)
-    #endif
     mutating func perform<Return: ~Copyable>(
         request: HTTPRequest,
         body: consuming HTTPClientRequestBody<RequestWriter>?,

diff --git a/Sources/HTTPAPIs/Client/HTTPClientCapability+RequestOptions.swift b/Sources/HTTPAPIs/Client/HTTPClientCapability+RequestOptions.swift
@@ -12,7 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 /// The namespace for all protocols defining HTTP client capabilities.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public enum HTTPClientCapability {
     /// The request options protocol.
     ///

diff --git a/Sources/HTTPAPIs/Client/HTTPClientCapability+TLSVersionSelection.swift b/Sources/HTTPAPIs/Client/HTTPClientCapability+TLSVersionSelection.swift
@@ -13,7 +13,7 @@
 
 public import NetworkTypes
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension HTTPClientCapability {
     /// A protocol for HTTP request options that support TLS version constraints.
     public protocol TLSVersionSelection: RequestOptions {

diff --git a/Sources/HTTPAPIs/Client/HTTPClientRequestBody+Data.swift b/Sources/HTTPAPIs/Client/HTTPClientRequestBody+Data.swift
@@ -17,7 +17,7 @@ public import struct FoundationEssentials.Data
 public import struct Foundation.Data
 #endif
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension HTTPClientRequestBody where Writer: ~Copyable {
     /// Creates a seekable request body from `Data`.
     ///

diff --git a/Sources/HTTPAPIs/Client/HTTPClientRequestBody.swift b/Sources/HTTPAPIs/Client/HTTPClientRequestBody.swift
@@ -50,7 +50,7 @@ import AsyncStreaming
 ///     // Handle the response
 /// }
 /// ```
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public struct HTTPClientRequestBody<Writer: AsyncWriter & ~Copyable>: Sendable
 where Writer.WriteElement == UInt8, Writer: SendableMetatype {
     /// The body can be asked to restart writing from an arbitrary offset.

diff --git a/Sources/HTTPAPIs/ConcludingAsyncReader+collect.swift b/Sources/HTTPAPIs/ConcludingAsyncReader+collect.swift
@@ -15,7 +15,7 @@ public import AsyncStreaming
 import BasicContainers
 public import ContainersPreview
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension ConcludingAsyncReader where Self: ~Copyable, Underlying: ~Copyable {
     /// Collects elements from the underlying async reader and returns both the processed result and final element.
     ///

diff --git a/Sources/HTTPAPIs/ConcludingAsyncReader.swift b/Sources/HTTPAPIs/ConcludingAsyncReader.swift
@@ -17,7 +17,7 @@
 /// provide a conclusive element after completing all reads. This is particularly useful
 /// for streams that have meaningful completion states beyond just terminating, such as
 /// HTTP responses that include headers after the reader finishes the body.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public protocol ConcludingAsyncReader<Underlying, FinalElement>: ~Copyable, ~Escapable {
     /// The underlying asynchronous reader type that produces elements.
     associatedtype Underlying: AsyncReader, ~Copyable, ~Escapable

diff --git a/Sources/HTTPAPIs/ConcludingAsyncWriter.swift b/Sources/HTTPAPIs/ConcludingAsyncWriter.swift
@@ -17,7 +17,7 @@
 /// provide a conclusive element after writing completes. This is particularly useful
 /// for streams that have meaningful completion states, such as HTTP responses that need
 /// to finalize with optional trailers.
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 public protocol ConcludingAsyncWriter<Underlying, FinalElement>: ~Copyable, ~Escapable {
     /// The underlying asynchronous writer type.
     associatedtype Underlying: AsyncWriter, ~Copyable, ~Escapable
@@ -47,7 +47,7 @@ public protocol ConcludingAsyncWriter<Underlying, FinalElement>: ~Copyable, ~Esc
     ) async throws -> Return
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension ConcludingAsyncWriter where Self: ~Copyable, Underlying: ~Copyable {
     /// Produces a final element using the underlying async writer without returning a separate value.
     ///
@@ -79,7 +79,7 @@ extension ConcludingAsyncWriter where Self: ~Copyable, Underlying: ~Copyable {
     }
 }
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 extension ConcludingAsyncWriter where Self: ~Copyable, Underlying: ~Copyable {
     /// Writes a single element to the underlying writer and concludes with a final element.
     ///

diff --git a/Sources/HTTPAPIs/Server/HTTPServer.swift b/Sources/HTTPAPIs/Server/HTTPServer.swift
@@ -11,7 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-@available(macOS 26.2, iOS 26.2, watchOS 26.2, tvOS 26.2, visionOS 26.2, *)
+@available(anyAppleOS 26.0, *)
 /// A protocol that defines the interface for an HTTP server.
 ///
 /// ``HTTPServer`` provides the contract for server implementations that accept