Lowered minimum deployment versions for iOS and Mac Catalyst to allow launch on iOS versions 15 and 16

Package.swift

@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v14), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v17), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),

Package@swift-6.0.swift

@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v14), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v17), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),

Package@swift-6.1.swift

@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v14), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v17), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),

Sources/Hummingbird/Application.swift

@@ -91,6 +91,12 @@ extension ApplicationProtocol {
 extension ApplicationProtocol {
     /// Construct application and run it
     public func run() async throws {
+        // `#available()` logic must be placed within this method as Service
+        // protocol requires `run()` method is available from iOS 13+
+        guard #available(iOS 17.0, *) else {
+            return
+        }
+
         let dateCache = DateCache()
         let responder = try await self.responder
 

Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedForm+Request.swift

@@ -6,6 +6,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+@available(iOS 16, *)
 extension URLEncodedFormEncoder: ResponseEncoder {
     /// Extend URLEncodedFormEncoder to support generating a ``HummingbirdCore/Response``. Sets body and header values
     /// - Parameters:
@@ -26,6 +27,7 @@ extension URLEncodedFormEncoder: ResponseEncoder {
     }
 }
 
+@available(iOS 16, *)
 extension URLEncodedFormDecoder: RequestDecoder {
     /// Extend URLEncodedFormDecoder to decode from ``HummingbirdCore/Request``.
     /// - Parameters:

Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormDecoder.swift

@@ -9,6 +9,7 @@
 public import Foundation
 
 /// The wrapper struct for decoding URL encoded form data to Codable classes
+@available(iOS 16, *)
 public struct URLEncodedFormDecoder: Sendable {
     /// The strategy to use for decoding `Date` values.
     public enum DateDecodingStrategy: Sendable {
@@ -75,6 +76,7 @@ public struct URLEncodedFormDecoder: Sendable {
     }
 }
 
+@available(iOS 16, *)
 private class _URLEncodedFormDecoder: Decoder {
     // MARK: Properties
 
@@ -421,6 +423,7 @@ private class _URLEncodedFormDecoder: Decoder {
     }
 }
 
+@available(iOS 16, *)
 extension _URLEncodedFormDecoder: SingleValueDecodingContainer {
     func decodeNil() -> Bool {
         (try? self.unboxNil(self.storage.topContainer)) ?? false
@@ -487,6 +490,7 @@ extension _URLEncodedFormDecoder: SingleValueDecodingContainer {
     }
 }
 
+@available(iOS 16, *)
 extension _URLEncodedFormDecoder {
     func unboxNil(_ node: URLEncodedFormNode) throws -> Bool {
         switch node {
@@ -686,6 +690,7 @@ extension _URLEncodedFormDecoder {
     }
 }
 
+@available(iOS 16, *)
 private struct URLEncodedFormDecodingStorage {
     /// the container stack
     private var containers: [URLEncodedFormNode] = []

Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormEncoder.swift

@@ -9,6 +9,7 @@
 public import Foundation
 
 /// The wrapper struct for encoding Codable classes to URL encoded form data
+@available(iOS 16, *)
 public struct URLEncodedFormEncoder: Sendable {
     /// The strategy to use for encoding `Date` values.
     public enum DateEncodingStrategy: Sendable {
@@ -80,6 +81,7 @@ public struct URLEncodedFormEncoder: Sendable {
 }
 
 /// Internal QueryEncoder class. Does all the heavy lifting
+@available(iOS 16, *)
 private class _URLEncodedFormEncoder: Encoder {
     var codingPath: [any CodingKey]
 
@@ -273,6 +275,7 @@ private class _URLEncodedFormEncoder: Encoder {
     }
 }
 
+@available(iOS 16, *)
 extension _URLEncodedFormEncoder: SingleValueEncodingContainer {
     func encodeResult(_ value: URLEncodedFormNode) {
         self.storage.push(container: value)
@@ -310,6 +313,7 @@ extension _URLEncodedFormEncoder: SingleValueEncodingContainer {
     }
 }
 
+@available(iOS 16, *)
 extension _URLEncodedFormEncoder {
     func box(_ date: Date) throws -> URLEncodedFormNode {
         switch self.options.dateEncodingStrategy {
@@ -355,6 +359,7 @@ extension _URLEncodedFormEncoder {
 }
 
 /// storage for Query Encoder. Stores a stack of QueryEncoder containers, plus leaf objects
+@available(iOS 16, *)
 private struct URLEncodedFormEncoderStorage {
     /// the container stack
     private var containers: [URLEncodedFormNode] = []

Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormNode.swift

@@ -71,6 +71,7 @@ extension URLEncodedFormError {
     }
 }
 /// Internal representation of URL encoded form data used by both encode and decode
+@available(iOS 16, *)
 enum URLEncodedFormNode: CustomStringConvertible, Equatable {
     /// holds a value
     case leaf(NodeValue?)

Sources/Hummingbird/HTTP/Cookie.swift

@@ -13,6 +13,7 @@ public import Foundation
 #endif
 
 /// Structure holding a single cookie
+@available(iOS 16, *)
 public struct Cookie: Sendable, CustomStringConvertible {
     public struct ValidationError: Error {
         enum Reason {

Sources/Hummingbird/HTTP/Cookies.swift

@@ -9,6 +9,7 @@
 /// Structure holding an array of cookies
 ///
 /// Cookies can be accessed from request via `Request.cookies`.
+@available(iOS 16, *)
 public struct Cookies: Sendable {
     /// Construct cookies accessor from `Request`
     /// - Parameter request: request to get cookies from

Sources/Hummingbird/HTTP/Request+Cookies.swift

@@ -8,6 +8,7 @@
 
 public import HummingbirdCore
 
+@available(iOS 16, *)
 extension Request {
     /// access cookies from request. When accessing this for the first time the Cookies struct will be created
     public var cookies: Cookies {

Sources/Hummingbird/HTTP/Response+Cookies.swift

@@ -8,13 +8,15 @@
 
 public import HummingbirdCore
 
+@available(iOS 16, *)
 extension Response {
     /// Set cookie on response
     public mutating func setCookie(_ cookie: Cookie) {
         self.headers[values: .setCookie].append(cookie.description)
     }
 }
 
+@available(iOS 16, *)
 extension EditedResponse {
     /// Set cookie on reponse patch
     ///

Sources/Hummingbird/Middleware/FileMiddleware.swift

@@ -40,6 +40,7 @@ public protocol FileMiddlewareFileAttributes {
 /// "if-modified-since", "if-none-match", "if-range" and 'range" headers. It will output "content-length",
 /// "modified-date", "eTag", "content-type", "cache-control" and "content-range" headers where
 /// they are relevant.
+@available(iOS 16, *)
 public struct FileMiddleware<Context: RequestContext, Provider: FileProvider>: RouterMiddleware
 where Provider.FileAttributes: FileMiddlewareFileAttributes {
     let cacheControl: CacheControl
@@ -221,6 +222,7 @@ where Provider.FileAttributes: FileMiddlewareFileAttributes {
     }
 }
 
+@available(iOS 16, *)
 extension FileMiddleware {
     /// Whether to return data from the file or a not modified response
     private enum FileResult {

Sources/Hummingbird/Middleware/MiddlewareGroup.swift

@@ -7,6 +7,7 @@
 //
 
 /// Group of middleware that can be used to create a responder chain. Each middleware calls the next one
+@available(iOS 16, *)
 public final class MiddlewareGroup<Context> {
     var middlewares: [any MiddlewareProtocol<Request, Response, Context>]
 

Sources/Hummingbird/Middleware/TracingMiddleware.swift

@@ -28,6 +28,7 @@ import Foundation
 /// Swift-Distributed-Tracing has a flexible backend, which will need to be initialized before any traces are recorded.
 ///
 /// A list of implementations is available in the swift-distributed-tracing repository's README.
+@available(iOS 16, *)
 public struct TracingMiddleware<Context: RequestContext>: RouterMiddleware {
     private let headerNamesToRecord: Set<RecordingHeader>
     private let queryParametersToRedact: Set<Substring>
@@ -196,6 +197,7 @@ public protocol RemoteAddressRequestContext: RequestContext {
     var remoteAddress: SocketAddress? { get }
 }
 
+@available(iOS 16, *)
 struct RecordingHeader: Hashable {
     let name: HTTPField.Name
     let attributeName: String

Sources/Hummingbird/Router/EndpointResponder.swift

@@ -9,6 +9,7 @@
 public import HTTPTypes
 
 /// Stores endpoint responders for each HTTP method
+@available(iOS 16, *)
 @usableFromInline
 struct EndpointResponders<Context>: Sendable {
     init(path: RouterPath) {

Sources/Hummingbird/Router/RouteCollection.swift

@@ -9,6 +9,7 @@
 public import HTTPTypes
 
 /// Collection of routes
+@available(iOS 16, *)
 public final class RouteCollection<Context: RequestContext>: RouterMethods {
     /// Initialize RouteCollection
     public init(context: Context.Type = BasicRequestContext.self) {
@@ -52,6 +53,7 @@ public final class RouteCollection<Context: RequestContext>: RouterMethods {
     let middlewares: MiddlewareGroup<Context>
 }
 
+@available(iOS 16, *)
 extension RouterMethods {
     /// Add route collection to router
     /// - Parameters

Sources/Hummingbird/Router/Router+validation.swift

@@ -14,6 +14,7 @@ import FoundationEssentials
 import Foundation
 #endif
 
+@available(iOS 16, *)
 extension Router {
     /// Route description
     public struct RouteDescription: CustomStringConvertible {

Sources/Hummingbird/Router/Router.swift

@@ -36,6 +36,7 @@ public import HummingbirdCore
 /// Both of these match routes which start with "/user" and the next path segment being anything.
 /// The second version extracts the path segment out and adds it to `Request.parameters` with the
 /// key "id".
+@available(iOS 16, *)
 public final class Router<Context: RequestContext>: RouterMethods, HTTPResponderBuilder {
     var trie: RouterPathTrieBuilder<EndpointResponders<Context>>
     public let middlewares: MiddlewareGroup<Context>

Sources/Hummingbird/Router/RouterGroup.swift

@@ -23,6 +23,7 @@ public import HummingbirdCore
 /// .put(":id", use: todoController.update)
 /// .delete(":id", use: todoController.delete)
 /// ```
+@available(iOS 16, *)
 public struct RouterGroup<Context: RequestContext>: RouterMethods {
     let path: RouterPath
     let parent: any RouterMethods<Context>

Sources/Hummingbird/Router/RouterMethods.swift

@@ -34,6 +34,7 @@ public protocol RouterMethods<Context>: _HB_SendableMetatype {
     func add(middleware: any MiddlewareProtocol<Request, Response, Context>) -> Self
 }
 
+@available(iOS 16, *)
 extension RouterMethods {
     /// Add path for async closure
     @discardableResult public func on(

Sources/Hummingbird/Router/RouterResponder.swift

@@ -8,6 +8,7 @@
 
 import NIOCore
 
+@available(iOS 16, *)
 public struct RouterResponder<Context: RequestContext>: HTTPResponder {
     @usableFromInline
     let trie: RouterTrie<EndpointResponders<Context>>

Sources/Hummingbird/Server/Request.swift

@@ -58,6 +58,7 @@ extension Request {
     }
 }
 
+@available(iOS 16, *)
 extension Request {
     /// Conditional request which will only be processed if the eTag supplied is not in the
     /// `If-None-Match` request header.

Sources/Hummingbird/Server/URI+decodeQuery.swift

@@ -9,6 +9,7 @@
 public import HummingbirdCore
 import Logging
 
+@available(iOS 16, *)
 extension URI {
     /// Decode request query using ``Hummingbird/URLEncodedFormDecoder``.
     /// - Parameters

Sources/Hummingbird/Storage/MemoryPersistDriver.swift

@@ -12,6 +12,7 @@ import NIOCore
 import ServiceLifecycle
 
 /// In memory driver for persist system for storing persistent cross request key/value pairs
+@available(iOS 16, *)
 public actor MemoryPersistDriver<C: Clock>: PersistDriver where C.Duration == Duration {
     public struct Configuration: Sendable {
         /// amount of time between each call to tidy

Sources/Hummingbird/Storage/PersistDriver.swift

@@ -9,6 +9,7 @@
 public import ServiceLifecycle
 
 /// Protocol for driver supporting persistent Key/Value pairs across requests
+@available(iOS 16, *)
 public protocol PersistDriver: Service {
     /// shutdown driver
     func shutdown() async throws
@@ -40,6 +41,7 @@ public protocol PersistDriver: Service {
     func remove(key: String) async throws
 }
 
+@available(iOS 16, *)
 extension PersistDriver {
     /// default implemenation of shutdown()
     public func shutdown() async throws {}

Sources/Hummingbird/Utils/DateCache.swift

@@ -22,6 +22,7 @@ import Foundation
 ///
 /// Getting the current date formatted is an expensive operation. This creates a task that will
 /// update a cached version of the date in the format as detailed in RFC9110 once every second.
+@available(iOS 16, *)
 final class DateCache: Service {
     final class DateContainer: AtomicReference, Sendable {
         let date: String

Sources/Hummingbird/Utils/HTTPHeaderDateFormatStyle.swift

@@ -18,6 +18,7 @@ import FoundationEssentials
 import Foundation
 #endif
 
+@available(iOS 16, *)
 extension Date {
     init?(httpHeader: String) {
         try? self.init(httpHeader, strategy: .rfc9110)
@@ -30,6 +31,7 @@ extension Date {
 
 struct HTTPHeaderDateParsingError: Error {}
 
+@available(iOS 16, *)
 struct HTTPHeaderDateFormatStyle {
     let calendar: Calendar
 
@@ -40,6 +42,7 @@ struct HTTPHeaderDateFormatStyle {
     }
 }
 
+@available(iOS 16, *)
 extension HTTPHeaderDateFormatStyle: ParseStrategy {
     func parse(_ input: String) throws -> Date {
         guard let components = self.components(from: input) else {
@@ -275,6 +278,7 @@ let timezoneOffsetMap: [[UInt8]: Int] = [
     Array("PDT".utf8): -7 * 60,
 ]
 
+@available(iOS 16, *)
 extension HTTPHeaderDateFormatStyle: FormatStyle {
     //let calendar: Calendar
 
@@ -319,10 +323,12 @@ extension HTTPHeaderDateFormatStyle: FormatStyle {
     ]
 }
 
+@available(iOS 16, *)
 extension FormatStyle where Self == HTTPHeaderDateFormatStyle {
     static var rfc9110: Self { .init() }
 }
 
+@available(iOS 16, *)
 extension ParseStrategy where Self == HTTPHeaderDateFormatStyle {
     static var rfc9110: Self { .init() }
 }

Sources/HummingbirdCore/Server/HTTP/HTTPServerBuilder.swift

@@ -32,6 +32,7 @@ public struct HTTPServerBuilder: Sendable {
     ///   - responder: HTTP responder
     ///   - onServerRunning: Closure to run once server is up and running
     /// - Returns: Server Service
+    @available(iOS 17, *)
     public func buildServer(
         configuration: ServerConfiguration,
         eventLoopGroup: any EventLoopGroup,