Fixed warnings when -require-explicit-sendable is enabled

.gitignore

@@ -8,3 +8,5 @@ DerivedData/
 .netrc
 Package.resolved
 .swiftpm/xcode/
+.vscode
+.swift-version

Package.swift

@@ -5,6 +5,7 @@ import PackageDescription
 let extraSettings: [SwiftSetting] = [
     .enableExperimentalFeature("SuppressedAssociatedTypes"),
     .enableExperimentalFeature("LifetimeDependence"),
+    .enableExperimentalFeature("NonescapableTypes"),
     .enableUpcomingFeature("LifetimeDependence"),
     .enableUpcomingFeature("NonisolatedNonsendingByDefault"),
     .enableUpcomingFeature("InferIsolatedConformances"),

Sources/HTTPServer/HTTPRequestConcludingAsyncReader.swift

@@ -115,3 +115,9 @@ public struct HTTPRequestConcludingAsyncReader: ConcludingAsyncReader {
         return (result, partsReader.trailers)
     }
 }
+
+@available(*, unavailable)
+extension HTTPRequestConcludingAsyncReader: Sendable { }
+
+@available(*, unavailable)
+extension HTTPRequestConcludingAsyncReader.RequestBodyAsyncReader: Sendable { }

Sources/HTTPServer/HTTPResponseConcludingAsyncWriter.swift

@@ -100,3 +100,9 @@ public struct HTTPResponseConcludingAsyncWriter: ConcludingAsyncWriter, ~Copyabl
         return result
     }
 }
+
+@available(*, unavailable)
+extension HTTPResponseConcludingAsyncWriter: Sendable { }
+
+@available(*, unavailable)
+extension HTTPResponseConcludingAsyncWriter.ResponseBodyAsyncWriter: Sendable { }

Sources/HTTPServer/HTTPServer.swift

@@ -60,7 +60,7 @@ import SwiftASN1
 /// }
 /// ```
 @available(macOS 26.0, iOS 26.0, watchOS 26.0, tvOS 26.0, visionOS 26.0, *)
-public final class Server<RequestHandler: HTTPServerRequestHandler> {
+public final class Server<RequestHandler: HTTPServerRequestHandler>: Sendable {
     /// Starts an HTTP server with a closure-based request handler.
     ///
     /// This method provides a convenient way to start an HTTP server using a closure to handle incoming requests.

Sources/HTTPServer/HTTPServerClosureRequestHandler.swift

@@ -24,7 +24,7 @@ public import HTTPTypes
 /// }
 /// ```
 @available(macOS 26.0, iOS 26.0, watchOS 26.0, tvOS 26.0, visionOS 26.0, *)
-public struct HTTPServerClosureRequestHandler: HTTPServerRequestHandler {
+public struct HTTPServerClosureRequestHandler: HTTPServerRequestHandler, Sendable {
     /// The underlying closure that handles HTTP requests
     private let _handler:
         @Sendable (

Sources/Middleware/MiddlewareBuilder.swift

@@ -21,7 +21,7 @@
 /// }
 /// ```
 @resultBuilder
-public struct MiddlewareChainBuilder {
+public struct MiddlewareChainBuilder: Sendable {
     /// Builds a middleware chain from a single middleware component.
     ///
     /// This is the base case for the result builder pattern, handling a single middleware.

Sources/Middleware/MiddlewareChain.swift

@@ -56,3 +56,6 @@ public struct MiddlewareChain<Input, NextInput>: Middleware {
         try await middlewareFunc(input, next)
     }
 }
+
+@available(*, unavailable)
+extension MiddlewareChain: Sendable  { }