diff --git a/Sources/Modules/Core/HTTPRequest.swift b/Sources/Modules/Core/HTTPRequest.swift
index c2fd27d..6fade7e 100644
--- a/Sources/Modules/Core/HTTPRequest.swift
+++ b/Sources/Modules/Core/HTTPRequest.swift
@@ -30,6 +30,7 @@ public struct HTTPRequest: Sendable {
     ///   - method: The HTTP method.
     ///   - scheme: URL scheme (e.g. "https").
     ///   - host: The host (e.g. "api.example.com").
+    ///   - port: The port of the server, if any (e.g. `8080`).
     ///   - path: The URL path (e.g. "/v1/resource").
     ///   - headers: Initial headers.
     ///   - body: The request body.
@@ -37,6 +38,7 @@ public struct HTTPRequest: Sendable {
         method: Method,
         scheme: String = "https",
         host: String? = nil,
+        port: Int? = nil,
         path: String,
         headers: [String: String] = [:],
         body: HTTPBody = EmptyBody()
@@ -47,6 +49,7 @@ public struct HTTPRequest: Sendable {
         
         urlComponents.scheme = scheme
         urlComponents.host = host
+        urlComponents.port = port
         urlComponents.path = path
     }
     
@@ -93,6 +96,18 @@ extension HTTPRequest {
         set { urlComponents.host = newValue }
     }
     
+    /// The URL scheme for this request.
+    public var scheme: String? {
+        get { urlComponents.scheme }
+        set { urlComponents.scheme = newValue }
+    }
+    
+    /// The port component of the URL.
+    public var port: Int? {
+        get { urlComponents.port }
+        set { urlComponents.port = newValue }
+    }
+    
     /// The path component of the URL.
     public var path: String {
         get { urlComponents.path }
diff --git a/Sources/Modules/Sauce/Handlers/ServerEnvironmentHandler.swift b/Sources/Modules/Sauce/Handlers/ServerEnvironmentHandler.swift
index a5d7638..222d29c 100644
--- a/Sources/Modules/Sauce/Handlers/ServerEnvironmentHandler.swift
+++ b/Sources/Modules/Sauce/Handlers/ServerEnvironmentHandler.swift
@@ -37,6 +37,14 @@ public struct ServerEnvironmentHandler: HTTPHandler {
             requestCopy.host = environment.host
         }
         
+        if requestCopy.port == nil {
+            requestCopy.port = environment.port
+        }
+        
+        if let customScheme = environment.scheme {
+            requestCopy.scheme = customScheme
+        }
+        
         if requestCopy.path.hasPrefix("/") == false {
             let pathSeparator = environment.pathPrefix.hasSuffix("/") ? "" : "/"
             requestCopy.path = environment.pathPrefix + pathSeparator + requestCopy.path
diff --git a/Sources/Modules/Sauce/Options/ServerEnvironment.swift b/Sources/Modules/Sauce/Options/ServerEnvironment.swift
index aedbd42..24fa880 100644
--- a/Sources/Modules/Sauce/Options/ServerEnvironment.swift
+++ b/Sources/Modules/Sauce/Options/ServerEnvironment.swift
@@ -18,22 +18,35 @@ public struct ServerEnvironment: Sendable {
     
     /// Default headers to include on every request.
     public var headers: [String: String]
+    
+    /// Optional URL scheme to override on requests.
+    public var scheme: String?
+    
+    /// Optional port to use for the server.
+    public var port: Int?
+    
 
     /// Initializes a new environment.
     ///
     /// - Parameters:
     ///   - host: The server host.
     ///   - pathPrefix: A path segment to prepend.
+    ///   - scheme: The URL scheme to override, if any.
+    ///   - port: The port to use for the server, if any.
     ///   - headers: Default headers.
     public init(
         host: String,
         pathPrefix: String = "/",
+        scheme: String? = nil,
+        port: Int? = nil,
         headers: [String: String] = [:]
     ) {
         let prefix = pathPrefix.hasPrefix("/") ? "" : "/"
 
         self.host = host
         self.pathPrefix = prefix + pathPrefix
+        self.scheme = scheme
+        self.port = port
         self.headers = headers
     }
 }
diff --git a/Tests/SimpleHTTPTests/Sauce/Handlers/ServerEnvironmentHandlerTests.swift b/Tests/SimpleHTTPTests/Sauce/Handlers/ServerEnvironmentHandlerTests.swift
index f804ed9..423600c 100644
--- a/Tests/SimpleHTTPTests/Sauce/Handlers/ServerEnvironmentHandlerTests.swift
+++ b/Tests/SimpleHTTPTests/Sauce/Handlers/ServerEnvironmentHandlerTests.swift
@@ -42,4 +42,41 @@ struct ServerEnvironmentHandlerTests {
         let url = try #require(sentRequest.url)
         #expect(url.absoluteString == "https://api.example.com/v1/users")
     }
+    
+    @Test("Injects localhost environment")
+    func testLocalhostEnvironmentInjection() async throws {
+        let environment = ServerEnvironment(
+            host: "localhost",
+            pathPrefix: "/v1",
+            scheme: "http",
+            port: 8080,
+            headers: ["Accept": "application/json"]
+        )
+        
+        let responseHandler = MockHTTPHandler { request in
+            .mock(request: request)
+        }
+
+        let environmentHandler = ServerEnvironmentHandler(
+            environment: environment,
+            nextHandler: responseHandler
+        )
+
+        let request = HTTPRequest(
+            method: .get,
+            path: "users"
+        )
+        
+        let result = try await environmentHandler.handle(request: request)
+        let sentRequest = result.request
+
+        #expect(sentRequest.host == environment.host)
+        #expect(sentRequest.path == "/v1/users")
+        #expect(sentRequest.headers["Accept"] == "application/json")
+        #expect(sentRequest.port == environment.port)
+        #expect(sentRequest.scheme == environment.scheme)
+        
+        let url = try #require(sentRequest.url)
+        #expect(url.absoluteString == "http://localhost:8080/v1/users")
+    }
 }