Revert Deployment Target Changes (#3720)

### Issue Link :link:
#3719

### Goals :soccer:
Unfortunately the deployment changes were more breaking than expected so
this PR reverts them. Anyone having issues with libarclite should
manually set their deployment target using a `post_install` hook, but
that issue is much less common than this deployment target issue.

Alamofire.podspec

@@ -8,10 +8,10 @@ Pod::Spec.new do |s|
   s.source = { :git => 'https://github.com/Alamofire/Alamofire.git', :tag => s.version }
   s.documentation_url = 'https://alamofire.github.io/Alamofire/'
 
-  s.ios.deployment_target = '11.0'
-  s.osx.deployment_target = '10.13'
-  s.tvos.deployment_target = '11.0'
-  s.watchos.deployment_target = '4.0'
+  s.ios.deployment_target = '10.0'
+  s.osx.deployment_target = '10.12'
+  s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '3.0'
 
   s.swift_versions = ['5']
 

Alamofire.xcodeproj/project.pbxproj

@@ -2090,8 +2090,8 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Source/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MARKETING_VERSION = 5.7.0;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_LDFLAGS = (
@@ -2103,9 +2103,9 @@
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
 				SWIFT_VERSION = 5.0;
-				TVOS_DEPLOYMENT_TARGET = 11.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VERSIONING_SYSTEM = "apple-generic";
-				WATCHOS_DEPLOYMENT_TARGET = 4.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Debug;
 		};
@@ -2156,8 +2156,8 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Source/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MARKETING_VERSION = 5.7.0;
 				OTHER_LDFLAGS = (
 					"-framework",
@@ -2169,10 +2169,10 @@
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
 				SWIFT_VERSION = 5.0;
-				TVOS_DEPLOYMENT_TARGET = 11.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
-				WATCHOS_DEPLOYMENT_TARGET = 4.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Release;
 		};

Example/iOS Example.xcodeproj/project.pbxproj

@@ -409,16 +409,16 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 11.0;
-				WATCHOS_DEPLOYMENT_TARGET = 4.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Debug;
 		};
@@ -462,16 +462,16 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 11.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VALIDATE_PRODUCT = YES;
-				WATCHOS_DEPLOYMENT_TARGET = 4.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Release;
 		};

Package@swift-5.5.swift

@@ -26,10 +26,10 @@
 import PackageDescription
 
 let package = Package(name: "Alamofire",
-                      platforms: [.macOS(.v10_13),
-                                  .iOS(.v11),
-                                  .tvOS(.v11),
-                                  .watchOS(.v4)],
+                      platforms: [.macOS(.v10_12),
+                                  .iOS(.v10),
+                                  .tvOS(.v10),
+                                  .watchOS(.v3)],
                       products: [.library(name: "Alamofire",
                                           targets: ["Alamofire"])],
                       targets: [.target(name: "Alamofire",

Package@swift-5.6.swift

@@ -26,10 +26,10 @@
 import PackageDescription
 
 let package = Package(name: "Alamofire",
-                      platforms: [.macOS(.v10_13),
-                                  .iOS(.v11),
-                                  .tvOS(.v11),
-                                  .watchOS(.v4)],
+                      platforms: [.macOS(.v10_12),
+                                  .iOS(.v10),
+                                  .tvOS(.v10),
+                                  .watchOS(.v3)],
                       products: [.library(name: "Alamofire",
                                           targets: ["Alamofire"])],
                       targets: [.target(name: "Alamofire",

README.md

@@ -63,7 +63,7 @@ In order to keep Alamofire focused specifically on core networking implementatio
 
 | Platform | Minimum Swift Version | Installation | Status |
 | --- | --- | --- | --- |
-| iOS 11.0+ / macOS 10.13+ / tvOS 11.0+ / watchOS 4.0+ | 5.5 | [CocoaPods](#cocoapods), [Carthage](#carthage), [Swift Package Manager](#swift-package-manager), [Manual](#manually) | Fully Tested |
+| iOS 10.0+ / macOS 10.12+ / tvOS 10.0+ / watchOS 3.0+ | 5.5 | [CocoaPods](#cocoapods), [Carthage](#carthage), [Swift Package Manager](#swift-package-manager), [Manual](#manually) | Fully Tested |
 | Linux | Latest Only | [Swift Package Manager](#swift-package-manager) | Building But Unsupported |
 | Windows | Latest Only | [Swift Package Manager](#swift-package-manager) | Building But Unsupported |
 

Source/EventMonitor.swift

@@ -375,6 +375,7 @@ public final class CompositeEventMonitor: EventMonitor {
         performEvent { $0.urlSession(session, task: task, didCompleteWithError: error) }
     }
 
+    @available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
     public func urlSession(_ session: URLSession, taskIsWaitingForConnectivity task: URLSessionTask) {
         performEvent { $0.urlSession(session, taskIsWaitingForConnectivity: task) }
     }
@@ -735,6 +736,7 @@ open class ClosureEventMonitor: EventMonitor {
         taskDidComplete?(session, task, error)
     }
 
+    @available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
     open func urlSession(_ session: URLSession, taskIsWaitingForConnectivity task: URLSessionTask) {
         taskIsWaitingForConnectivity?(session, task)
     }

Source/HTTPHeaders.swift

@@ -355,7 +355,14 @@ extension HTTPHeader {
     ///
     /// See the [Accept-Encoding HTTP header documentation](https://tools.ietf.org/html/rfc7230#section-4.2.3) .
     public static let defaultAcceptEncoding: HTTPHeader = {
-        .acceptEncoding(["br", "gzip", "deflate"].qualityEncoded())
+        let encodings: [String]
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, watchOS 4.0, *) {
+            encodings = ["br", "gzip", "deflate"]
+        } else {
+            encodings = ["gzip", "deflate"]
+        }
+
+        return .acceptEncoding(encodings.qualityEncoded())
     }()
 
     /// Returns Alamofire's default `Accept-Language` header, generated by querying `Locale` for the user's

Source/ParameterEncoder.swift

@@ -54,6 +54,7 @@ open class JSONParameterEncoder: ParameterEncoder {
     }
 
     /// Returns an encoder with `JSONEncoder.outputFormatting` set to `.sortedKeys`.
+    @available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
     public static var sortedKeys: JSONParameterEncoder {
         let encoder = JSONEncoder()
         encoder.outputFormatting = .sortedKeys

Source/SessionDelegate.swift

@@ -221,6 +221,7 @@ extension SessionDelegate: URLSessionTaskDelegate {
         }
     }
 
+    @available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
     open func urlSession(_ session: URLSession, taskIsWaitingForConnectivity task: URLSessionTask) {
         eventMonitor?.urlSession(session, taskIsWaitingForConnectivity: task)
     }

Tests/ParameterEncoderTests.swift

@@ -107,6 +107,7 @@ final class JSONParameterEncoderTests: BaseTestCase {
 
 final class SortedKeysJSONParameterEncoderTests: BaseTestCase {
     func testTestJSONEncoderSortedKeysHasSortedKeys() throws {
+        guard #available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *) else { return }
         // Given
         let encoder = JSONParameterEncoder.sortedKeys
         let request = Endpoint().urlRequest

Tests/SessionTests.swift

@@ -359,7 +359,12 @@ final class SessionTestCase: BaseTestCase {
         waitForExpectations(timeout: timeout)
 
         // Then
-        XCTAssertTrue(brotliResponse?.result.isSuccess == true)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, watchOS 4.0, *) {
+            XCTAssertTrue(brotliResponse?.result.isSuccess == true)
+        } else {
+            XCTAssertTrue(brotliResponse?.result.isFailure == true)
+        }
+
         XCTAssertTrue(gzipResponse?.result.isSuccess == true)
         XCTAssertTrue(deflateResponse?.result.isSuccess == true)
     }