chore(auth): update AppSyncSigner (#4063)

* chore: update AppSyncSigner

* chore: fix tests

Author: thisisabhash

AmplifyPlugins/Auth/Sources/AWSCognitoAuthPlugin/AWSCognitoAuthPlugin+AppSyncSigner.swift

@@ -31,8 +31,7 @@ extension AWSCognitoAuthPlugin {
         return { request in
             try await signAppSyncRequest(
                 request,
-
-                                         region: region
+                region: region
             )
         }
     }
@@ -113,8 +112,6 @@ extension AWSCognitoAuthPlugin {
         }
 
         var headers = urlRequest.allHTTPHeaderFields ?? [:]
-        headers.updateValue(host, forKey: "host")
-
         let httpMethod = (urlRequest.httpMethod?.uppercased())
             .flatMap(HTTPMethodType.init(rawValue:)) ?? .get
 

AmplifyPlugins/Auth/Tests/AWSCognitoAuthPluginUnitTests/AWSCognitoAuthPluginAppSyncSignerTests.swift

@@ -30,7 +30,6 @@ class AWSCognitoAuthPluginAppSyncSignerTests: XCTestCase {
         XCTAssertEqual(request.method, .post)
         XCTAssertEqual(request.endpoint.port, 443)
         XCTAssertEqual(request.endpoint.protocolType, .https)
-        XCTAssertEqual(request.endpoint.headers.headers, [.init(name: "host", value: "graphql.com")])
         guard case let .data(data) = request.body else {
             XCTFail("Unexpected body")
             return

AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/AppSyncSignerTests/AppSyncSignerTests.swift

@@ -27,9 +27,9 @@ class AppSyncSignerTests: AWSAuthBaseTest {
             XCTFail("Missing headers")
             return
         }
-        XCTAssertEqual(headers.count, 4)
+        XCTAssertEqual(headers.count, 3)
         let containsExpectedHeaders = headers.keys.contains(where: { key in
-            key == "Authorization" || key == "Host" || key == "X-Amz-Security-Token" || key == "X-Amz-Date"
+            key == "Authorization" || key == "X-Amz-Security-Token" || key == "X-Amz-Date"
         })
         XCTAssertTrue(containsExpectedHeaders)
     }