diff --git a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/AuthTokenURLRequestInterceptor.swift b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/AuthTokenURLRequestInterceptor.swift
index 0175364b7a..9d2589d3bc 100644
--- a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/AuthTokenURLRequestInterceptor.swift
+++ b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/AuthTokenURLRequestInterceptor.swift
@@ -32,8 +32,6 @@ struct AuthTokenURLRequestInterceptor: URLRequestInterceptor {
 
         mutableRequest.setValue(amzDate,
                                 forHTTPHeaderField: URLRequestConstants.Header.xAmzDate)
-        mutableRequest.setValue(URLRequestConstants.ContentType.applicationJson,
-                                forHTTPHeaderField: URLRequestConstants.Header.contentType)
         mutableRequest.setValue(userAgent,
                                 forHTTPHeaderField: URLRequestConstants.Header.userAgent)
         
diff --git a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/IAMURLRequestInterceptor.swift b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/IAMURLRequestInterceptor.swift
index 013cac0459..0a9b53fe93 100644
--- a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/IAMURLRequestInterceptor.swift
+++ b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Interceptor/RequestInterceptor/IAMURLRequestInterceptor.swift
@@ -36,7 +36,6 @@ struct IAMURLRequestInterceptor: URLRequestInterceptor {
             throw APIError.unknown("Could not get host from mutable request", "")
         }
 
-        request.setValue(URLRequestConstants.ContentType.applicationJson, forHTTPHeaderField: URLRequestConstants.Header.contentType)
         request.setValue(host, forHTTPHeaderField: "host")
         request.setValue(userAgent, forHTTPHeaderField: URLRequestConstants.Header.userAgent)
 
diff --git a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Operation/AWSRESTOperation.swift b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Operation/AWSRESTOperation.swift
index ca2324f4a5..1c8efc986d 100644
--- a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Operation/AWSRESTOperation.swift
+++ b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Operation/AWSRESTOperation.swift
@@ -116,9 +116,6 @@ final public class AWSRESTOperation: AmplifyOperation<
                 }
             }
 
-            // The headers from the request object should override any of the same header modifications done by the intercepters above
-            finalRequest = RESTOperationRequestUtils.applyCustomizeRequestHeaders(request.headers, on: finalRequest)
-
             if isCancelled {
                 finish()
                 return
diff --git a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Support/Utils/RESTOperationRequestUtils.swift b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Support/Utils/RESTOperationRequestUtils.swift
index a553dcef71..8a9716def3 100644
--- a/AmplifyPlugins/API/Sources/AWSAPIPlugin/Support/Utils/RESTOperationRequestUtils.swift
+++ b/AmplifyPlugins/API/Sources/AWSAPIPlugin/Support/Utils/RESTOperationRequestUtils.swift
@@ -57,31 +57,19 @@ final class RESTOperationRequestUtils {
                                     headers: [String: String]?,
                                     requestPayload: Data?) -> URLRequest {
 
-        let baseHeaders = ["content-type": "application/json"]
         var baseRequest = URLRequest(url: url)
-        baseRequest = applyCustomizeRequestHeaders(
-            baseHeaders.merging(headers ?? [:], uniquingKeysWith: { _, new in new }),
-            on: baseRequest
-        )
+        var requestHeaders = ["content-type": "application/json"]
+        if let headers = headers {
+            for (key, value) in headers {
+                requestHeaders[key.lowercased()] = value
+            }
+        }
+        baseRequest.allHTTPHeaderFields = requestHeaders
         baseRequest.httpMethod = operationType.rawValue
         baseRequest.httpBody = requestPayload
         return baseRequest
     }
 
-    static func applyCustomizeRequestHeaders(_ headers: [String: String]?, on request: URLRequest) -> URLRequest {
-        guard let headers = headers,
-              let mutableRequest = (request as NSURLRequest).mutableCopy() as? NSMutableURLRequest
-        else {
-            return request
-        }
-
-        for (key, value) in headers {
-            mutableRequest.setValue(value, forHTTPHeaderField: key)
-        }
-
-        return mutableRequest as URLRequest
-    }
-
     private static let permittedQueryParamCharacters = CharacterSet.alphanumerics
         .union(.init(charactersIn: "/_-.~"))
 
diff --git a/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Interceptor/AuthTokenURLRequestInterceptorTests.swift b/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Interceptor/AuthTokenURLRequestInterceptorTests.swift
index ed1df2905b..a0ef11879a 100644
--- a/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Interceptor/AuthTokenURLRequestInterceptorTests.swift
+++ b/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Interceptor/AuthTokenURLRequestInterceptorTests.swift
@@ -15,7 +15,12 @@ class AuthTokenURLRequestInterceptorTests: XCTestCase {
     func testAuthTokenInterceptor() async throws {
         let mockTokenProvider = MockTokenProvider()
         let interceptor = AuthTokenURLRequestInterceptor(authTokenProvider: mockTokenProvider)
-        let request = URLRequest(url: URL(string: "http://anapiendpoint.ca")!)
+        let request = RESTOperationRequestUtils.constructURLRequest(
+            with: URL(string: "http://anapiendpoint.ca")!,
+            operationType: .get,
+            headers: nil,
+            requestPayload: nil
+        )
 
         guard let headers = try await interceptor.intercept(request).allHTTPHeaderFields else {
             XCTFail("Failed retrieving headers")
diff --git a/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Support/Utils/RESTRequestUtilsTests.swift b/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Support/Utils/RESTRequestUtilsTests.swift
index 4de8148fcc..8e1e5ec1ef 100644
--- a/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Support/Utils/RESTRequestUtilsTests.swift
+++ b/AmplifyPlugins/API/Tests/AWSAPIPluginTests/Support/Utils/RESTRequestUtilsTests.swift
@@ -95,18 +95,6 @@ class RESTRequestUtilsTests: XCTestCase {
             )
         )
     }
-
-    func testApplyCustomizeRequestHeaders_withCutomeHeaders_successfullyOverride() {
-        var request = URLRequest(url: URL(string: "https://aws.amazon.com")!)
-        request.allHTTPHeaderFields = ["Content-Type": "application/json"]
-        let headers = ["Content-Type": "text/plain"]
-        let requestWithHeaders = RESTOperationRequestUtils.applyCustomizeRequestHeaders(headers, on: request)
-        XCTAssertNotNil(requestWithHeaders.allHTTPHeaderFields)
-        for (key, value) in headers {
-            XCTAssertEqual(requestWithHeaders.allHTTPHeaderFields![key], value)
-        }
-    }
-
 }
 
 extension RESTRequestUtilsTests {