added logic to detect custom http client

Author: kai-ion

tests/aws-cpp-sdk-core-tests/utils/stream/ChunkingInterceptorTest.cpp

@@ -21,7 +21,8 @@ class ChunkingInterceptorTest : public Aws::Testing::AwsCppSdkGTestSuite {
         StandardHttpRequest request{"test.com", Http::HttpMethod::HTTP_GET};
         auto requestHash = Aws::MakeShared<CRC32>(CHUNKING_TEST_LOG_TAG);
         request.SetRequestHash("crc32", requestHash);
-        auto inputStream = Aws::MakeShared<Aws::StringStream>(CHUNKING_TEST_LOG_TAG, input);
+        auto inputStream = Aws::MakeShared<Aws::StringStream>(CHUNKING_TEST_LOG_TAG);
+        *inputStream << input;
 
         AwsChunkedIOStream wrapper{&request, inputStream, bufferSize};
         Aws::IOStream* stream = &wrapper;