diff --git a/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapper.java b/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapper.java
index 9ea787b..ba42295 100644
--- a/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapper.java
+++ b/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapper.java
@@ -1,6 +1,5 @@
 package ee.bitweb.core.retrofit.logging.mappers;
 
-import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import okhttp3.*;
 
@@ -8,17 +7,21 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import static ee.bitweb.core.retrofit.logging.mappers.RetrofitHeadersMapperHelper.*;
 
 @Slf4j
-@RequiredArgsConstructor
 public class RetrofitRequestHeadersMapper implements RetrofitLoggingMapper {
 
     public static final String KEY = "request_headers";
 
     private final Set<String> redactHeaders;
 
+    public RetrofitRequestHeadersMapper(Set<String> redactHeaders) {
+        this.redactHeaders = redactHeaders.stream().map(String::toLowerCase).collect(Collectors.toSet());
+    }
+
     @Override
     public String getValue(Request request, Response response) {
         try {
diff --git a/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapper.java b/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapper.java
index 86caecb..0ed2fce 100644
--- a/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapper.java
+++ b/src/main/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapper.java
@@ -1,22 +1,25 @@
 package ee.bitweb.core.retrofit.logging.mappers;
 
-import lombok.RequiredArgsConstructor;
 import okhttp3.*;
 
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import static ee.bitweb.core.retrofit.logging.mappers.RetrofitHeadersMapperHelper.CONTENT_LENGTH;
 import static ee.bitweb.core.retrofit.logging.mappers.RetrofitHeadersMapperHelper.CONTENT_TYPE;
 
-@RequiredArgsConstructor
 public class RetrofitResponseHeadersMapper implements RetrofitLoggingMapper {
 
     public static final String KEY = "response_headers";
 
     private final Set<String> redactHeaders;
 
+    public RetrofitResponseHeadersMapper(Set<String> redactHeaders) {
+        this.redactHeaders = redactHeaders.stream().map(String::toLowerCase).collect(Collectors.toSet());
+    }
+
     @Override
     public String getValue(Request request, Response response) {
         return getResponseHeadersString(response);
diff --git a/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapperTest.java b/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapperTest.java
new file mode 100644
index 0000000..1986024
--- /dev/null
+++ b/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitRequestHeadersMapperTest.java
@@ -0,0 +1,62 @@
+package ee.bitweb.core.retrofit.logging.mappers;
+
+import okhttp3.Headers;
+import okhttp3.Request;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@Tag("unit")
+@ExtendWith(MockitoExtension.class)
+class RetrofitRequestHeadersMapperTest {
+
+    @Mock
+    Request request;
+
+    @Test
+    @DisplayName("All headers are logged")
+    void headersAreLogged() {
+        Mockito.when(request.headers()).thenReturn(createHeaders());
+        Mockito.when(request.body()).thenReturn(null);
+
+        var mapper = new RetrofitRequestHeadersMapper(Set.of());
+
+        assertEquals("X-Custom-Id: aBc134; Content-Length: 123; Content-Type: application/json", mapper.getValue(request, null));
+
+        Mockito.verify(request, Mockito.times(1)).body();
+        Mockito.verify(request, Mockito.times(1)).headers();
+        Mockito.verifyNoMoreInteractions(request);
+    }
+
+    @Test
+    @DisplayName("Suppressed headers list is honoured")
+    void suppressedListIsHonoured() {
+        Mockito.when(request.headers()).thenReturn(createHeaders());
+        Mockito.when(request.body()).thenReturn(null);
+
+        var mapper = new RetrofitRequestHeadersMapper(Set.of("X-Custom-Id"));
+
+        assertEquals("X-Custom-Id:  ; Content-Length: 123; Content-Type: application/json", mapper.getValue(request, null));
+
+        Mockito.verify(request, Mockito.times(1)).body();
+        Mockito.verify(request, Mockito.times(1)).headers();
+        Mockito.verifyNoMoreInteractions(request);
+    }
+
+    private Headers createHeaders() {
+        Headers.Builder headersBuilder = new Headers.Builder();
+        headersBuilder.add("Content-Type", "application/json");
+        headersBuilder.add("Content-Length", "123");
+        headersBuilder.add("X-Custom-Id", "aBc134");
+
+        return headersBuilder.build();
+    }
+}
diff --git a/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapperTest.java b/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapperTest.java
new file mode 100644
index 0000000..49b96e3
--- /dev/null
+++ b/src/test/java/ee/bitweb/core/retrofit/logging/mappers/RetrofitResponseHeadersMapperTest.java
@@ -0,0 +1,62 @@
+package ee.bitweb.core.retrofit.logging.mappers;
+
+import okhttp3.Headers;
+import okhttp3.Response;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@Tag("unit")
+@ExtendWith(MockitoExtension.class)
+class RetrofitResponseHeadersMapperTest {
+
+    @Mock
+    Response response;
+
+    @Test
+    @DisplayName("All headers are logged")
+    void headersAreLogged() {
+        Mockito.when(response.headers()).thenReturn(createHeaders());
+        Mockito.when(response.body()).thenReturn(null);
+
+        var mapper = new RetrofitResponseHeadersMapper(Set.of());
+
+        assertEquals("X-Custom-Id: aBc134; Content-Length: 123; Content-Type: application/json", mapper.getValue(null, response));
+
+        Mockito.verify(response, Mockito.times(1)).body();
+        Mockito.verify(response, Mockito.times(1)).headers();
+        Mockito.verifyNoMoreInteractions(response);
+    }
+
+    @Test
+    @DisplayName("Suppressed headers list is honoured")
+    void suppressedListIsHonoured() {
+        Mockito.when(response.headers()).thenReturn(createHeaders());
+        Mockito.when(response.body()).thenReturn(null);
+
+        var mapper = new RetrofitResponseHeadersMapper(Set.of("X-Custom-Id"));
+
+        assertEquals("X-Custom-Id:  ; Content-Length: 123; Content-Type: application/json", mapper.getValue(null, response));
+
+        Mockito.verify(response, Mockito.times(1)).body();
+        Mockito.verify(response, Mockito.times(1)).headers();
+        Mockito.verifyNoMoreInteractions(response);
+    }
+
+    private Headers createHeaders() {
+        Headers.Builder headersBuilder = new Headers.Builder();
+        headersBuilder.add("Content-Type", "application/json");
+        headersBuilder.add("Content-Length", "123");
+        headersBuilder.add("X-Custom-Id", "aBc134");
+
+        return headersBuilder.build();
+    }
+}