diff --git a/Libraries/LibHTTP/HttpResponse.cpp b/Libraries/LibHTTP/HttpResponse.cpp
index dc8f6468f4..db5711ff5c 100644
--- a/Libraries/LibHTTP/HttpResponse.cpp
+++ b/Libraries/LibHTTP/HttpResponse.cpp
@@ -28,7 +28,7 @@
 
 namespace HTTP {
 
-HttpResponse::HttpResponse(int code, HashMap<String, String>&& headers, ByteBuffer&& payload)
+HttpResponse::HttpResponse(int code, HashMap<String, String, CaseInsensitiveStringTraits>&& headers, ByteBuffer&& payload)
     : Core::NetworkResponse(move(payload))
     , m_code(code)
     , m_headers(move(headers))
diff --git a/Libraries/LibHTTP/HttpResponse.h b/Libraries/LibHTTP/HttpResponse.h
index 4f86cbe9e9..f36b98bd13 100644
--- a/Libraries/LibHTTP/HttpResponse.h
+++ b/Libraries/LibHTTP/HttpResponse.h
@@ -35,19 +35,19 @@ namespace HTTP {
 class HttpResponse : public Core::NetworkResponse {
 public:
     virtual ~HttpResponse() override;
-    static NonnullRefPtr<HttpResponse> create(int code, HashMap<String, String>&& headers, ByteBuffer&& payload)
+    static NonnullRefPtr<HttpResponse> create(int code, HashMap<String, String, CaseInsensitiveStringTraits>&& headers, ByteBuffer&& payload)
     {
         return adopt(*new HttpResponse(code, move(headers), move(payload)));
     }
 
     int code() const { return m_code; }
-    const HashMap<String, String>& headers() const { return m_headers; }
+    const HashMap<String, String, CaseInsensitiveStringTraits>& headers() const { return m_headers; }
 
 private:
-    HttpResponse(int code, HashMap<String, String>&&, ByteBuffer&&);
+    HttpResponse(int code, HashMap<String, String, CaseInsensitiveStringTraits>&&, ByteBuffer&&);
 
     int m_code { 0 };
-    HashMap<String, String> m_headers;
+    HashMap<String, String, CaseInsensitiveStringTraits> m_headers;
 };
 
 }
diff --git a/Libraries/LibHTTP/Job.h b/Libraries/LibHTTP/Job.h
index c441660635..9631dde4ae 100644
--- a/Libraries/LibHTTP/Job.h
+++ b/Libraries/LibHTTP/Job.h
@@ -73,7 +73,7 @@ protected:
     HttpRequest m_request;
     State m_state { State::InStatus };
     int m_code { -1 };
-    HashMap<String, String> m_headers;
+    HashMap<String, String, CaseInsensitiveStringTraits> m_headers;
     Vector<ByteBuffer> m_received_buffers;
     size_t m_received_size { 0 };
     bool m_sent_data { 0 };
diff --git a/Services/ProtocolServer/Download.cpp b/Services/ProtocolServer/Download.cpp
index e4bbce082b..e205d38a55 100644
--- a/Services/ProtocolServer/Download.cpp
+++ b/Services/ProtocolServer/Download.cpp
@@ -64,7 +64,7 @@ void Download::set_payload(const ByteBuffer& payload)
     m_total_size = payload.size();
 }
 
-void Download::set_response_headers(const HashMap<String, String>& response_headers)
+void Download::set_response_headers(const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers)
 {
     m_response_headers = response_headers;
 }
diff --git a/Services/ProtocolServer/Download.h b/Services/ProtocolServer/Download.h
index 5609cd15b4..0796765482 100644
--- a/Services/ProtocolServer/Download.h
+++ b/Services/ProtocolServer/Download.h
@@ -47,7 +47,7 @@ public:
     Optional<u32> total_size() const { return m_total_size; }
     size_t downloaded_size() const { return m_downloaded_size; }
     const ByteBuffer& payload() const { return m_payload; }
-    const HashMap<String, String>& response_headers() const { return m_response_headers; }
+    const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers() const { return m_response_headers; }
 
     void stop();
 
@@ -57,7 +57,7 @@ protected:
     void did_finish(bool success);
     void did_progress(Optional<u32> total_size, u32 downloaded_size);
     void set_payload(const ByteBuffer&);
-    void set_response_headers(const HashMap<String, String>&);
+    void set_response_headers(const HashMap<String, String, CaseInsensitiveStringTraits>&);
 
 private:
     i32 m_id;
@@ -65,6 +65,6 @@ private:
     Optional<u32> m_total_size {};
     size_t m_downloaded_size { 0 };
     ByteBuffer m_payload;
-    HashMap<String, String> m_response_headers;
+    HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
     WeakPtr<PSClientConnection> m_client;
 };