diff --git a/src/oatpp-swagger/AsyncController.hpp b/src/oatpp-swagger/AsyncController.hpp
index f1e5140..e4270ec 100644
--- a/src/oatpp-swagger/AsyncController.hpp
+++ b/src/oatpp-swagger/AsyncController.hpp
@@ -154,9 +154,14 @@ class AsyncController : public oatpp::web::server::api::ApiController {
         auto body = std::make_shared<oatpp::web::protocol::http::outgoing::StreamingBody>(
           controller->m_resources->getResourceStream(filename->c_str())
         );
-        return _return(OutgoingResponse::createShared(Status::CODE_200, body));
+        auto resp = OutgoingResponse::createShared(Status::CODE_200, body);
+        resp->putHeader("Content-Type", controller->m_resources->getMimeType(filename));
+        return _return(resp);
       }
-      return _return(controller->createResponse(Status::CODE_200, controller->m_resources->getResource(filename->c_str())));
+      auto resp = controller->createResponse(Status::CODE_200,
+                                               controller->m_resources->getResource(filename->c_str()));
+      resp->putHeader("Content-Type", controller->m_resources->getMimeType(filename));
+      return _return(resp);
     }
     
   };
diff --git a/src/oatpp-swagger/Controller.hpp b/src/oatpp-swagger/Controller.hpp
index b26c3d5..836cdb0 100644
--- a/src/oatpp-swagger/Controller.hpp
+++ b/src/oatpp-swagger/Controller.hpp
@@ -134,9 +134,13 @@ class Controller : public oatpp::web::server::api::ApiController {
       auto body = std::make_shared<oatpp::web::protocol::http::outgoing::StreamingBody>(
         m_resources->getResourceStream(filename->c_str())
       );
-      return OutgoingResponse::createShared(Status::CODE_200, body);
+      auto resp = OutgoingResponse::createShared(Status::CODE_200, body);
+      resp->putHeader("Content-Type", m_resources->getMimeType(filename));
+      return resp;
     }
-    return createResponse(Status::CODE_200, m_resources->getResource(filename->c_str()));
+    auto resp = createResponse(Status::CODE_200, m_resources->getResource(filename->c_str()));
+    resp->putHeader("Content-Type", m_resources->getMimeType(filename));
+    return resp;
   }
   
 #include OATPP_CODEGEN_END(ApiController)
diff --git a/src/oatpp-swagger/Resources.cpp b/src/oatpp-swagger/Resources.cpp
index 111a82c..56135f6 100644
--- a/src/oatpp-swagger/Resources.cpp
+++ b/src/oatpp-swagger/Resources.cpp
@@ -104,4 +104,26 @@ v_io_size Resources::ReadCallback::read(void *buffer, v_buff_size count, async::
   return m_stream.read(buffer, count, action);
 }
 
+bool Resources::hasEnding(std::string fullString, std::string const &ending) const {
+    std::transform(fullString.begin(), fullString.end(), fullString.begin(),
+                   [](unsigned char c) { return std::tolower(c); });
+    if (fullString.length() >= ending.length()) {
+        return (0 == fullString.compare(fullString.length() - ending.length(), ending.length(), ending));
+    } else {
+        return false;
+    }
+}
+
+std::string Resources::getMimeType(const std::string &filename) const {
+    if (hasEnding(filename, ".html")) return "text/html";
+    if (hasEnding(filename, ".jpg")) return "image/jpeg";
+    if (hasEnding(filename, ".jpeg")) return "image/jpeg";
+    if (hasEnding(filename, ".png")) return "image/png";
+    if (hasEnding(filename, ".gif")) return "image/gif";
+    if (hasEnding(filename, ".css")) return "text/css";
+    if (hasEnding(filename, ".js")) return "text/javascript";
+    if (hasEnding(filename, ".xml")) return "text/xml";
+    return "text/plain";
+}
+
 }}
diff --git a/src/oatpp-swagger/Resources.hpp b/src/oatpp-swagger/Resources.hpp
index 32c79b1..11c12e3 100644
--- a/src/oatpp-swagger/Resources.hpp
+++ b/src/oatpp-swagger/Resources.hpp
@@ -45,6 +45,7 @@ class Resources {
 private:
   oatpp::String loadFromFile(const char* fileName);
   void cacheResource(const char* fileName);
+  bool hasEnding(std::string fullString, std::string const &ending) const;
 
   class ReadCallback : public oatpp::data::stream::ReadCallback {
    private:
@@ -126,6 +127,13 @@ class Resources {
   bool isStreaming() {
     return m_streaming;
   }
+
+  /**
+   * Returns the MIME type for a given filename
+   * @param filename to return the MIME type
+   * @return a MIME type
+   */
+  std::string getMimeType(const std::string &filename) const;
 };
   
 }}