Return 404 if image is not found

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.2)
 project(libravatarserv
-        VERSION 0.2.3
+        VERSION 0.2.4
         LANGUAGES CXX
 )
 

src/libravatarserv.cpp

@@ -55,8 +55,6 @@ int main()
         cerr << "Error: Invalid URL.\n";
         return 1;
     }
-    cout << "Content-type: image/png\n\n";
-    cout.flush();   // We need to flush before we use /dev/stdout directly.
 
     uint16_t size = 80;
     string digest = request.substr(8);
@@ -75,11 +73,14 @@ int main()
     image::Image answer = image::get(digest, size);
     if (answer.error == 0)
     {
+        cout << "Content-type: image/png\n\n";
+        cout.flush();   // We need to flush before we use /dev/stdout directly.
         // answer.image.write("test.png");
         answer.image.write("/dev/stdout");
     }
     else
     {
+        cout << "Status: 404 Not Found\n\n";
         cerr << "Error " << std::to_string(answer.error) << ": Could not open file.\n";
     }