Update src/main.zig

src/main.zig

@@ -7,6 +7,8 @@ const allocator = std.heap.c_allocator;
 var instance: ZigSmartSearch = undefined;
 
 fn on_request(r: zap.Request) !void {
+    try r.setHeader("Content-Type", "application/json");
+    try r.setHeader("Access-Control-Allow-Origin", "*");
     if (r.query) |the_query| {
         var results = try instance.search(the_query);
         defer results.deinit();