304 not modified on static files

Question

After moving the project to the production server, I found that static files, such as images, will not be returned with status "304 not modified", although there are cache headlines like "Last-Modified" and "Expires".

Request Headers

Accept:image/webp,image/*,*/*;q=0.8 Accept-Encoding:gzip, deflate, sdch Accept-Language:ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4,uk;q=0.2 Cache-Control:max-age=0 Connection:keep-alive Cookie:_LANG=ru DNT:1 Host:test.com If-Modified-Since:Mon, 07 Sep 2015 08:46:37 GMT If-None-Match:"1D0E949B4DCD480" Referer:http://test.com/ru/Some/Index/ User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML,     like Gecko) Chrome/45.0.2454.85 Safari/537.36 

Response headers

HTTP/1.1 200 OK Cache-Control: public Content-Type: image/png Expires: Tue, 08 Sep 2015 14:33:06 GMT Last-Modified: Mon, 07 Sep 2015 08:46:37 GMT Accept-Ranges: bytes ETag: "1D0E949B4DCD480" Server: Microsoft-IIS/8.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Mon, 07 Sep 2015 14:33:06 GMT Content-Length: 5953 

At the local "IIS express" everything works correctly.

Local response headers

HTTP/1.1 304 Not Modified Cache-Control:public Date:Mon, 07 Sep 2015 14:38:12 GMT Etag:"1D04A9052E17E00" 

Prompt, in what could be the reason?

Web.config files are identical.

Thanks!

UPD 1:

UPD 2:

Local machine cache snapshot returns images

C:\Users\dev>netsh http show cachestate  Snapshot cache responses HTTP:: --------------------------------  URL-address: http://dev2-pc:1437/Views/CustomMeme/byby/img/header.jpg Status Code: 200 Команда HTTP: GET Тип политики кэша: Срок жизни (TTL) Срок жизни записи в кэше (сек): 86399 Время создания: 2015.9.8:12.14.41:0 Имя очереди запросов: Clr4IntegratedAppPool{737BCE3B-FD81-4AB4-B976-A3A8C8A-94D8} Тип содержимого: image/jpeg Кодировка содержимого: (null) Длина заголовков: 415 Длина содержимого: 49017 Число обращений: 3 Принудительное отключение после обслуживания: FALSE 

But remote (production) server cache snapshot is empty

C:\Users\Администратор>netsh http show cachestate  Snapshot cache HTTP responses: -------------------------------- The cache contains entries that match the specified URL-address 

Answer 1

Refer Below link and enabling cache manually for contents type based on your requirement and see if its works or not.

https://www.iis.net/configreference/system.webserver/caching