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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 
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The HTTP 304 Not Modified client redirection response code indicates that there is no need to retransmit the requested resources. It is an implicit redirection to a cached resource.
js file to be cached you'll either need to set the no-cache directive in the app (ie- the ASP.NET code) or you'll need to change the Cache-Control header in the request to use the no-store directive instead of no-cache .
The HTTP status code 304 means Not Modified – the web page you requested hasn't changed since the last time you accessed it. After that, your browser will retrieve the cached version of the web page in your local storage.
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
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