java - Servlet response should be cached but isn't -

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I am trying to cache servlet feedback, but in some way it is not working (firebug me 200 releases I'm doing the page). The code I added to this subnet: 

  response.setContentType ("Application / JavaScript"); Long time = System.currentTimeMillis (); Response.setCharacterEncoding ("UTF-8"); Response.setDateHeader ("Last-Modified", 0); Response.addHeader ("Cash-Control", "Max-Age = 5184000"); Response.setDateHeader ("End", now + 5184000 * 1000); Response.addHeader ("different", "host");   
 I have also tried with  setHeader  and  last-modified , now.  
 Nothing seems to work. Any ideas?  
 Thank you  
 This way Firebug shows me the response / request header (when the resource should be taken from the cache, but not):  
  Response HeadersViews Source Cache-Control Max-Age = 5184000 Connection-Live Content-Type Application / Javascript; Charset = UTF-8 Date gurus, 21 March 2013 09:53:48 GMT Sun expiry, 31 March 2013 16: 51:01 GMT Elite timeout = 15, Max = 99 HeadersVisue Request Request * / * Accept- Encoding gzip, display acceptance-language n-US, n; Q = 0.5 cache-control max-age = 0   
 
 
  last-modified < Using / code> requires cooperative coding in your servlet when you send it to a customer, then the client will be sent back, when the same resource is requested, one of the possible sets of headers :  
     
  •  If- Modified-Since:    
  •  If- Unfamiliar- to:     
     Take action on these headings Security will, to determine whether material or given since been changed or not date and then 304 response was not this case. Many of the manual work also keep in mind that  should be last modified  date (example:  Tuesday, 15 November, 1994 12:45:26 GMT ).  
     The easiest way for you to ignore the route  last-modified  for now and instead of  cache-control  and  end < Use the / code> header. Your  ending  header needs to be in a valid date format, as described for the  last modified  header.  
     You can read more on caching, inside, inside

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