Java

Common HTTP 1.1 Response Headers [1]

• Cache-Control (1.1) and Pragma (1.0)
  A no-cache value prevents browsers from caching page.
   
• Content-Disposition
  Lets you request that the browser ask the user to save the response to disk in a file of the given name
  Ex.:
  Content-Disposition: attachment; filename=file-name
   
• Content-Encoding
  The way document is encoded.
   
• Content-Length
  The number of bytes in the response.
  See setContentLength on previous slide.
  Use ByteArrayOutputStream to buffer document before sending it, so that you can determine size.
   
• Content-Type
  The MIME type of the document being returned.
  Use setContentType to set this header.
   
• Expires
  The time at which document should be considered out-of-date and thus should no longer be cached.
  In java servlets use setDateHeader to set this header.
   
• Last-Modified
  The time document was last changed.
  Don’t set this header explicitly; provide a getLastModified method instead.
   
• Location
  The URL to which browser should reconnect.
  Use sendRedirect instead of setting this directly.
   
• Refresh
  The number of seconds until browser should reload page.
  Can also include URL to connect to.
   
• Set-Cookie
  The cookies that browser should remember. Don’t set this header directly, use addCookie instead.
   
• WWW-Authenticate
  The authorization type and realm needed in Authorization header.