question: private boolean maybeStream ( Path p , HttpServletRequest req , HttpServletResponse rsp ) throws IOException { try { if ( Files . size ( p ) < cacheFileSizeLimitBytes ) { return false ; } } catch ( NoSuchFileException e ) { cache . put ( p , Resource . NOT_FOUND ) ; notFound ( rsp ) ; return true ; } long lastModified = FileUtil . lastModified ( p ) ; if ( req . getDateHeader ( IF_MODIFIED_SINCE ) >= lastModified ) { rsp . setStatus ( SC_NOT_MODIFIED ) ; return true ; } if ( lastModified > 0 ) { rsp . setDateHeader ( LAST_MODIFIED , lastModified ) ; } if ( ! CacheHeaders . hasCacheHeader ( rsp ) ) { CacheHeaders . setCacheable ( req , rsp , 15 , MINUTES , refresh ) ; } rsp . setContentType ( contentType ( p . toString ( ) ) ) ; OutputStream out = rsp . getOutputStream ( ) ; GZIPOutputStream gz = null ; if ( RPCServletUtils . acceptsGzipEncoding ( req ) ) { rsp . setHeader ( CONTENT_ENCODING , "gzip" ) ; gz = new GZIPOutputStream ( out ) ; out = gz ; } Files . copy ( p , out ) ; if ( gz != null ) { gz . finish ( ) ; } return true ; }
target:  Maybe stream a path to the response, depending on the properties of the file and cache headers in the request.