Updated WGI_OUTPUT_STREAM.put_file_content .

Also use `FILE.date` instead of `FILE.change_date` (`change_date` is the date of the last status change, quite often same as creation date, while `date` is the last modification date).

library/network/protocol/http/src/http_header_modifier.e

@@ -508,9 +508,16 @@ feature -- Others
 
 	put_expires (a_seconds: INTEGER)
 			-- Put "Expires" header to `a_seconds' seconds
+			-- and also "Cache-Control: max-age=.." .
+			-- To be supported by most browser.
+		local
+			dt: DATE_TIME
 		do
-			put_expires_string (a_seconds.out)
-		end
+			create dt.make_now_utc
+			dt.second_add (a_seconds)
+			put_expires_date (dt)
+			put_cache_control ("max-age=" + a_seconds.out)
+		end			
 
 	put_expires_string (a_expires: STRING)
 			-- Put "Expires" header with `a_expires' string value

library/server/ewsgi/specification/response/wgi_filter_response.e

@@ -131,6 +131,12 @@ feature -- Output operation
 			wgi_response.put_substring (s, a_begin_index, a_end_index)
 		end
 
+	put_file_content (f: FILE; a_offset: INTEGER; a_count: INTEGER)
+			-- Send `a_count' bytes from the content of file `f' starting at offset `a_offset'.
+		do
+			wgi_response.put_file_content (f, a_offset, a_count)
+		end
+
 	flush
 			-- Flush if it makes sense
 		do

library/server/ewsgi/specification/response/wgi_response.e

@@ -142,6 +142,14 @@ feature -- Output operation
 		deferred
 		end
 
+	put_file_content (f: FILE; a_offset: INTEGER; a_count: INTEGER)
+			-- Send `a_count' bytes from the content of file `f' starting at offset `a_offset'.
+		require
+			message_writable: message_writable
+			not_too_big: a_offset + a_count <= f.count
+		deferred
+		end
+
 	flush
 			-- Flush if it makes sense
 		deferred

library/server/ewsgi/specification/stream/wgi_output_stream.e

@@ -37,6 +37,53 @@ feature -- Output
 			end
 		end
 
+	put_file_content (a_file: FILE; a_offset: INTEGER; a_byte_count: INTEGER)
+			-- Send `a_byte_count' bytes from the content of file `a_file' starting at offset `a_offset'.
+			--| Could be redefined for optimization.
+		require
+			a_file_closed_or_openread: a_file.exists and then (a_file.is_access_readable or a_file.is_closed)
+			is_open_write: is_open_write
+			a_file_not_void: a_file /= Void
+		local
+			l_close_needed: BOOLEAN
+			l_remain: INTEGER
+			l_done: BOOLEAN
+			s: STRING
+		do
+			if a_file.exists and then a_file.is_access_readable then
+				if a_file.is_open_read then
+					l_close_needed := False
+				else
+					l_close_needed := True
+					a_file.open_read
+				end
+				if a_offset > 0 then
+					a_file.move (a_offset)
+				end
+				from
+					l_remain := a_byte_count
+					l_done := False
+				until
+					a_file.exhausted or l_done
+				loop
+					a_file.read_stream (l_remain.min (4_096))
+					s := a_file.last_string
+					if s.is_empty then
+							-- network error?
+						l_done := True
+					else
+						put_string (s)
+						l_remain := l_remain - s.count
+						check l_remain >= 0 end
+						l_done := l_remain = 0
+					end
+				end
+				if l_close_needed then
+					a_file.close
+				end
+			end			
+		end
+
 	put_character (c: CHARACTER_8)
 			-- Write `c' to output stream.
 			--| Could be redefined for optimization			

library/server/ewsgi/src/implementation/wgi_response_stream.e

@@ -103,6 +103,12 @@ feature -- Output operation
 			output.put_substring (s, start_index, end_index)
 		end
 
+	put_file_content (f: FILE; a_offset: INTEGER; a_count: INTEGER)
+			-- Send `a_count' bytes from the content of file `f' starting at offset `a_offset'.
+		do
+			output.put_file_content (f, a_offset, a_count)
+		end
+
 	flush
 		do
 			output.flush

library/server/wsf/router/wsf_file_system_handler.e

@@ -39,6 +39,7 @@ feature {NONE} -- Initialization
 
 	make_with_path (d: like document_root)
 		do
+			max_age := -1
 			if d.is_empty then
 				document_root := execution_environment.current_working_path
 			else
@@ -87,6 +88,7 @@ feature -- Access
 	document_root: PATH
 
 	max_age: INTEGER
+			-- Max age, initialized at -1 by default.	
 
 	index_disabled: BOOLEAN
 			-- Index disabled?
@@ -367,15 +369,17 @@ feature -- Execution
 			create fres.make_with_content_type (ct, f.path.name)
 			fres.set_status_code ({HTTP_STATUS_CODE}.ok)
 
-			-- cache control
+				-- cache control
 			create dt.make_now_utc
-			fres.header.put_cache_control ("private, max-age=" + max_age.out)
 			fres.header.put_utc_date (dt)
-			if max_age > 0 then
-				dt := dt.twin
-				dt.second_add (max_age)
+			if max_age >= 0 then
+				fres.set_max_age (max_age)
+				if max_age > 0 then
+					dt := dt.twin
+					dt.second_add (max_age)
+				end
+				fres.set_expires_date (dt)
 			end
-			fres.header.put_expires_date (dt)
 
 			fres.set_answer_head_request_method (req.request_method.same_string ({HTTP_REQUEST_METHODS}.method_head))
 			res.send (fres)
@@ -388,14 +392,15 @@ feature -- Execution
 		do
 			create dt.make_now_utc
 			create h.make
-			h.put_cache_control ("private, max-age=" + max_age.out)
 			h.put_utc_date (dt)
-			if max_age > 0 then
-				dt := dt.twin
-				dt.second_add (max_age)
+			if max_age >= 0 then
+				h.put_cache_control ("max-age=" + max_age.out)
+				if max_age > 0 then
+					dt := dt.twin
+					dt.second_add (max_age)
+				end
+				h.put_expires_date (dt)
 			end
-			h.put_expires_date (dt)
-
 			if a_utc_date /= Void then
 				h.put_last_modified (a_utc_date)
 			end
@@ -637,7 +642,7 @@ feature {NONE} -- implementation: date time
 		end
 
 note
-	copyright: "2011-2013, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Colin Adams, Eiffel Software and others"
+	copyright: "2011-2016, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Colin Adams, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software

library/server/wsf/src/implementation/wsf_wgi_delayed_header_response.e

@@ -13,6 +13,7 @@ inherit
 			put_character,
 			put_string,
 			put_substring,
+			put_file_content,
 			flush,
 			message_writable,
 			message_committed
@@ -108,6 +109,13 @@ feature -- Output operation
 			Precursor (s, a_begin_index, a_end_index)
 		end
 
+	put_file_content (f: FILE; a_offset: INTEGER; a_count: INTEGER)
+			-- Send `a_count' bytes from the content of file `f' starting at offset `a_offset'.
+		do
+			process_header
+			Precursor (f, a_offset, a_count)
+		end
+
 	flush
 			-- Flush if it makes sense
 		do

library/server/wsf/src/response/wsf_file_response.e

@@ -1,8 +1,7 @@
 note
-	description : "Objects that ..."
-	author      : "$Author$"
-	date        : "$Date$"
-	revision    : "$Revision$"
+	description: "Response to send a file back to the client"
+	date: "$Date$"
+	revision: "$Revision$"
 
 class
 	WSF_FILE_RESPONSE
@@ -105,22 +104,46 @@ feature {NONE} -- Initialization
 
 feature -- Element change
 
-	set_expires_in_seconds (sec: INTEGER)
+	set_max_age (sec: INTEGER)
 		do
-			set_expires (sec.out)
+			header.put_cache_control ("max-age=" + sec.out)
+		end
+
+	set_public_max_age (sec: INTEGER)
+		do
+			header.put_cache_control ("public, max-age=" + sec.out)
+		end
+
+	set_private_max_age (sec: INTEGER)
+		do
+			header.put_cache_control ("private, max-age=" + sec.out)
+		end
+
+	set_expires_in_seconds (sec: INTEGER)
+			-- Set Expires and Cache-control: max-age... to value related `sec' seconds.
+		do
+			header.put_expires (sec)
 		end
 
 	set_expires (s: STRING)
+			-- Set Expires header value to `s'.
 		do
 			header.put_expires_string (s)
 		end
 
+	set_expires_date (dt: DATE_TIME)
+			-- Set Expires header value to date time `dt'.
+		do
+			header.put_expires_date (dt)
+		end
+
 	set_no_cache
 		local
 			h: like header
 		do
 			h := header
 			h.put_expires (0)
+			h.put_cache_control ("max-age=0")
 			h.put_cache_control ("no-cache, must-revalidate")
 			h.put_pragma_no_cache
 		end
@@ -250,7 +273,7 @@ feature {NONE} -- Implementation: file system helper
 			f: RAW_FILE
 		do
 			create f.make_with_path (file_path)
-			create Result.make_from_epoch (f.change_date)
+			create Result.make_from_epoch (f.date)
 		end
 
 	file_extension (fn: PATH): STRING_32
@@ -293,19 +316,11 @@ feature {NONE} -- Implementation: output
 			create f.make_with_path (fn)
 			check f.is_readable end
 
-			f.open_read
-			from
-			until
-				f.exhausted
-			loop
-				f.read_stream (4_096)
-				res.put_string (f.last_string)
-			end
-			f.close
+			res.put_file_content (f, 0, f.count)
 		end
 
 note
-	copyright: "2011-2013, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Eiffel Software and others"
+	copyright: "2011-2016, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Colin Adams, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software

library/server/wsf/src/wsf_response.e

@@ -383,6 +383,16 @@ feature -- Body
 			increment_transfered_content_length (a_end_index - a_begin_index + 1)
 		end
 
+	put_file_content (f: FILE; a_offset: INTEGER; a_count: INTEGER)
+			-- Send `a_count' bytes from the content of file `f' starting at offset `a_offset'.
+		require
+			message_writable: message_writable
+			not_too_big: a_offset + a_count <= f.count
+		do
+			wgi_response.put_file_content (f, a_offset, a_count)
+			increment_transfered_content_length (a_count)
+		end
+
 feature -- Chunk body
 
 	put_chunk (a_content: READABLE_STRING_8; a_ext: detachable READABLE_STRING_8)
@@ -572,7 +582,7 @@ feature {NONE} -- Implemenation
 		end
 
 note
-	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Colin Adams, Eiffel Software and others"
+	copyright: "2011-2016, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Colin Adams, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software