Now the http_client will send the form parameters urlencoded if this is possible (instead of multipart form data)

Note for now, the library does not support sending file and form parameters at the same time.

library/client/http_client/src/http_client_request.e

@@ -1,8 +1,10 @@
 note
-	description : "Objects that ..."
-	author      : "$Author$"
-	date        : "$Date$"
-	revision    : "$Revision$"
+	description: "[
+				Object representing a http client request
+				It is mainly used internally by the HTTP_CLIENT_SESSION
+			]"
+	date: "$Date$"
+	revision: "$Revision$"
 
 deferred class
 	HTTP_CLIENT_REQUEST
@@ -152,15 +154,14 @@ feature -- Settings
 
 feature {NONE} -- Utilities
 
-	append_parameters_to_url (a_url: STRING; a_parameters: detachable ARRAY [detachable TUPLE [name: READABLE_STRING_8; value: READABLE_STRING_8]])
+	append_parameters_to_url (a_parameters: HASH_TABLE [READABLE_STRING_32, READABLE_STRING_32]; a_url: STRING)
 			-- Append parameters `a_parameters' to `a_url'
 		require
 			a_url_attached: a_url /= Void
 		local
-			i: INTEGER
 			l_first_param: BOOLEAN
 		do
-			if a_parameters /= Void and then a_parameters.count > 0 then
+			if a_parameters.count > 0 then
 				if a_url.index_of ('?', 1) > 0 then
 					l_first_param := False
 				elseif a_url.index_of ('&', 1) > 0 then
@@ -168,23 +169,22 @@ feature {NONE} -- Utilities
 				else
 					l_first_param := True
 				end
+
 				from
-					i := a_parameters.lower
+					a_parameters.start
 				until
-					i > a_parameters.upper
+					a_parameters.after
 				loop
-					if attached a_parameters[i] as a_param then
-						if l_first_param then
-							a_url.append_character ('?')
-						else
-							a_url.append_character ('&')
-						end
-						a_url.append_string (a_param.name)
-						a_url.append_character ('=')
-						a_url.append_string (a_param.value)
-						l_first_param := False
+					if l_first_param then
+						a_url.append_character ('?')
+					else
+						a_url.append_character ('&')
 					end
-					i := i + 1
+					a_url.append (urlencode (a_parameters.key_for_iteration))
+					a_url.append_character ('=')
+					a_url.append (urlencode (a_parameters.item_for_iteration))
+					l_first_param := False
+					a_parameters.forth
 				end
 			end
 		end