diff --git a/agents/libhttpagent.go b/agents/libhttpagent.go
index 6b3a24085..2591b458d 100644
--- a/agents/libhttpagent.go
+++ b/agents/libhttpagent.go
@@ -54,7 +54,7 @@ func newHAReplyEncoder(encType string,
 }
 
 func newHTTPUrlDP(req *http.Request) (dP engine.DataProvider, err error) {
-	dP = &httpUrlDP{req: req}
+	dP = &httpUrlDP{req: req, cache: engine.NewNavigableMap(nil)}
 	return
 }
 
@@ -62,25 +62,43 @@ func newHTTPUrlDP(req *http.Request) (dP engine.DataProvider, err error) {
 // decoded data is only searched once and cached
 type httpUrlDP struct {
 	req   *http.Request
-	cache engine.NavigableMap
+	cache *engine.NavigableMap
 }
 
 // String is part of engine.DataProvider interface
-func (url *httpUrlDP) String() string {
-	return utils.ToJSON(url.cache.AsMapStringInterface())
+// when called, it will display the already parsed values out of cache
+func (hU *httpUrlDP) String() string {
+	return utils.ToJSON(hU.cache.AsMapStringInterface())
 }
 
 // FieldAsInterface is part of engine.DataProvider interface
-func (url *httpUrlDP) FieldAsInterface(fldPath []string) (data interface{}, err error) {
+func (hU *httpUrlDP) FieldAsInterface(fldPath []string) (data interface{}, err error) {
+	if len(fldPath) != 1 {
+		return nil, utils.ErrNotFound
+	}
+	if data, err = hU.cache.FieldAsInterface(fldPath); err == nil ||
+		err != utils.ErrNotFound { // item found in cache
+		return
+	}
+	err = nil // cancel previous err
+	data = hU.req.FormValue(fldPath[0])
+	hU.cache.Set(fldPath, data, false)
 	return
 }
 
 // FieldAsString is part of engine.DataProvider interface
-func (url *httpUrlDP) FieldAsString(fldPath []string) (data string, err error) {
+func (hU *httpUrlDP) FieldAsString(fldPath []string) (data string, err error) {
+	var valIface interface{}
+	valIface, err = hU.FieldAsInterface(fldPath)
+	if err != nil {
+		return
+	}
+	data, _ = utils.CastFieldIfToString(valIface)
 	return
 }
 
 // AsNavigableMap is part of engine.DataProvider interface
-func (url *httpUrlDP) AsNavigableMap([]*config.CfgCdrField) (nm *engine.NavigableMap, err error) {
-	return
+func (hU *httpUrlDP) AsNavigableMap([]*config.CfgCdrField) (
+	nm *engine.NavigableMap, err error) {
+	return nil, utils.ErrNotImplemented
 }
diff --git a/agents/libhttpagent_test.go b/agents/libhttpagent_test.go
new file mode 100644
index 000000000..c397b92c4
--- /dev/null
+++ b/agents/libhttpagent_test.go
@@ -0,0 +1,49 @@
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package agents
+
+import (
+	"bufio"
+	"net/http"
+	"strings"
+	"testing"
+	//"github.com/cgrates/cgrates/utils"
+)
+
+func TestHttpUrlDPFieldAsInterface(t *testing.T) {
+	br := bufio.NewReader(strings.NewReader(`GET /cdr?request_type=MOSMS_CDR&timestamp=2008-08-15%2017:49:21&message_date=2008-08-15%2017:49:21&transactionid=100744&CDR_ID=123456&carrierid=1&mcc=222&mnc=10&imsi=235180000000000&msisdn=%2B4977000000000&destination=%2B497700000001&message_status=0&IOT=0&service_id=1 HTTP/1.1
+Host: api.cgrates.org
+
+`))
+	req, err := http.ReadRequest(br)
+	if err != nil {
+		t.Error(err)
+	}
+	hU, _ := newHTTPUrlDP(req)
+	if data, err := hU.FieldAsString([]string{"request_type"}); err != nil {
+		t.Error(err)
+	} else if data != "MOSMS_CDR" {
+		t.Errorf("expecting: MOSMS_CDR, received: <%s>", data)
+	}
+	if data, err := hU.FieldAsString([]string{"nonexistent"}); err != nil {
+		t.Error(err)
+	} else if data != "" {
+		t.Errorf("received: <%s>", data)
+	}
+}