diff --git a/.travis.yml b/.travis.yml
index f3f1b576..67efe057 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ services:
   - mysql
   - postgresql
   - memcached
-  - etcd
+  - docker
 env:
   global:
     - GO_REPO_FULLNAME="github.com/astaxie/beego"
@@ -27,17 +27,33 @@ before_install:
   - cd ssdb
   - make
   - cd ..
+  #  - prepare etcd
   #  - prepare for etcd unit tests
-  - git clone https://github.com/etcd-io/etcd.git
-  - cd etcd
-  - ./build
-  - ./bin/etcd
-  - ./bin/etcdctl put current.float 1.23
-  - ./bin/etcdctl put current.bool true
-  - ./bin/etcdctl put current.int 11
-  - ./bin/etcdctl put current.string hello
-  - ./bin/etcdctl put current.serialize.name test
-  - cd ..
+  - rm -rf /tmp/etcd-data.tmp
+  - mkdir -p /tmp/etcd-data.tmp
+  - docker rmi gcr.io/etcd-development/etcd:v3.3.25 || true &&
+    docker run -d
+    -p 2379:2379
+    -p 2380:2380
+    --mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data
+    --name etcd-gcr-v3.3.25
+    gcr.io/etcd-development/etcd:v3.3.25
+    /usr/local/bin/etcd
+    --name s1
+    --data-dir /etcd-data
+    --listen-client-urls http://0.0.0.0:2379
+    --advertise-client-urls http://0.0.0.0:2379
+    --listen-peer-urls http://0.0.0.0:2380
+    --initial-advertise-peer-urls http://0.0.0.0:2380
+    --initial-cluster s1=http://0.0.0.0:2380
+    --initial-cluster-token tkn
+    --initial-cluster-state new
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put current.float 1.23"
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put current.bool true"
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put current.int 11"
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put current.string hello"
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put current.serialize.name test"
+  - docker exec etcd-gcr-v3.3.25 /bin/sh -c "ETCDCTL_API=3 /usr/local/bin/etcdctl put sub.sub.key1 sub.sub.key"
 install:
   - go get github.com/lib/pq
   - go get github.com/go-sql-driver/mysql
@@ -64,6 +80,8 @@ install:
   - go get -u golang.org/x/lint/golint
   - go get -u github.com/go-redis/redis
 before_script:
+
+  #  -
   - psql --version
   #  - prepare for orm unit tests
   - sh -c "if [ '$ORM_DRIVER' = 'postgres' ]; then psql -c 'create database orm_test;' -U postgres; fi"
@@ -84,4 +102,4 @@ script:
   - find . ! \( -path './vendor' -prune \) -type f -name '*.go' -print0 | xargs -0 gofmt -l -s
   - golint ./...
 addons:
-  postgresql: "9.6"
+  postgresql: "9.6"
\ No newline at end of file
diff --git a/pkg/client/httplib/testing/client.go b/pkg/client/httplib/testing/client.go
index 19e6cd23..863ed0e8 100644
--- a/pkg/client/httplib/testing/client.go
+++ b/pkg/client/httplib/testing/client.go
@@ -34,7 +34,10 @@ func getPort() string {
 		if err != nil {
 			return "8080"
 		}
-		port = config.String("httpport")
+		port, err = config.String("httpport")
+		if err != nil {
+			return "8080"
+		}
 		return port
 	}
 	return port
diff --git a/pkg/infrastructure/config/config.go b/pkg/infrastructure/config/config.go
index 3514e425..c7f45469 100644
--- a/pkg/infrastructure/config/config.go
+++ b/pkg/infrastructure/config/config.go
@@ -131,7 +131,7 @@ func (c *BaseConfiger) Float(key string) (float64, error) {
 // DefaultString returns the string value for a given key.
 // if err != nil or value is empty return defaultval
 func (c *BaseConfiger) DefaultString(key string, defaultVal string) string {
-	if res, err := c.String(key); res != "" && err != nil {
+	if res, err := c.String(key); res != "" && err == nil {
 		return res
 	}
 	return defaultVal
@@ -140,7 +140,7 @@ func (c *BaseConfiger) DefaultString(key string, defaultVal string) string {
 // DefaultStrings returns the []string value for a given key.
 // if err != nil return defaultval
 func (c *BaseConfiger) DefaultStrings(key string, defaultVal []string) []string {
-	if res, err := c.Strings(key); len(res) > 0 && err != nil {
+	if res, err := c.Strings(key); len(res) > 0 && err == nil {
 		return res
 	}
 	return defaultVal
diff --git a/pkg/infrastructure/config/ini.go b/pkg/infrastructure/config/ini.go
index 4d3946d5..2338b3cf 100644
--- a/pkg/infrastructure/config/ini.go
+++ b/pkg/infrastructure/config/ini.go
@@ -17,14 +17,13 @@ package config
 import (
 	"bufio"
 	"bytes"
-	"context"
 	"errors"
-	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
 	"os/user"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"sync"
 )
@@ -66,9 +65,6 @@ func (ini *IniConfig) parseData(dir string, data []byte) (*IniConfigContainer, e
 		keyComment:     make(map[string]string),
 		RWMutex:        sync.RWMutex{},
 	}
-	cfg.BaseConfiger = NewBaseConfiger(func(ctx context.Context, key string) (string, error) {
-		return cfg.getdata(key)
-	})
 	cfg.Lock()
 	defer cfg.Unlock()
 
@@ -94,7 +90,7 @@ func (ini *IniConfig) parseData(dir string, data []byte) (*IniConfigContainer, e
 				break
 			}
 
-			// It might be a good idea to throw a error on all unknonw errors?
+			//It might be a good idea to throw a error on all unknonw errors?
 			if _, ok := err.(*os.PathError); ok {
 				return nil, err
 			}
@@ -236,6 +232,101 @@ type IniConfigContainer struct {
 	sync.RWMutex
 }
 
+// Bool returns the boolean value for a given key.
+func (c *IniConfigContainer) Bool(key string) (bool, error) {
+	return ParseBool(c.getdata(key))
+}
+
+// DefaultBool returns the boolean value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultBool(key string, defaultval bool) bool {
+	v, err := c.Bool(key)
+	if err != nil {
+		return defaultval
+	}
+	return v
+}
+
+// Int returns the integer value for a given key.
+func (c *IniConfigContainer) Int(key string) (int, error) {
+	return strconv.Atoi(c.getdata(key))
+}
+
+// DefaultInt returns the integer value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultInt(key string, defaultval int) int {
+	v, err := c.Int(key)
+	if err != nil {
+		return defaultval
+	}
+	return v
+}
+
+// Int64 returns the int64 value for a given key.
+func (c *IniConfigContainer) Int64(key string) (int64, error) {
+	return strconv.ParseInt(c.getdata(key), 10, 64)
+}
+
+// DefaultInt64 returns the int64 value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultInt64(key string, defaultval int64) int64 {
+	v, err := c.Int64(key)
+	if err != nil {
+		return defaultval
+	}
+	return v
+}
+
+// Float returns the float value for a given key.
+func (c *IniConfigContainer) Float(key string) (float64, error) {
+	return strconv.ParseFloat(c.getdata(key), 64)
+}
+
+// DefaultFloat returns the float64 value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultFloat(key string, defaultval float64) float64 {
+	v, err := c.Float(key)
+	if err != nil {
+		return defaultval
+	}
+	return v
+}
+
+// String returns the string value for a given key.
+func (c *IniConfigContainer) String(key string) (string, error) {
+	return c.getdata(key), nil
+}
+
+// DefaultString returns the string value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultString(key string, defaultval string) string {
+	v, err := c.String(key)
+	if v == "" || err != nil {
+		return defaultval
+	}
+	return v
+}
+
+// Strings returns the []string value for a given key.
+// Return nil if config value does not exist or is empty.
+func (c *IniConfigContainer) Strings(key string) ([]string, error) {
+	v, err := c.String(key)
+	if v == "" || err != nil {
+		return nil, err
+	}
+	return strings.Split(v, ";"), nil
+}
+
+// DefaultStrings returns the []string value for a given key.
+// if err != nil return defaultval
+func (c *IniConfigContainer) DefaultStrings(key string, defaultval []string) []string {
+	v, err := c.Strings(key)
+	if v == nil || err != nil {
+		return defaultval
+	}
+	return v
+}
+
 // GetSection returns map for the given section
 func (c *IniConfigContainer) GetSection(section string) (map[string]string, error) {
 	if v, ok := c.data[section]; ok {
@@ -383,9 +474,9 @@ func (c *IniConfigContainer) DIY(key string) (v interface{}, err error) {
 }
 
 // section.key or key
-func (c *IniConfigContainer) getdata(key string) (string, error) {
+func (c *IniConfigContainer) getdata(key string) string {
 	if len(key) == 0 {
-		return "", errors.New("the key is empty")
+		return ""
 	}
 	c.RLock()
 	defer c.RUnlock()
@@ -403,10 +494,10 @@ func (c *IniConfigContainer) getdata(key string) (string, error) {
 	}
 	if v, ok := c.data[section]; ok {
 		if vv, ok := v[k]; ok {
-			return vv, nil
+			return vv
 		}
 	}
-	return "", errors.New(fmt.Sprintf("config not found: %s", key))
+	return ""
 }
 
 func init() {
diff --git a/pkg/infrastructure/config/json/json.go b/pkg/infrastructure/config/json/json.go
index b552269a..975e1523 100644
--- a/pkg/infrastructure/config/json/json.go
+++ b/pkg/infrastructure/config/json/json.go
@@ -165,7 +165,35 @@ func (c *JSONConfigContainer) String(key string) (string, error) {
 			return v, nil
 		}
 	}
-	return "", errors.New(fmt.Sprintf("config not found or is not string, key: %s", key))
+	return "", nil
+}
+
+// DefaultString returns the string value for a given key.
+// if err != nil return defaultval
+func (c *JSONConfigContainer) DefaultString(key string, defaultval string) string {
+	// TODO FIXME should not use "" to replace non existence
+	if v, err := c.String(key); v != "" && err == nil {
+		return v
+	}
+	return defaultval
+}
+
+// Strings returns the []string value for a given key.
+func (c *JSONConfigContainer) Strings(key string) ([]string, error) {
+	stringVal, err := c.String(key)
+	if stringVal == "" || err != nil {
+		return nil, err
+	}
+	return strings.Split(stringVal, ";"), nil
+}
+
+// DefaultStrings returns the []string value for a given key.
+// if err != nil return defaultval
+func (c *JSONConfigContainer) DefaultStrings(key string, defaultval []string) []string {
+	if v, err := c.Strings(key); v != nil && err == nil {
+		return v
+	}
+	return defaultval
 }
 
 // GetSection returns map for the given section
diff --git a/pkg/infrastructure/config/xml/xml.go b/pkg/infrastructure/config/xml/xml.go
index c095ef06..49aab33e 100644
--- a/pkg/infrastructure/config/xml/xml.go
+++ b/pkg/infrastructure/config/xml/xml.go
@@ -26,7 +26,7 @@
 //
 //  cnf, err := config.NewConfig("xml", "config.xml")
 //
-// More docs http://beego.me/docs/module/config.md
+//More docs http://beego.me/docs/module/config.md
 package xml
 
 import (
@@ -36,11 +36,11 @@ import (
 	"io/ioutil"
 	"os"
 	"strconv"
+	"strings"
 	"sync"
 
-	"github.com/beego/x2j"
-
 	"github.com/astaxie/beego/pkg/infrastructure/config"
+	"github.com/beego/x2j"
 )
 
 // Config is a xml config parser and implements Config interface.
@@ -148,7 +148,7 @@ func (c *ConfigContainer) String(key string) (string, error) {
 	if v, ok := c.data[key].(string); ok {
 		return v, nil
 	}
-	return "", errors.New(fmt.Sprintf("configuration not found or not string, key: %s", key))
+	return "", nil
 }
 
 // DefaultString returns the string value for a given key.
@@ -161,6 +161,25 @@ func (c *ConfigContainer) DefaultString(key string, defaultval string) string {
 	return v
 }
 
+// Strings returns the []string value for a given key.
+func (c *ConfigContainer) Strings(key string) ([]string, error) {
+	v, err := c.String(key)
+	if v == "" || err != nil {
+		return nil, err
+	}
+	return strings.Split(v, ";"), nil
+}
+
+// DefaultStrings returns the []string value for a given key.
+// if err != nil return defaultval
+func (c *ConfigContainer) DefaultStrings(key string, defaultval []string) []string {
+	v, err := c.Strings(key)
+	if v == nil || err != nil {
+		return defaultval
+	}
+	return v
+}
+
 // GetSection returns map for the given section
 func (c *ConfigContainer) GetSection(section string) (map[string]string, error) {
 	if v, ok := c.data[section].(map[string]interface{}); ok {
diff --git a/pkg/infrastructure/config/yaml/yaml.go b/pkg/infrastructure/config/yaml/yaml.go
index 96045365..ddd556e6 100644
--- a/pkg/infrastructure/config/yaml/yaml.go
+++ b/pkg/infrastructure/config/yaml/yaml.go
@@ -214,11 +214,9 @@ func (c *ConfigContainer) String(key string) (string, error) {
 	if v, err := c.getData(key); err == nil {
 		if vv, ok := v.(string); ok {
 			return vv, nil
-		} else {
-			return "", errors.New(fmt.Sprintf("the value is not string, key: %s, value: %v", key, v))
 		}
 	}
-	return "", errors.New(fmt.Sprintf("configuration not found, key: %s", key))
+	return "", nil
 }
 
 // DefaultString returns the string value for a given key.
diff --git a/pkg/server/web/config.go b/pkg/server/web/config.go
index 3abe255e..b2e38a80 100644
--- a/pkg/server/web/config.go
+++ b/pkg/server/web/config.go
@@ -32,8 +32,8 @@ import (
 
 // Config is the main struct for BConfig
 type Config struct {
-	AppName             string //Application name
-	RunMode             string //Running Mode: dev | prod
+	AppName             string // Application name
+	RunMode             string // Running Mode: dev | prod
 	RouterCaseSensitive bool
 	ServerName          string
 	RecoverPanic        bool
@@ -113,8 +113,8 @@ type SessionConfig struct {
 // LogConfig holds Log related config
 type LogConfig struct {
 	AccessLogs       bool
-	EnableStaticLogs bool   //log static files requests default: false
-	AccessLogsFormat string //access log format: JSON_FORMAT, APACHE_FORMAT or empty string
+	EnableStaticLogs bool   // log static files requests default: false
+	AccessLogsFormat string // access log format: JSON_FORMAT, APACHE_FORMAT or empty string
 	FileLineNum      bool
 	Outputs          map[string]string // Store Adaptor : config
 }
@@ -210,7 +210,7 @@ func newBConfig() *Config {
 		RecoverFunc:         recoverPanic,
 		CopyRequestBody:     false,
 		EnableGzip:          false,
-		MaxMemory:           1 << 26, //64MB
+		MaxMemory:           1 << 26, // 64MB
 		EnableErrorsShow:    true,
 		EnableErrorsRender:  true,
 		Listen: Listen{
@@ -258,7 +258,7 @@ func newBConfig() *Config {
 				SessionGCMaxLifetime:         3600,
 				SessionProviderConfig:        "",
 				SessionDisableHTTPOnly:       false,
-				SessionCookieLifeTime:        0, //set cookie default is the browser life
+				SessionCookieLifeTime:        0, // set cookie default is the browser life
 				SessionAutoSetCookie:         true,
 				SessionDomain:                "",
 				SessionEnableSidInHTTPHeader: false, // enable store/get the sessionId into/from http headers
@@ -292,11 +292,11 @@ func assignConfig(ac config.Configer) error {
 	// set the run mode first
 	if envRunMode := os.Getenv("BEEGO_RUNMODE"); envRunMode != "" {
 		BConfig.RunMode = envRunMode
-	} else if runMode := ac.String("RunMode"); runMode != "" {
+	} else if runMode, err := ac.String("RunMode"); runMode != "" && err == nil {
 		BConfig.RunMode = runMode
 	}
 
-	if sd := ac.String("StaticDir"); sd != "" {
+	if sd, err := ac.String("StaticDir"); sd != "" && err == nil {
 		BConfig.WebConfig.StaticDir = map[string]string{}
 		sds := strings.Fields(sd)
 		for _, v := range sds {
@@ -308,7 +308,7 @@ func assignConfig(ac config.Configer) error {
 		}
 	}
 
-	if sgz := ac.String("StaticExtensionsToGzip"); sgz != "" {
+	if sgz, err := ac.String("StaticExtensionsToGzip"); sgz != "" && err == nil {
 		extensions := strings.Split(sgz, ",")
 		fileExts := []string{}
 		for _, ext := range extensions {
@@ -334,7 +334,7 @@ func assignConfig(ac config.Configer) error {
 		BConfig.WebConfig.StaticCacheFileNum = sfn
 	}
 
-	if lo := ac.String("LogOutputs"); lo != "" {
+	if lo, err := ac.String("LogOutputs"); lo != "" && err == nil {
 		// if lo is not nil or empty
 		// means user has set his own LogOutputs
 		// clear the default setting to BConfig.Log.Outputs
@@ -349,7 +349,7 @@ func assignConfig(ac config.Configer) error {
 		}
 	}
 
-	//init log
+	// init log
 	logs.Reset()
 	for adaptor, config := range BConfig.Log.Outputs {
 		err := logs.SetLogger(adaptor, config)
@@ -388,7 +388,7 @@ func assignSingleConfig(p interface{}, ac config.Configer) {
 			pf.SetBool(ac.DefaultBool(name, pf.Bool()))
 		case reflect.Struct:
 		default:
-			//do nothing here
+			// do nothing here
 		}
 	}
 
@@ -431,16 +431,16 @@ func (b *beegoAppConfig) Set(key, val string) error {
 	return nil
 }
 
-func (b *beegoAppConfig) String(key string) string {
-	if v := b.innerConfig.String(BConfig.RunMode + "::" + key); v != "" {
-		return v
+func (b *beegoAppConfig) String(key string) (string, error) {
+	if v, err := b.innerConfig.String(BConfig.RunMode + "::" + key); v != "" && err == nil {
+		return v, nil
 	}
 	return b.innerConfig.String(key)
 }
 
-func (b *beegoAppConfig) Strings(key string) []string {
-	if v := b.innerConfig.Strings(BConfig.RunMode + "::" + key); len(v) > 0 {
-		return v
+func (b *beegoAppConfig) Strings(key string) ([]string, error) {
+	if v, err := b.innerConfig.Strings(BConfig.RunMode + "::" + key); len(v) > 0 && err == nil {
+		return v, nil
 	}
 	return b.innerConfig.Strings(key)
 }
@@ -474,14 +474,14 @@ func (b *beegoAppConfig) Float(key string) (float64, error) {
 }
 
 func (b *beegoAppConfig) DefaultString(key string, defaultVal string) string {
-	if v := b.String(key); v != "" {
+	if v, err := b.String(key); v != "" && err == nil {
 		return v
 	}
 	return defaultVal
 }
 
 func (b *beegoAppConfig) DefaultStrings(key string, defaultVal []string) []string {
-	if v := b.Strings(key); len(v) != 0 {
+	if v, err := b.Strings(key); len(v) != 0 && err == nil {
 		return v
 	}
 	return defaultVal
diff --git a/pkg/server/web/hooks.go b/pkg/server/web/hooks.go
index 13194733..ae54f190 100644
--- a/pkg/server/web/hooks.go
+++ b/pkg/server/web/hooks.go
@@ -48,9 +48,9 @@ func registerDefaultErrorHandler() error {
 func registerSession() error {
 	if BConfig.WebConfig.Session.SessionOn {
 		var err error
-		sessionConfig := AppConfig.String("sessionConfig")
+		sessionConfig, err := AppConfig.String("sessionConfig")
 		conf := new(session.ManagerConfig)
-		if sessionConfig == "" {
+		if sessionConfig == "" || err != nil {
 			conf.CookieName = BConfig.WebConfig.Session.SessionName
 			conf.EnableSetCookie = BConfig.WebConfig.Session.SessionAutoSetCookie
 			conf.Gclifetime = BConfig.WebConfig.Session.SessionGCMaxLifetime
diff --git a/pkg/server/web/templatefunc.go b/pkg/server/web/templatefunc.go
index 6d132bf0..34d71aab 100644
--- a/pkg/server/web/templatefunc.go
+++ b/pkg/server/web/templatefunc.go
@@ -160,7 +160,7 @@ func NotNil(a interface{}) (isNil bool) {
 func GetConfig(returnType, key string, defaultVal interface{}) (value interface{}, err error) {
 	switch returnType {
 	case "String":
-		value = AppConfig.String(key)
+		value, err = AppConfig.String(key)
 	case "Bool":
 		value, err = AppConfig.Bool(key)
 	case "Int":
diff --git a/scripts/prepare_etcd.sh b/scripts/prepare_etcd.sh
index a65f00a3..d34c05a3 100644
--- a/scripts/prepare_etcd.sh
+++ b/scripts/prepare_etcd.sh
@@ -4,4 +4,5 @@ etcdctl put current.float 1.23
 etcdctl put current.bool true
 etcdctl put current.int 11
 etcdctl put current.string hello
-etcdctl put current.serialize.name test
\ No newline at end of file
+etcdctl put current.serialize.name test
+etcdctl put sub.sub.key1 sub.sub.key
\ No newline at end of file