diff --git a/api.go b/api.go
index 16c44a9..32d6363 100644
--- a/api.go
+++ b/api.go
@@ -75,6 +75,9 @@ type Timestamp struct {
 	time.Time
 }
 
+// ContainerID is container ID
+type ContainerID string
+
 // EmptyParameters is empty parameters
 type EmptyParameters struct {
 	// nothing
@@ -250,7 +253,7 @@ type Version struct {
 
 // Extensions contains info about content extensions
 type Extensions struct {
-	Position   string      `json:"position"`   // Page
+	Position   int         `json:"position"`   // Page
 	MediaType  string      `json:"mediaType"`  // Attachment
 	FileSize   int         `json:"fileSize"`   // Attachment
 	Comment    string      `json:"comment"`    // Attachment
@@ -301,11 +304,11 @@ type Publishers struct {
 
 // Container contains basic container info
 type Container struct {
-	ID    string `json:"id"`
-	Key   string `json:"key"`   // Space
-	Name  string `json:"name"`  // Space
-	Title string `json:"title"` // Page or blogpost
-	Links *Links `json:"_links"`
+	CID   ContainerID `json:"id"`
+	Key   string      `json:"key"`   // Space
+	Name  string      `json:"name"`  // Space
+	Title string      `json:"title"` // Page or blogpost
+	Links *Links      `json:"_links"`
 }
 
 // LABELS //////////////////////////////////////////////////////////////////////////////
@@ -588,6 +591,11 @@ MAINLOOP:
 	return result
 }
 
+// ID return container ID
+func (c *Container) ID() string {
+	return string(c.CID)
+}
+
 // ////////////////////////////////////////////////////////////////////////////////// //
 
 // UnmarshalJSON is custom Date format unmarshaler
@@ -599,6 +607,20 @@ func (d *Date) UnmarshalJSON(b []byte) error {
 	return err
 }
 
+// UnmarshalJSON is custom container ID unmarshaler
+func (c *ContainerID) UnmarshalJSON(b []byte) error {
+	switch {
+	case len(b) == 0:
+		// nop
+	case b[0] == '"':
+		*c = ContainerID(strings.Replace(string(b), "\"", "", -1))
+	default:
+		*c = ContainerID(string(b))
+	}
+
+	return nil
+}
+
 // UnmarshalJSON is custom Timestamp format unmarshaler
 func (d *Timestamp) UnmarshalJSON(b []byte) error {
 	ts, err := strconv.ParseInt(string(b), 10, 64)
diff --git a/confluence.go b/confluence.go
index 975d9b6..5df23f4 100644
--- a/confluence.go
+++ b/confluence.go
@@ -830,7 +830,7 @@ func (api *API) acquireRequest(method, uri string, params Parameters) *fasthttp.
 	}
 
 	// Set auth header
-	req.Header.Set("Authorization", "Basic "+api.basicAuth)
+	req.Header.Add("Authorization", "Basic "+api.basicAuth)
 
 	return req
 }
diff --git a/confluence_test.go b/confluence_test.go
index 0269650..16f6416 100644
--- a/confluence_test.go
+++ b/confluence_test.go
@@ -37,7 +37,7 @@ func (s *ConfluenceSuite) TestParamsEncoding(c *C) {
 		Expand: []string{"test1,test2"},
 	}
 
-	c.Assert(p.ToQuery(), Equals, "expand=test1,test2")
+	c.Assert(p.ToQuery(), Equals, `expand=test1%2Ctest2`)
 
 	p = SpaceParameters{
 		SpaceKey:  []string{"TS1", "TS2", "TS3"},
diff --git a/utils.go b/utils.go
index cf38fb7..a448696 100644
--- a/utils.go
+++ b/utils.go
@@ -9,6 +9,7 @@ package confluence
 
 import (
 	"fmt"
+	"net/url"
 	"reflect"
 	"strings"
 	"time"
@@ -30,7 +31,7 @@ func paramsToQuery(params interface{}) string {
 		switch value.Type().String() {
 		case "string":
 			if value.String() != "" {
-				result += field.Tag.Get("query") + "=" + value.String() + "&"
+				result += field.Tag.Get("query") + "=" + esc(value.String()) + "&"
 			}
 
 		case "int":
@@ -77,9 +78,9 @@ func formatSlice(tag string, s reflect.Value) string {
 		v := s.Index(i)
 
 		if unwrap {
-			result += name + "=" + v.String() + "&"
+			result += name + "=" + esc(v.String()) + "&"
 		} else {
-			result += v.String() + ","
+			result += esc(v.String()) + ","
 		}
 	}
 
@@ -94,3 +95,8 @@ func parseSliceTag(tag string) (string, bool) {
 
 	return tag[:strings.Index(tag, ",")], true
 }
+
+// esc escapes the string so it can be safely placed inside a URL query
+func esc(s string) string {
+	return url.QueryEscape(s)
+}
diff --git a/version.go b/version.go
index 100da7e..9020ae4 100644
--- a/version.go
+++ b/version.go
@@ -12,7 +12,7 @@ const (
 	NAME = "Go-Confluence"
 
 	// VERSION is package version
-	VERSION = "1.3.0"
+	VERSION = "1.4.0"
 )
 
 // ////////////////////////////////////////////////////////////////////////////////// //