fix tests

Author: mozillazg

decode.go

@@ -250,5 +250,5 @@ func fillValues(sv reflect.Value, opts tagOptions, valArr []string) error {
 }
 
 func headerValues(h http.Header, key string) []string {
-return textproto.MIMEHeader(h).Values(key)
+return textproto.MIMEHeader(h)[textproto.CanonicalMIMEHeaderKey(key)]
 }

decode_test.go

@@ -3,6 +3,7 @@ package httpheader
 import (
 "fmt"
 "net/http"
+"net/textproto"
 "reflect"
 "regexp"
 "sort"
@@ -84,11 +85,11 @@ func TestDecodeHeader(t *testing.T) {
 type DecodedArgs []string
 
 func (m *DecodedArgs) DecodeHeader(header http.Header, tagKey string) error {
-baseKey := http.CanonicalHeaderKey(tagKey)
+baseKey := textproto.CanonicalMIMEHeaderKey(tagKey)
 keyMatch := regexp.MustCompile(fmt.Sprintf(`^%s\.\d+$`, baseKey))
 var args DecodedArgs
 for k := range header {
-if keyMatch.MatchString(http.CanonicalHeaderKey(k)) {
+if keyMatch.MatchString(textproto.CanonicalMIMEHeaderKey(k)) {
 args = append(args, header.Get(k))
 }
 }