feat: add httpc.Parse (#1698)

rest/internal/encoding/parser.go

@@ -0,0 +1,27 @@
+package encoding
+
+import (
+	"net/http"
+	"net/textproto"
+
+	"github.com/zeromicro/go-zero/core/mapping"
+)
+
+const headerKey = "header"
+
+var headerUnmarshaler = mapping.NewUnmarshaler(headerKey, mapping.WithStringValues(),
+	mapping.WithCanonicalKeyFunc(textproto.CanonicalMIMEHeaderKey))
+
+// ParseHeaders parses the headers request.
+func ParseHeaders(header http.Header, v interface{}) error {
+	m := map[string]interface{}{}
+	for k, v := range header {
+		if len(v) == 1 {
+			m[k] = v[0]
+		} else {
+			m[k] = v
+		}
+	}
+
+	return headerUnmarshaler.Unmarshal(m, v)
+}