restructured the project to comply community guideline, for others check release note

internal/proxy/fields/headers.go

@@ -0,0 +1,19 @@
+package fields
+
+import (
+	"net/http"
+	"strings"
+
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+func ValidateHTTPHeaders(headers map[string]string) (http.Header, E.NestedError) {
+	h := make(http.Header)
+	for k, v := range headers {
+		vSplit := strings.Split(v, ",")
+		for _, header := range vSplit {
+			h.Add(k, strings.TrimSpace(header))
+		}
+	}
+	return h, nil
+}