create mini http client

http/response.go

@@ -0,0 +1,24 @@
+package http
+
+import (
+	"errors"
+)
+
+var (
+	ErrHeaderNotFound = errors.New("header not found")
+)
+
+type Response struct {
+	StatusCode int
+	Headers    []*Header
+	Body       []byte
+}
+
+func (r *Response) GetHeader(name string) (*Header, error) {
+	for _, h := range r.Headers {
+		if h.Name == name {
+			return h, nil
+		}
+	}
+	return nil, ErrHeaderNotFound
+}