return ErrBodylessRequest on get method etc.

rest/httpx/requests.go

@@ -83,8 +83,13 @@ func ParseHeader(headerValue string) map[string]string {
 
 // Parses the post request which contains json in body.
 func ParseJsonBody(r *http.Request, v interface{}) error {
-	var reader io.Reader
+	switch r.Method {
+	case http.MethodDelete, http.MethodPatch, http.MethodPost, http.MethodPut:
+	default:
+		return ErrBodylessRequest
+	}
 
+	var reader io.Reader
 	if withJsonBody(r) {
 		reader = io.LimitReader(r.Body, maxBodyLen)
 	} else {