.clean up the code

backend/http_headers.go

@@ -1,20 +0,0 @@
-package backend
-
-import (
-	"io"
-	"net/http"
-)
-
-const DefaultDownloaderUserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36"
-
-func NewRequestWithDefaultHeaders(method string, rawURL string, body io.Reader) (*http.Request, error) {
-	req, err := http.NewRequest(method, rawURL, body)
-	if err != nil {
-		return nil, err
-	}
-
-	req.Header.Set("User-Agent", DefaultDownloaderUserAgent)
-	req.Header.Set("Accept", "application/json, text/plain, */*")
-
-	return req, nil
-}