read token from config

pkg/realdebrid/api.go

@@ -81,10 +81,10 @@ func UnrestrictLink(accessToken, link string) (*UnrestrictResponse, error) {
 		return nil, err
 	}
 
-	if canFetchFirstByte(response.Download) {
-		return &response, nil
+	if !canFetchFirstByte(response.Download) {
+		return nil, fmt.Errorf("can't fetch first byte")
 	}
-	return nil, fmt.Errorf("can't fetch first byte")
+	return &response, nil
 }
 
 func canFetchFirstByte(url string) bool {
@@ -108,19 +108,14 @@ func canFetchFirstByte(url string) bool {
 	if resp.StatusCode == http.StatusPartialContent {
 		buffer := make([]byte, 1)
 		_, err := resp.Body.Read(buffer)
-		if err != nil {
-			return false
-		}
-		return true
+		return err == nil
 	}
 
 	// If server doesn't support partial content, try reading the first byte and immediately close
 	buffer := make([]byte, 1)
-	_, err = io.ReadFull(resp.Body, buffer)
-	if err != nil {
-		return false
-	}
-	return true
+	_, err = resp.Body.Read(buffer)
+	resp.Body.Close() // Close immediately after reading
+	return err == nil
 }
 
 // GetTorrents returns all torrents, paginated