question: private Cursor queryRequestHeaders ( SQLiteDatabase db , Uri uri ) { String where = DownloadContract . RequestHeaders . COLUMN_DOWNLOAD_ID + "=" + getDownloadIdFromUri ( uri ) ; String [ ] projection = new String [ ] { DownloadContract . RequestHeaders . COLUMN_HEADER , DownloadContract . RequestHeaders . COLUMN_VALUE } ; return db . query ( DownloadContract . RequestHeaders . HEADERS_DB_TABLE , projection , where , null , null , null , null ) ; }
target:  Handle a query for the custom request headers registered for a download.