private int getContentLength(Map<String, List<String>> headers)
    {
        try
        {
            return Integer.parseInt(headers.get("Content-Length").get(0));
        }
        catch (Exception e)
        {
            return -1;
        }
    }
private int getContentLength ( Map < String , List < String > > headers ) { try { return Integer . parseInt ( headers . get ( "Content-Length" ) . get ( 0 ) ) ; } catch ( Exception e ) { return - 1 ; } }
Get the value of "Content-Length" header.