Method readHeaders

CodenameOne/src/com/codename1/io/Util.java:2950–2965

(Object connection)

        final Wrapper<Long> result = new Wrapper<Long>(0l);
        ConnectionRequest cr = new GZConnectionRequest() {
            @Override
            protected void readHeaders(Object connection) throws IOException {
                String acceptRanges = getHeader(connection, "Accept-Ranges");
                if (checkPartialDownloadSupport && (acceptRanges == null || !"bytes".equals(acceptRanges))) {
                    // Log.p("The partial downloads of " + url + " are not supported.", Log.WARNING);
                    result.set(-2l);
                } else {
                    String contentLength = getHeader(connection, "Content-Length");
                    if (contentLength != null) {
                        result.set(Long.parseLong(contentLength));
                    } else {
                        // Log.p("The Content-Length of " + url + " is unknown.", Log.WARNING);
                        result.set(-1l);
                    }
                }
            }
        };
        cr.setUrl(url);
        cr.setHttpMethod("HEAD");