@Override
    public int read(byte[] buffer) throws ProxyCacheException {
        if (inputStream == null) {
            throw new ProxyCacheException("Error reading data from " + sourceInfo.url + ": connection is absent!");
        }
        try {
            return inputStream.read(buffer, 0, buffer.length);
        } catch (InterruptedIOException e) {
            throw new InterruptedProxyCacheException("Reading source " + sourceInfo.url + " is interrupted", e);
        } catch (IOException e) {
            throw new ProxyCacheException("Error reading data from " + sourceInfo.url, e);
        }
    }
{@link Source} that uses http resource as source for {@link ProxyCache}.
VideoCache/src/main/java/com/yc/videocache/HttpUrlSource.java