        throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="java.io中的类或接口">IOException</a></pre>
<div class="block">Peeks up to <code>byteCount</code> bytes from the response body and returns them as a new response
 body. If fewer than <code>byteCount</code> bytes are in the response body, the full response body is
 returned. If more than <code>byteCount</code> bytes are in the response body, the returned value
 will be truncated to <code>b