title: spring webflux how get request body in webfilter?
body: <p>i want to get the request body in a webfilter.</p>
  
  <p>now, when the request body is to large,</p>
  
  <pre><code>final Flux&lt;DataBuffer&gt; body = exchange.getRequest().getBody();
  </code></pre>
  
  <p>this body has size 555,</p>
  
  <p>how to get the request body in the webfilter?</p>