title: HttpMediaTypeNotSupportedException: Content type 'video/mp4' not supported. While uploading video reavtive Spring webflux via Postman
body: <p>I want to upload a video using the reactive paradigm.
  I am trying to create a Controller which will take Mono as @RequestPart and store it into MongoDb via reactive stream (Spring webflux).</p>
  <p>My controller looks like this:</p>
  <pre><code>@PostMapping(value = &quot;/add/react&quot;, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
  public Mono&lt;ResponseEntity&gt; upload(@RequestPart(name = &quot;file&quot;) Mono&lt;FilePart&gt;fileParts) throws Exception {
      return fileParts
              .flatMap(part -&gt; this.gridFsTemplate.store(part.content(), part.filename()))
              .map((id) -&gt; ok().body(Map.of(&quot;id&quot;, id.toHexString())));
  }
  </code></pre>
  <p>I am trying to add a Multipart file via Postman:
  <a href="https://i.stack.imgur.com/zBzM8.png" rel="nofollow noreferrer">enter image description here</a></p>
  <p>But in the end, I am receiving this message</p>
  <pre><code>2021-02-23 16:38:26.498  WARN 23456 --- [nio-8088-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'video/mp4' not supported]
  </code></pre>
  <p>Could you help me, please? I have searched google for 2 days and did not find anything.</p>