title: Single request to specific API stalled for long
body: <p>I've built up an API application with ASP.NET Core 2.2.</p>
  <p>Everything has been fine.  Except one <code>PATCH</code> API, which takes an ID and a list, to replace the list of corresponding item.</p>
  <p>This API <em>works fine with POSTMAN</em> too.  Simply and fast, works just as expected.</p>
  <p>However, to run on browsers, it stalls 1 minute to send that request.</p>
  <p>I've tried to make it simple by rewriting the App within only one jQuery function, to check if the problem is on my frontend app; however it still stalls for 1 minute.</p>
  <p>I've looked up <code>stalled</code>, people say that it can be a Chrome policy to load maximum 6 requests at the same time; however it's not my case.  There's only such request at that time, and every other API works fine except this one.</p>
  <p>Also, I've tried with other browsers: Firefox and Edge, but it's still the same.</p>
  <p>According to the article Chrome provides:</p>
  <blockquote>
  <ul>
  <li><strong>Queueing</strong>. The browser queues requests when:
  <ul>
  <li>There are higher priority requests.</li>
  <li>There are already six TCP connections open for this origin, which is the limit. Applies to HTTP/1.0 and &gt; HTTP/1.1 only.</li>
  <li>The browser is briefly allocating space in the disk cache</li>
  </ul>
  </li>
  <li><strong>Stalled</strong>. The request could be stalled for any of the reasons described in <strong>Queueing</strong>.</li>
  </ul>
  </blockquote>
  <p>It seems that getting &quot;stalled&quot; for long, means that the request wasn't event sent.  Does it mean that I can just exclude the possibility to fix backend API?</p>
  <p>And also, since that there's no other request at the same time, does it mean that it most likely goes to the reason that &quot;<em>The browser is briefly allocating space in the disk cache</em>&quot;, or is there any other reason?</p>
  <p>And I also wander why only this API gets this issue.  Is there anything special with the method &quot;<em>PATCH</em>&quot;?</p>