<p></p>
<p dir="auto">now it worked, the following header was missing:<br>
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept</a></p>
<div class="highlight highlight-source-js"><pre><span class="pl-k">const</span> <span class="pl-s1">headers</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Headers</span><span class="pl-kos">(</span><span class="pl-kos">{</span>
      <span class="pl-c1">Authorization</span>: <span class="pl-s1">n</span><span class="pl-kos">,</span>
      <span class="pl-c1">Accept</span>: <span class="pl-s">"application/gpx+xml"</span><span class="pl-kos">,</span>
    <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">maybe it would be useful for other developers to store the information in the documentation of the api.</p>
<p dir="auto">thank you for your help.</p>

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