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&lt;p&gt;The reason for my problem was that I had two slashes at the beginning:&lt;/p&gt;
&lt;pre class="literal-block"&gt;
PATCH //node/3230?_format=json HTTP/1.1
&lt;/pre&gt;
&lt;p&gt;After removing one, it worked.&lt;/p&gt;
&lt;p&gt;The double slashes were redirected to a single slash, but the body was lost in the redirection.&lt;/p&gt;
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&lt;/pre&gt;&lt;/td&gt;&lt;td class="de1"&gt;&lt;pre class="de1"&gt;&lt;span class="br0"&gt;&amp;#123;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;type&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="br0"&gt;&amp;#91;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#123;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;target_id&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="st0"&gt;&amp;quot;event&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;,&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;target_type&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="st0"&gt;&amp;quot;node_type&amp;quot;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#125;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#93;&lt;/span&gt;&lt;span class="sy0"&gt;,&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; 
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;title&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="br0"&gt;&amp;#91;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#123;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;value&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="st0"&gt;&amp;quot;20. Arbeitstreffen!!&amp;quot;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#125;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="br0"&gt;&amp;#93;&lt;/span&gt;
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&lt;/pre&gt;&lt;/td&gt;&lt;td class="de1"&gt;&lt;pre class="de1"&gt;&lt;span class="br0"&gt;&amp;#123;&lt;/span&gt;
&amp;#160; &amp;#160; &amp;#160; &amp;#160; &lt;span class="st0"&gt;&amp;quot;message&amp;quot;&lt;/span&gt;&lt;span class="sy0"&gt;:&lt;/span&gt; &lt;span class="st0"&gt;&amp;quot;No entity content received.&amp;quot;&lt;/span&gt;
&lt;span class="br0"&gt;&amp;#125;&lt;/span&gt;&lt;/pre&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;&lt;/div&gt;
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