GUACAMOLE-1060: Merge documentation for controlling Nginx upload size.

src/chapters/reverse-proxy.xml

@@ -217,6 +217,26 @@
     proxy_set_header Connection $http_connection;
     <emphasis>proxy_cookie_path /guacamole/ /<replaceable>new-path/</replaceable>;</emphasis>
     access_log off;
+}</programlisting>
+            </informalexample>
+        </section>
+        <section xml:id="nginx-file-upload-size">
+            <title>Adjusting file upload limits</title>
+            <para>When proxying Guacamole through Nginx, you may run into issues with the default
+                limitations that Nginx places on file uploads (1MB). The errors you receive can
+                be non-intuitive (permission denied, for example), but may be indicative of these
+                limits. The <code>client_max_body_size</code> parameter can be set within the
+                <code>location</code> block to configure the maximum file upload size:</para>
+            <informalexample>
+                <programlisting>location /guacamole/ {
+    proxy_pass http://<replaceable>HOSTNAME</replaceable>:<replaceable>8080</replaceable>/guacamole/;
+    proxy_buffering off;
+    proxy_http_version 1.1;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $http_connection;
+    <emphasis>client_max_body_size <replaceable>1g</replaceable>;</emphasis>
+    access_log off;
 }</programlisting>
             </informalexample>
         </section>