Enabling gzip compression on Azure App Service

Question

I have a web app hosted in microsoft azure. As local IIS uses compression for both static and dynamic content I expected this to work on azure platform as well. As it seems compression does not work as json and css files for example are returned uncompressed:

I have tried to set compression as mentioned in serveral posts (e.g. gzip compression in Windows Azure Websites or ) like this without any changes to the result:

<system.webServer>
    <urlCompression doStaticCompression="true" doDynamicCompression="true" />
  <httpCompression>
    <dynamicTypes>
    <clear />
    <add enabled="true" mimeType="text/*"/>
    <add enabled="true" mimeType="message/*"/>
    <add enabled="true" mimeType="application/x-javascript"/>
    <add enabled="true" mimeType="application/javascript"/>
    <add enabled="true" mimeType="application/json"/>
    <add enabled="false" mimeType="*/*"/>
    <add enabled="true" mimeType="application/atom+xml"/>
    <add enabled="true" mimeType="application/atom+xml;charset=utf-8"/>
  </dynamicTypes>
  <staticTypes>
    <clear />
    <add enabled="true" mimeType="text/*"/>
    <add enabled="true" mimeType="message/*"/>
    <add enabled="true" mimeType="application/javascript"/>
    <add enabled="true" mimeType="application/atom+xml"/>
    <add enabled="true" mimeType="application/xaml+xml"/>
    <add enabled="true" mimeType="application/json"/>
    <add enabled="false" mimeType="*/*"/>
  </staticTypes>
 </httpCompression>
[...]
</system.webServer>

As it seems the azure portal does not give me any option to change compression.

What do I need to do to enable compression or is it only possible when using a Vserver in azure?

Answer 1

You can change this in the web.config:

<system.webServer>
  <urlCompression doStaticCompression="true" doDynamicCompression="true" />
</system.webServer>

Then:

<httpCompression>
  <dynamicTypes>
    <clear />
    <add enabled="true"  mimeType="text/*"/>
    <add enabled="true"  mimeType="message/*"/>
    <add enabled="true"  mimeType="application/x-javascript"/>
    <add enabled="true"  mimeType="application/javascript"/>
    <add enabled="true"  mimeType="application/json"/>
    <add enabled="false" mimeType="*/*"/>
    <add enabled="true"  mimeType="application/atom+xml"/>
    <add enabled="true"  mimeType="application/atom+xml;charset=utf-8"/>
  </dynamicTypes>
  <staticTypes>
     <clear />
     <add enabled="true" mimeType="text/*"/>
     <add enabled="true" mimeType="message/*"/>
     <add enabled="true" mimeType="application/javascript"/>
     <add enabled="true" mimeType="application/atom+xml"/>
     <add enabled="true" mimeType="application/xaml+xml"/>
     <add enabled="true" mimeType="application/json"/>
     <add enabled="false" mimeType="*/*"/>
   </staticTypes>
 </httpCompression>

source: Microsoft forum