The gzip for azure functions app is enabled by default, is there any way to disable it?
I tried to edit the web.config file but there is no place to access the file system on the server.
You could edit urlCompression in the LocalSiteRoot/Config/applicationhost.config
via Kudu Debug console(CMD).
<system.webServer>
<urlCompression doStaticCompression="false" doDynamicCompression="false" />
</system.webServer>
Compression in IIS 7.x is configured with two .config file elements in the space. The elements can be set anywhere in the IIS/ASP.NET configuration pipeline all the way from ApplicationHost.config down to the local web.config file.
For more details, you could refer to this article.