Pruning a library with ProGuard

I am facing a dex limitation problem and I would like to avoid using multi-dex. I noticed that it okHttp

has a separate internal package for spdy

, and since my application is not using it, I am trying to remove it.

I added these two lines to proguard.cfg

:

-printusage usage.txt
-assumenosideeffects class com.squareup.okhttp.internal.spdy.*

      

        
        
        
      

    

After building my application, I can see in usage.txt

several classes and methods com.squareup.okhttp.internal.spdy

, but when I run the dexdump

script, I still get:

    okhttp: 1461
        internal: 978
            http: 233
            huc: 160
            io: 18
            spdy: 373
            tls: 19

      

        
        
        
      

    

Can anyone answer what could happen? Is there any other way to remove a package from a library?