I am trying to figure out why I am getting gibberish in the post body of the following post request. The following request is from an IOS app. I get similar results from the Android app too.

I do not get any security errors on the app (on iOS or ANdroid version) and everything works while I am capturing traffic. Can the post body be encrypted? or is it most likely compressed? There is an unusual header "x-Accepts: compression" Is there anyway to convert the gibberish to something readable? The responses also look similar to the request post body

POST https://api.site.com/ HTTP/1.1
Host: api.site.com
x-auth-token: TOKEN
Content-Type: application/x-www-form-urlencoded
Connection: keep-alive
X-Accepts: compression
Accept: application/json
User-Agent: APP
Accept-Language: en-US;q=1, es-MX;q=0.9
Accept-Encoding: gzip, deflate
Content-Length: 89

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I suspect that it's binary data, having Content-Type: application/x-www-form-urlencoded also points to it being binary. Is my assumption likely? 

I also suspect that it's JSON converted to binary. Is there anyway to convert it back to something human readable?