Frida script - Peek http req/res

frida-hybrid-peek-android-okhttp.js

//Based on https://gist.github.com/materi/f5b95f798b9012e135e3462d52d33d4c
Java.perform(function() {
var res2 = Java.use('okhttp3.Response$Builder');
var Buffer = Java.use('okio.Buffer');
var peek_size = 1000
var String = Java.use('java.lang.String');
    res2.build.implementation = function() {

        var response = this.build();
        
        console.log("## REQ ### ");
        console.log(response.request());
        console.log(response.request().headers());
        var body = response.request().body()
        if (body != null) {
            var buffer = Buffer.$new();
            body.writeTo(buffer);
            console.log(decodeURIComponent(buffer.readUtf8().toString()));
        }

        console.log("## -REQ- ### ");
        console.log("## RESP ### ");
        console.log(response.headers())
        var rBody = response.body();
        if (rBody != null) {
            rBody = response.peekBody(peek_size)
            console.log(rBody.string())
        }
        console.log("## -RESP- ### ");
        
        return response;
    };

});

Tested with OkHttp version 4.9.2. Reading responses does not always work correctly, but it's good enough for me