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    java.lang.IllegalStateException: Already connected
        at java.net.URLConnection.checkNotConnected(URLConnection.java:464)
        at java.net.URLConnection.setUseCaches(URLConnection.java:946)
        at com.android.okhttp.internal.http.HttpsURLConnectionImpl.setUseCaches(HttpsURLConnectionImpl.java:298)
        at com.android.volley.toolbox.HurlStack.openConnection(HurlStack.java:191)
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