Preserve async stack traces of http requests

app/src/main/java/exh/util/ExceptionUtil.kt

@@ -4,4 +4,14 @@ inline fun <T> ignore(expr: () -> T): T? {
     return try { expr() } catch (t: Throwable) { null }
 }
 
+fun <T : Throwable> T.withRootCause(cause: Throwable): T {
+    val curCause = this.cause
 
+    if(curCause == null) {
+        this.initCause(cause)
+    } else {
+        curCause.withRootCause(cause)
+    }
+
+    return this
+}