Refine Cloudflare challenges detection

app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt

@@ -111,7 +111,6 @@ private fun rethrowExactly(code: Int, headers: Headers, body: String, e: Throwab
 
     // Check bad response code
     if (code >= 400) {
-        Log.d(TAG, "Code: $code\nHeaders: $headers\nBody: $body")
         throw StatusCodeException(code)
     }
 

app/src/main/java/com/hippo/ehviewer/client/exception/CloudflareBypassException.kt

@@ -0,0 +1,3 @@
+package com.hippo.ehviewer.client.exception
+
+class CloudflareBypassException : EhException("Failed to bypass Cloudflare")