Issue 4916 - Request compression in CURL WebRequest.

src/DefaultWebRequestCurl.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 120 matching lines @@
 
   CURL *curl = curl_easy_init();
   if (curl)
   {
     std::stringstream responseText;
     HeaderData headerData;
     curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, ReceiveData);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &responseText);
+    // Request compressed data. Using any supported aglorithm
+    curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, ReceiveHeader);
     curl_easy_setopt(curl, CURLOPT_HEADERDATA, &headerData);
 
     struct curl_slist* headerList = 0;
     for (HeaderList::const_iterator it = requestHeaders.begin();
       it != requestHeaders.end(); ++it)
     {
       headerList = curl_slist_append(headerList, (it->first + ": " + it->second).c_str());
     }
     if (headerList)
@@ skipping 30 matching lines @@
         }
       }
     }
 
     if (headerList)
       curl_slist_free_all(headerList);
     curl_easy_cleanup(curl);
   }
   return result;
 }