Hi everybody, I use libcurl with OpenSSL on Windows, mainly for http and https in several multi-threaded GUI apps, and most things work perfectly. I implemented async cancel functionality by using the progress callback, but that doesn't seem to work during the DNS lookup phase. I tested with a domain name that doesn't resolve and I don't get any progress callback calls and have to wait until the curl_easy_perform returns with a failure result, which can take a while. This is unfortunate as since these are GUI apps, the user commands, including that to cancel a lengthy http request, must be very responsive. Is there any simple way to implement the async cancel in this case - by using another callback for example? I saw that c-ares can be used for async dns lookup, but I'd rather not add yet another dependency to all the projects I already maintain. Besides, I couldn't find any info in the libcurl documentation on how to actually add c-ares support. I found this line in CMakeList.txt: option(CURL_USE_ARES "Set to ON to enable c-ares support" OFF) but I couldn't find any references to such as #ifdef CURL_USE_ARES in the libcurl source code. Please note that I use Visual Studio 2003 (v 7.1). BTW, I sent a link to be inserted in your directory of libcurl powered apps a while ago, but it was never listed. Are there any special requirements for that? Thanks, Adrian
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