Uncompress a gzip file from CURL, on php

Have you tried setting the header stating that you accept gzip encoding as follows?:

curl_setopt($rCurl, CURLOPT_HTTPHEADER, array('Accept-Encoding: gzip,deflate'));

Use gzdecode:

<?php
    $c = file_get_contents("http://torcache.com/" .
        "torrent/63ABC1435AA5CD48DCD866C6F7D5E80766034391.torrent");
    echo gzdecode($c);

gives

d8:announce42:http://tracker.openbittorrent.com/announce13:announce-listll42
...

Just tell cURL to decode the response automatically whenever it's gzipped

curl_setopt($ch,CURLOPT_ENCODING, '');

libcurl offers a feature that makes it decompress the contents automatically (if built with zlib).

See the CURLOPT_ACCEPT_ENCODING option: https://curl.haxx.se/libcurl/c/CURLOPT_ACCEPT_ENCODING.html

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