CURLOPT_ACCEPT_ENCODING (3) - Linux Manuals
CURLOPT_ACCEPT_ENCODING: enables automatic decompression of HTTP downloads
NAMECURLOPT_ACCEPT_ENCODING - enables automatic decompression of HTTP downloads
DESCRIPTIONPass a char * argument specifying what encoding you'd like.
Sets the contents of the Accept-Encoding: header sent in a HTTP request, and enables decoding of a response when a Content-Encoding: header is received. Three encodings are supported: identity, which does nothing, deflate which requests the server to compress its response using the zlib algorithm, and gzip which requests the gzip algorithm.
If a zero-length string is set like "", then an Accept-Encoding: header containing all built-in supported encodings is sent.
You can also opt to just include the Accept-Encoding: header in your request with CURLOPT_HTTPHEADER(3) but then there will be no automatic decompressing when receiving data.
This is a request, not an order; the server may or may not do it. This option must be set (to any non-NULL value) or else any unsolicited encoding done by the server is ignored. See the special file lib/README.encoding for further details.