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CURLOPT_ACCEPT_ENCODING(3)

curl_easy_setopt options                            CURLOPT_ACCEPT_ENCODING(3)



NAME
       CURLOPT_ACCEPT_ENCODING - automatic decompression of HTTP downloads

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ACCEPT_ENCODING, char *enc);

DESCRIPTION
       Pass a char * argument specifying what encoding you would like.

       Sets  the  contents  of  the  Accept-Encoding:  header  sent in an HTTP
       request, and enables decoding of a response  when  a  Content-Encoding:
       header is received.

       libcurl  potentially  supports  several  different compressed encodings
       depending on what support that has been built-in.

       To aid applications not having to bother about what specific algorithms
       this  particular  libcurl  build supports, libcurl allows a zero-length
       string to be set ("") to ask for an Accept-Encoding: header to be  used
       that contains all built-in supported encodings.

       Alternatively,  you  can specify exactly the encoding or list of encod‐
       ings you want in the response. The following encodings  are  supported:
       identity,  meaning non-compressed, deflate which requests the server to
       compress its response using the zlib algorithm, gzip which requests the
       gzip  algorithm, (since curl 7.57.0) br which is brotli and (since curl
       7.72.0) zstd which is zstd. Provide them in the string as a comma-sepa‐
       rated list of accepted encodings, like: "br, gzip, deflate".

       Set  CURLOPT_ACCEPT_ENCODING(3) to NULL to explicitly disable it, which
       makes libcurl not send an Accept-Encoding: header  and  not  decompress
       received contents automatically.

       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.

       Servers  might  respond  with  Content-Encoding  even without getting a
       Accept-Encoding: in the request. Servers might respond with a different
       Content-Encoding than what was asked for in the request.

       The  Content-Length: servers send for a compressed response is supposed
       to indicate the length of the compressed content so when auto  decoding
       is  enabled  it  may  not  match the sum of bytes reported by the write
       callbacks (although, sending the length of the  non-compressed  content
       is a common server mistake).

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       NULL

PROTOCOLS
       HTTP

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

         /* enable all supported built-in compressions */
         curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");

         /* Perform the request */
         curl_easy_perform(curl);
       }

AVAILABILITY
       This option was called CURLOPT_ENCODING before 7.21.6

       The specific libcurl you are using must have been built with zlib to be
       able  to decompress gzip and deflate responses, with the brotli library
       to decompress brotli responses and with the zstd library to  decompress
       zstd responses.

RETURN VALUE
       Returns  CURLE_OK  if  the option is supported, CURLE_UNKNOWN_OPTION if
       not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_TRANSFER_ENCODING(3), CURLOPT_HTTPHEADER(3),  CURLOPT_HTTP_CON‐
       TENT_DECODING(3),



libcurl 7.86.0                September 28, 2022
                                                    CURLOPT_ACCEPT_ENCODING(3)
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