curl / libcurl / API / curl_easy_setopt / CURLOPT_ACCEPT_ENCODING



CURLOPT_ACCEPT_ENCODING - enables automatic decompression of HTTP downloads


#include <curl/curl.h>

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


Pass a char * argument specifying what encoding you'd 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 encodings you want in the response. Four 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 and (since curl 7.57.0) br which is brotli.

Set this option to NULL to explicitly disable it, which makes libcurl not send an Accept-Encoding: header and not decompress contents automatically.

You can also opt to just include the Accept-Encoding: header in your request with CURLOPT_HTTPHEADER 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.






CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "");
  /* enable all supported built-in compressions */
  curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
  /* Perform the request */


This option was called CURLOPT_ENCODING before 7.21.6


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



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