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CURLOPT_ACCEPT_ENCODING

Section: curl_easy_setopt options (3)
Updated: December 21, 2016
Index Return to Main Contents

 

NAME

CURLOPT_ACCEPT_ENCODING - enables 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'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, meaning non-compressed, 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.

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(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, "http://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  

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_CONTENT_DECODING(3),


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO





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