mirror of
https://github.com/moparisthebest/curl
synced 2024-11-17 15:05:02 -05:00
107 lines
4.4 KiB
Groff
107 lines
4.4 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at https://curl.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLOPT_ACCEPT_ENCODING 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
|
|
.SH NAME
|
|
CURLOPT_ACCEPT_ENCODING \- enables automatic decompression of HTTP downloads
|
|
.SH SYNOPSIS
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ACCEPT_ENCODING, char *enc);
|
|
.SH DESCRIPTION
|
|
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: \fIidentity\fP, meaning
|
|
non-compressed, \fIdeflate\fP which requests the server to compress its
|
|
response using the zlib algorithm, \fIgzip\fP which requests the gzip
|
|
algorithm, (since curl 7.57.0) \fIbr\fP which is brotli and (since curl
|
|
7.72.0) \fIzstd\fP which is zstd. Provide them in the string as a
|
|
comma-separated list of accepted encodings, like:
|
|
|
|
"br, gzip, deflate".
|
|
|
|
Set \fICURLOPT_ACCEPT_ENCODING(3)\fP 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 \fICURLOPT_HTTPHEADER(3)\fP 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.
|
|
.SH DEFAULT
|
|
NULL
|
|
.SH PROTOCOLS
|
|
HTTP
|
|
.SH EXAMPLE
|
|
.nf
|
|
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);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
This option was called CURLOPT_ENCODING before 7.21.6
|
|
|
|
The specific libcurl you're 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.
|
|
.SH 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.
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_TRANSFER_ENCODING "(3), " CURLOPT_HTTPHEADER "(3), "
|
|
.BR CURLOPT_HTTP_CONTENT_DECODING "(3), "
|