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curldown is this new file format for libcurl man pages. It is markdown inspired with differences: - Each file has a set of leading headers with meta-data - Supports a small subset of markdown - Uses .md file extensions for editors/IDE/GitHub to treat them nicely - Generates man pages very similar to the previous ones - Generates man pages that still convert nicely to HTML on the website - Detects and highlights mentions of curl symbols automatically (when their man page section is specified) tools: - cd2nroff: converts from curldown to nroff man page - nroff2cd: convert an (old) nroff man page to curldown - cdall: convert many nroff pages to curldown versions - cd2cd: verifies and updates a curldown to latest curldown This setup generates .3 versions of all the curldown versions at build time. CI: Since the documentation is now technically markdown in the eyes of many things, the CI runs many more tests and checks on this documentation, including proselint, link checkers and tests that make sure we capitalize the first letter after a period... Closes #12730
111 lines
3.4 KiB
Markdown
111 lines
3.4 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_ACCEPT_ENCODING
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HTTPHEADER (3)
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- CURLOPT_HTTP_CONTENT_DECODING (3)
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- CURLOPT_TRANSFER_ENCODING (3)
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---
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# NAME
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CURLOPT_ACCEPT_ENCODING - automatic decompression of HTTP downloads
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ACCEPT_ENCODING, char *enc);
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~~~
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# DESCRIPTION
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Pass a char pointer argument specifying what encoding you would like.
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Sets the contents of the Accept-Encoding: header sent in an HTTP request, and
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enables decoding of a response when a Content-Encoding: header is received.
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libcurl potentially supports several different compressed encodings depending
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on what support that has been built-in.
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To aid applications not having to bother about what specific algorithms this
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particular libcurl build supports, libcurl allows a zero-length string to be
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set ("") to ask for an Accept-Encoding: header to be used that contains all
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built-in supported encodings.
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Alternatively, you can specify exactly the encoding or list of encodings you
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want in the response. The following encodings are supported: *identity*,
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meaning non-compressed, *deflate* which requests the server to compress
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its response using the zlib algorithm, *gzip* which requests the gzip
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algorithm, (since curl 7.57.0) *br* which is brotli and (since curl
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7.72.0) *zstd* which is zstd. Provide them in the string as a
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comma-separated list of accepted encodings, like: **"br, gzip, deflate"**.
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Set CURLOPT_ACCEPT_ENCODING(3) to NULL to explicitly disable it, which
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makes libcurl not send an Accept-Encoding: header and not decompress received
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contents automatically.
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You can also opt to just include the Accept-Encoding: header in your request
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with CURLOPT_HTTPHEADER(3) but then there is no automatic decompressing
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when receiving data.
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This is a request, not an order; the server may or may not do it. This option
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must be set (to any non-NULL value) or else any unsolicited encoding done by
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the server is ignored.
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Servers might respond with Content-Encoding even without getting a
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Accept-Encoding: in the request. Servers might respond with a different
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Content-Encoding than what was asked for in the request.
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The Content-Length: servers send for a compressed response is supposed to
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indicate the length of the compressed content so when auto decoding is enabled
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it may not match the sum of bytes reported by the write callbacks (although,
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sending the length of the non-compressed content is a common server mistake).
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The application does not have to keep the string around after setting this
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option.
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# DEFAULT
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NULL
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# PROTOCOLS
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HTTP
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* enable all supported built-in compressions */
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curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
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/* Perform the request */
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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This option was called CURLOPT_ENCODING before 7.21.6
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The specific libcurl you are using must have been built with zlib to be able to
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decompress gzip and deflate responses, with the brotli library to
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decompress brotli responses and with the zstd library to decompress zstd
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responses.
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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