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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH CURLOPT_ALTSVC_CTRL 3 "5 Feb 2019" "libcurl 7.64.1" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_ALTSVC_CTRL \- control alt-svc behavior
26 .SH SYNOPSIS
27 .nf
28 #include <curl/curl.h>
29
30 #define CURLALTSVC_IMMEDIATELY (1<<0)
31 #define CURLALTSVC_READONLYFILE (1<<2)
32 #define CURLALTSVC_H1 (1<<3)
33 #define CURLALTSVC_H2 (1<<4)
34 #define CURLALTSVC_H3 (1<<5)
35
36 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ALTSVC_CTRL, long bitmask);
37 .fi
38 .SH EXPERIMENTAL
39 Warning: this feature is early code and is marked as experimental. It can only
40 be enabled by explicitly telling configure with \fB--enable-alt-svc\fP. You are
41 advised to not ship this in production before the experimental label is
42 removed.
43 .SH DESCRIPTION
44 Populate the long \fIbitmask\fP with the correct set of features to instruct
45 libcurl how to handle Alt-Svc for the transfers using this handle.
46
47 libcurl will only accept Alt-Svc headers over a secure transport, meaning
48 HTTPS. It will also only complete a request to an alternative origin if that
49 origin is properly hosted over HTTPS. These requirements are there to make
50 sure both the source and the destination are legitimate.
51
52 Setting any bit will enable the alt-svc engine.
53 .IP "CURLALTSVC_IMMEDIATELY"
54 If an Alt-Svc: header is received, this instructs libcurl to switch to one of
55 those alternatives asap rather than to save it and use for the next
56 request. (Not currently supported).
57 .IP "CURLALTSVC_READONLYFILE"
58 Do not write the alt-svc cache back to the file specified with
59 \fICURLOPT_ALTSVC(3)\fP even if it gets updated. By default a file specified
60 with that option will be read and written to as deemed necessary.
61 .IP "CURLALTSVC_H1"
62 Accept alternative services offered over HTTP/1.1.
63 .IP "CURLALTSVC_H2"
64 Accept alternative services offered over HTTP/2. This will only be used if
65 libcurl was also built to actually support HTTP/2, otherwise this bit will be
66 ignored.
67 .IP "CURLALTSVC_H3"
68 Accept alternative services offered over HTTP/3. This will only be used if
69 libcurl was also built to actually support HTTP/3, otherwise this bit will be
70 ignored.
71 .SH DEFAULT
72 0. No Alt-Svc treatment.
73 .SH PROTOCOLS
74 HTTPS
75 .SH EXAMPLE
76 .nf
77 CURL *curl = curl_easy_init();
78 if(curl) {
79 curl_easy_setopt(curl, CURLOPT_ALTSVC_CTRL, CURLALTSVC_H1);
80 curl_easy_setopt(curl, CURLOPT_ALTSVC, "altsvc-cache.txt");
81 curl_easy_perform(curl);
82 }
83 .fi
84 .SH AVAILABILITY
85 Added in 7.64.1
86 .SH RETURN VALUE
87 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
88 .SH "SEE ALSO"
89 .BR CURLOPT_ALTSVC "(3), " CURLOPT_CONNECT_TO "(3), " CURLOPT_RESOLVE "(3), "