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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_TRAILERFUNCTION.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_TRAILERFUNCTION 3 "14 Aug 2018" "libcurl 7.64.0" "curl_easy_setopt options"
24 .SH NAME:
25 CURLOPT_TRAILERFUNCTION \- Set callback for sending trailing headers
26 .SH SYNOPSIS:
27 #include <curl.h>
28
29 int curl_trailer_callback(struct curl_slist ** list, void *userdata);
30
31 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERFUNCTION, curl_trailer_callback *func);
32 .SH DESCRIPTION:
33 Pass a pointer to a callback function.
34
35 This callback function will be called once right before sending the final
36 CR LF in an HTTP chunked transfer to fill a list of trailing headers to be
37 sent before finishing the HTTP transfer.
38
39 You can set the userdata argument with the CURLOPT_TRAILERDATA option.
40
41 The trailing headers included in the linked list must not be CRLF-terminated,
42 because libcurl will add the appropriate line termination characters after
43 each header item.
44
45 If you use curl_slist_append to add trailing headers to the curl_slist then
46 libcurl will duplicate the strings, and will free the curl_slist and the
47 duplicates once the trailers have been sent.
48
49 If one of the trailing headers is not formatted correctly
50 (i.e. HeaderName: headerdata) it will be ignored and an info message
51 will be emitted.
52
53 The return value can either be CURL_TRAILERFUNC_OK or CURL_TRAILERFUNC_ABORT
54 which would respectively instruct libcurl to either continue with sending the
55 trailers or to abort the request.
56
57 If you set this option to NULL, then the transfer proceeds as usual
58 without any interruptions.
59 .SH DEFAULT:
60 NULL
61 .SH PROTOCOLS:
62 HTTP
63 .SH EXAMPLE:
64 #include <curl/curl.h>
65
66 static int trailer_cb(struct curl_slist **tr, void *data)
67 {
68 /* libcurl will free the list */
69 tr = curl_slist_append(*tr, "My-super-awesome-trailer: trailer-stuff");
70 return CURL_TRAILERFUNC_OK;
71 }
72
73 CURL *curl = curl_easy_init();
74 if(curl) {
75 /* Set the URL of the request */
76 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
77 /* Now set it as a put */
78 curl_easy_setopt(curl, CURLOPT_PUT, 1L);
79
80 /* Assuming we have a function that will return the data to be pushed
81 Let that function be read_cb */
82 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_cb);
83
84 struct curl_slist *headers = NULL;
85 headers = curl_slist_append(headers, "Trailer: My-super-awsome-trailer");
86 res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
87
88 /* Set the trailers filling callback */
89 curl_easy_setopt(curl, CURLOPT_TRAILERFUNCTION, trailer_cb);
90
91 /* Perform the request, res will get the return code */
92 res = curl_easy_perform(curl);
93
94 curl_easy_cleanup(curl);
95
96 curl_slist_free_all(headers);
97 }
98 .SH AVAILABILITY:
99 This option was added in curl 7.64.0 and is present if HTTP support is enabled
100 .SH "SEE ALSO"
101 .BR CURLOPT_TRAILERDATA "(3), "