Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3 @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_HEADERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_HEADERFUNCTION \- callback that receives header data
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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29 size_t header_callback(char *buffer,
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30 size_t size,
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31 size_t nitems,
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32 void *userdata);
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34 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERFUNCTION, header_callback);
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35 .SH DESCRIPTION
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36 Pass a pointer to your callback function, which should match the prototype
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37 shown above.
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39 This function gets called by libcurl as soon as it has received header
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40 data. The header callback will be called once for each header and only
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41 complete header lines are passed on to the callback. Parsing headers is very
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42 easy using this. The size of the data pointed to by \fIbuffer\fP is \fIsize\fP
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43 multiplied with \fInitems\fP. Do not assume that the header line is zero
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44 terminated!
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46 The pointer named \fIuserdata\fP is the one you set with the
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47 \fICURLOPT_HEADERDATA(3)\fP option.
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49 This callback function must return the number of bytes actually taken care of.
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50 If that amount differs from the amount passed in to your function, it'll signal
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51 an error to the library. This will cause the transfer to get aborted and the
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52 libcurl function in progress will return \fICURLE_WRITE_ERROR\fP.
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54 A complete HTTP header that is passed to this function can be up to
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55 \fICURL_MAX_HTTP_HEADER\fP (100K) bytes and includes the final line terminator.
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57 If this option is not set, or if it is set to NULL, but
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58 \fICURLOPT_HEADERDATA(3)\fP is set to anything but NULL, the function used to
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59 accept response data will be used instead. That is, it will be the function
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60 specified with \fICURLOPT_WRITEFUNCTION(3)\fP, or if it is not specified or
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61 NULL - the default, stream-writing function.
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63 It's important to note that the callback will be invoked for the headers of
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64 all responses received after initiating a request and not just the final
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65 response. This includes all responses which occur during authentication
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66 negotiation. If you need to operate on only the headers from the final
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67 response, you will need to collect headers in the callback yourself and use
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68 HTTP status lines, for example, to delimit response boundaries.
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69
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70 For an HTTP transfer, the status line and the blank line preceding the response
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71 body are both included as headers and passed to this function.
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73 When a server sends a chunked encoded transfer, it may contain a trailer. That
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74 trailer is identical to an HTTP header and if such a trailer is received it is
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75 passed to the application using this callback as well. There are several ways
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76 to detect it being a trailer and not an ordinary header: 1) it comes after the
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77 response-body. 2) it comes after the final header line (CR LF) 3) a Trailer:
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78 header among the regular response-headers mention what header(s) to expect in
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79 the trailer.
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80
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81 For non-HTTP protocols like FTP, POP3, IMAP and SMTP this function will get
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82 called with the server responses to the commands that libcurl sends.
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83 .SH LIMITATIONS
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84 libcurl does not unfold HTTP "folded headers" (deprecated since RFC 7230). A
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85 folded header is a header that continues on a subsequent line and starts with
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86 a whitespace. Such folds will be passed to the header callback as a separate
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87 one, although strictly it is just a continuation of the previous line.
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88 .SH DEFAULT
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89 Nothing.
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90 .SH PROTOCOLS
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91 Used for all protocols with headers or meta-data concept: HTTP, FTP, POP3,
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92 IMAP, SMTP and more.
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93 .SH EXAMPLE
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94 .nf
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95 static size_t header_callback(char *buffer, size_t size,
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96 size_t nitems, void *userdata)
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97 {
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98 /* received header is nitems * size long in 'buffer' NOT ZERO TERMINATED */
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99 /* 'userdata' is set with CURLOPT_HEADERDATA */
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100 return nitems * size;
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101 }
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102
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103 CURL *curl = curl_easy_init();
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104 if(curl) {
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105 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
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106
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107 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
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108
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109 curl_easy_perform(curl);
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110 }
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111 .fi
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112 .SH AVAILABILITY
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113 Always
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114 .SH RETURN VALUE
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115 Returns CURLE_OK
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116 .SH "SEE ALSO"
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117 .BR CURLOPT_HEADERDATA "(3), " CURLOPT_WRITEFUNCTION "(3), "