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23 .TH CURLOPT_HTTPHEADER 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
25 CURLOPT_HTTPHEADER \- set custom HTTP headers
27 #include <curl/curl.h>
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPHEADER, struct curl_slist *headers);
31 Pass a pointer to a linked list of HTTP headers to pass to the server and/or
32 proxy in your HTTP request. The same list can be used for both host and proxy
35 The linked list should be a fully valid list of \fBstruct curl_slist\fP
36 structs properly filled in. Use \fIcurl_slist_append(3)\fP to create the list
37 and \fIcurl_slist_free_all(3)\fP to clean up an entire list. If you add a
38 header that is otherwise generated and used by libcurl internally, your added
39 one will be used instead. If you add a header with no content as in 'Accept:'
40 (no data on the right side of the colon), the internally used header will get
41 disabled. With this option you can add new headers, replace internal headers
42 and remove internal headers. To add a header with no content (nothing to the
43 right side of the colon), use the form 'MyHeader;' (note the ending
46 The headers included in the linked list \fBmust not\fP be CRLF-terminated,
47 because libcurl adds CRLF after each header item. Failure to comply with this
48 will result in strange bugs because the server will most likely ignore part of
49 the headers you specified.
51 The first line in a request (containing the method, usually a GET or POST) is
52 not a header and cannot be replaced using this option. Only the lines
53 following the request-line are headers. Adding this method line in this list
54 of headers will only cause your request to send an invalid header. Use
55 \fICURLOPT_CUSTOMREQUEST(3)\fP to change the method.
57 When this option is passed to \fIcurl_easy_setopt(3)\fP, libcurl will not copy
58 the entire list so you \fBmust\fP keep it around until you no longer use this
59 \fIhandle\fP for a transfer before you call \fIcurl_slist_free_all(3)\fP on
62 Pass a NULL to this option to reset back to no custom headers.
64 The most commonly replaced headers have "shortcuts" in the options
65 \fICURLOPT_COOKIE(3)\fP, \fICURLOPT_USERAGENT(3)\fP and
66 \fICURLOPT_REFERER(3)\fP. We recommend using those.
68 There's an alternative option that sets or replaces headers only for requests
69 that are sent with CONNECT to a proxy: \fICURLOPT_PROXYHEADER(3)\fP. Use
70 \fICURLOPT_HEADEROPT(3)\fP to control the behavior.
72 By default, this option makes libcurl send the given headers in all HTTP
73 requests done by this handle. You should therefore use this option with
74 caution if you for example connect to the remote site using a proxy and a
75 CONNECT request, you should to consider if that proxy is supposed to also get
76 the headers. They may be private or otherwise sensitive to leak.
78 Use \fICURLOPT_HEADEROPT(3)\fP to make the headers only get sent to where you
79 intend them to get sent.
86 CURL *curl = curl_easy_init();
88 struct curl_slist *list = NULL;
91 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
93 list = curl_slist_append(list, "Shoesize: 10");
94 list = curl_slist_append(list, "Accept:");
96 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
98 curl_easy_perform(curl);
100 curl_slist_free_all(list); /* free the list again */
105 As long as HTTP is enabled
107 Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
109 .BR CURLOPT_CUSTOMREQUEST "(3), " CURLOPT_HEADEROPT "(3), "
110 .BR CURLOPT_PROXYHEADER "(3), " CURLOPT_HEADER "(3)"