131 lines
3.4 KiB
Markdown
131 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_CUSTOMREQUEST
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Section: 3
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Source: libcurl
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See-also:
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- CURLINFO_EFFECTIVE_METHOD (3)
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- CURLOPT_HTTPHEADER (3)
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- CURLOPT_NOBODY (3)
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- CURLOPT_REQUEST_TARGET (3)
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---
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# NAME
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CURLOPT_CUSTOMREQUEST - custom request method
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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_CUSTOMREQUEST, char *method);
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~~~
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# DESCRIPTION
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Pass a pointer to a null-terminated string as parameter.
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When changing the request *method* by setting CURLOPT_CUSTOMREQUEST(3), you
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do not actually change how libcurl behaves or acts: you only change the actual
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string sent in the request.
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libcurl passes on the verbatim string in its request without any filter or
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other safe guards. That includes white space and control characters.
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Restore to the internal default by setting this to NULL.
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This option can be used to specify the request:
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## HTTP
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Instead of GET or HEAD when performing HTTP based requests. This is
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particularly useful, for example, for performing an HTTP DELETE request.
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For example:
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When you tell libcurl to do a HEAD request, but then specify a GET though a
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custom request libcurl still acts as if it sent a HEAD. To switch to a proper
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HEAD use CURLOPT_NOBODY(3), to switch to a proper POST use
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CURLOPT_POST(3) or CURLOPT_POSTFIELDS(3) and to switch to a proper
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GET use CURLOPT_HTTPGET(3).
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Many people have wrongly used this option to replace the entire request with
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their own, including multiple headers and POST contents. While that might work
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in many cases, it might cause libcurl to send invalid requests and it could
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possibly confuse the remote server badly. Use CURLOPT_POST(3) and
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CURLOPT_POSTFIELDS(3) to set POST data. Use CURLOPT_HTTPHEADER(3)
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to replace or extend the set of headers sent by libcurl. Use
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CURLOPT_HTTP_VERSION(3) to change HTTP version.
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## FTP
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Instead of LIST and NLST when performing FTP directory listings.
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## IMAP
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Instead of LIST when issuing IMAP based requests.
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## POP3
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Instead of LIST and RETR when issuing POP3 based requests.
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For example:
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When you tell libcurl to use a custom request it behaves like a LIST or RETR
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command was sent where it expects data to be returned by the server. As such
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CURLOPT_NOBODY(3) should be used when specifying commands such as
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**DELE** and **NOOP** for example.
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## SMTP
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Instead of a **HELP** or **VRFY** when issuing SMTP based requests.
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For example:
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Normally a multi line response is returned which can be used, in conjunction
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with CURLOPT_MAIL_RCPT(3), to specify an EXPN request. If the
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CURLOPT_NOBODY(3) option is specified then the request can be used to
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issue **NOOP** and **RSET** commands.
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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, FTP, IMAP, POP3 and SMTP
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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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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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/* DELETE the given path */
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curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "DELETE");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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IMAP is supported since 7.30.0, POP3 since 7.26.0 and SMTP since 7.34.0.
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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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